Spin density matrix elements in exclusive $$\omega $$ meson muoproduction
Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ and $$ \mu ^{-}$$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$$c^2...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Alexeev, G. D. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2021 |
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| Anmerkung: |
© The Author(s) 2021 |
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| Übergeordnetes Werk: |
Enthalten in: The European physical journal / C - Springer Berlin Heidelberg, 1998, 81(2021), 2 vom: Feb. |
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| Übergeordnetes Werk: |
volume:81 ; year:2021 ; number:2 ; month:02 |
| Links: |
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| DOI / URN: |
10.1140/epjc/s10052-020-08740-y |
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| Katalog-ID: |
OLC2123343021 |
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| 245 | 1 | 0 | |a Spin density matrix elements in exclusive $$\omega $$ meson muoproduction |
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| 520 | |a Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ and $$ \mu ^{-}$$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$$c^2$$$$< W<$$ 17.0 GeV/$$c^2$$, with the average kinematics $$\langle Q^{2} \rangle =$$ 2.1 (GeV/c)$$^2$$, $$\langle W \rangle = 7.6$$ GeV/$$c^2$$, and $$\langle p^{2}_{\mathrm{T}} \rangle = 0.16$$ (GeV/c)$$^2$$. Here, $$Q^2$$ denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and $$p_T$$ the transverse momentum of the $$\omega $$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons ($$\gamma ^*_T \rightarrow V_L$$) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive $$\omega $$ production. | ||
| 700 | 1 | |a Alexeev, M. G. |4 aut | |
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| 700 | 1 | |a Andrieux, V. |4 aut | |
| 700 | 1 | |a Anosov, V. |4 aut | |
| 700 | 1 | |a Antoshkin, A. |4 aut | |
| 700 | 1 | |a Augsten, K. |4 aut | |
| 700 | 1 | |a Augustyniak, W. |4 aut | |
| 700 | 1 | |a Azevedo, C. D. R. |4 aut | |
| 700 | 1 | |a Badełek, B. |4 aut | |
| 700 | 1 | |a Balestra, F. |4 aut | |
| 700 | 1 | |a Ball, M. |4 aut | |
| 700 | 1 | |a Barth, J. |4 aut | |
| 700 | 1 | |a Beck, R. |4 aut | |
| 700 | 1 | |a Bedfer, Y. |4 aut | |
| 700 | 1 | |a Antequera, J. Berenguer |4 aut | |
| 700 | 1 | |a Bernhard, J. |4 aut | |
| 700 | 1 | |a Bodlak, M. |4 aut | |
| 700 | 1 | |a Bradamante, F. |4 aut | |
| 700 | 1 | |a Bressan, A. |4 aut | |
| 700 | 1 | |a Burtsev, V. E. |4 aut | |
| 700 | 1 | |a Chang, W.-C. |4 aut | |
| 700 | 1 | |a Chatterjee, C. |4 aut | |
| 700 | 1 | |a Chiosso, M. |4 aut | |
| 700 | 1 | |a Chumakov, A. G. |4 aut | |
| 700 | 1 | |a Chung, S.-U. |4 aut | |
| 700 | 1 | |a Cicuttin, A. |4 aut | |
| 700 | 1 | |a Correia, P. M. M. |4 aut | |
| 700 | 1 | |a Crespo, M. L. |4 aut | |
| 700 | 1 | |a D’Ago, D. |4 aut | |
| 700 | 1 | |a Torre, S. Dalla |4 aut | |
| 700 | 1 | |a Dasgupta, S. S. |4 aut | |
| 700 | 1 | |a Dasgupta, S. |4 aut | |
| 700 | 1 | |a Denisenko, I. |4 aut | |
| 700 | 1 | |a Denisov, O. Yu. |4 aut | |
| 700 | 1 | |a Donskov, S. V. |4 aut | |
| 700 | 1 | |a Doshita, N. |4 aut | |
| 700 | 1 | |a Dreisbach, Ch. |4 aut | |
| 700 | 1 | |a Dünnweber, W. |4 aut | |
| 700 | 1 | |a Dusaev, R. R. |4 aut | |
| 700 | 1 | |a Efremov, A. |4 aut | |
| 700 | 1 | |a Eversheim, P. D. |4 aut | |
| 700 | 1 | |a Faccioli, P. |4 aut | |
| 700 | 1 | |a Faessler, M. |4 aut | |
| 700 | 1 | |a Ferrero, A. |4 aut | |
| 700 | 1 | |a Finger, M. |4 aut | |
| 700 | 1 | |a Finger, M. |4 aut | |
| 700 | 1 | |a Fischer, H. |4 aut | |
| 700 | 1 | |a Franco, C. |4 aut | |
| 700 | 1 | |a Friedrich, J. M. |4 aut | |
| 700 | 1 | |a Frolov, V. |4 aut | |
| 700 | 1 | |a Gautheron, F. |4 aut | |
| 700 | 1 | |a Gavrichtchouk, O. P. |4 aut | |
| 700 | 1 | |a Gerassimov, S. |4 aut | |
| 700 | 1 | |a Giarra, J. |4 aut | |
| 700 | 1 | |a Gnesi, I. |4 aut | |
| 700 | 1 | |a Gorzellik, M. |4 aut | |
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| 700 | 1 | |a Perdekamp, M. Grosse |4 aut | |
| 700 | 1 | |a Grube, B. |4 aut | |
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| 700 | 1 | |a von Harrach, D. |4 aut | |
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| 700 | 1 | |a Horikawa, N. |4 aut | |
| 700 | 1 | |a d’Hose, N. |4 aut | |
| 700 | 1 | |a Hsieh, C.-Y. |4 aut | |
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10.1140/epjc/s10052-020-08740-y doi (DE-627)OLC2123343021 (DE-He213)s10052-020-08740-y-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Alexeev, G. D. verfasserin aut Spin density matrix elements in exclusive $$\omega $$ meson muoproduction 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s) 2021 Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ and $$ \mu ^{-}$$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$$c^2$$$$< W<$$ 17.0 GeV/$$c^2$$, with the average kinematics $$\langle Q^{2} \rangle =$$ 2.1 (GeV/c)$$^2$$, $$\langle W \rangle = 7.6$$ GeV/$$c^2$$, and $$\langle p^{2}_{\mathrm{T}} \rangle = 0.16$$ (GeV/c)$$^2$$. Here, $$Q^2$$ denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and $$p_T$$ the transverse momentum of the $$\omega $$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons ($$\gamma ^*_T \rightarrow V_L$$) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive $$\omega $$ production. Alexeev, M. G. aut Amoroso, A. aut Andrieux, V. aut Anosov, V. aut Antoshkin, A. aut Augsten, K. aut Augustyniak, W. aut Azevedo, C. D. R. aut Badełek, B. aut Balestra, F. aut Ball, M. aut Barth, J. aut Beck, R. aut Bedfer, Y. aut Antequera, J. Berenguer aut Bernhard, J. aut Bodlak, M. aut Bradamante, F. aut Bressan, A. aut Burtsev, V. E. aut Chang, W.-C. aut Chatterjee, C. aut Chiosso, M. aut Chumakov, A. G. aut Chung, S.-U. aut Cicuttin, A. aut Correia, P. M. M. aut Crespo, M. L. aut D’Ago, D. aut Torre, S. Dalla aut Dasgupta, S. S. aut Dasgupta, S. aut Denisenko, I. aut Denisov, O. Yu. aut Donskov, S. V. aut Doshita, N. aut Dreisbach, Ch. aut Dünnweber, W. aut Dusaev, R. R. aut Efremov, A. aut Eversheim, P. D. aut Faccioli, P. aut Faessler, M. aut Ferrero, A. aut Finger, M. aut Finger, M. aut Fischer, H. aut Franco, C. aut Friedrich, J. M. aut Frolov, V. aut Gautheron, F. aut Gavrichtchouk, O. P. aut Gerassimov, S. aut Giarra, J. aut Gnesi, I. aut Gorzellik, M. aut Grasso, A. aut Gridin, A. aut Perdekamp, M. Grosse aut Grube, B. aut Guskov, A. aut von Harrach, D. aut Heitz, R. aut Herrmann, F. aut Horikawa, N. aut d’Hose, N. aut Hsieh, C.-Y. aut Huber, S. aut Ishimoto, S. aut Ivanov, A. aut Iwata, T. aut Jandek, M. aut Jary, V. aut Jörg, P. aut Joosten, R. aut Kabuß, E. aut Kaspar, F. aut Kerbizi, A. aut Ketzer, B. aut Khaustov, G. V. aut Khokhlov, Yu. A. aut Kisselev, Yu. aut Klein, F. aut Koivuniemi, J. H. aut Kolosov, V. N. aut Horikawa, K. Kondo aut Konorov, I. aut Konstantinov, V. F. aut Kotzinian, A. M. aut Kouznetsov, O. M. aut Koval, A. aut Kral, Z. aut Krinner, F. aut Kulinich, Y. aut Kunne, F. aut Kurek, K. aut Kurjata, R. P. aut Kveton, A. aut Lavickova, K. aut Levorato, S. aut Lian, Y.-S. aut Lichtenstadt, J. aut Lin, P.-J. aut Longo, R. aut Lyubovitskij, V. E. aut Maggiora, A. aut Magnon, A. aut Makins, N. aut Makke, N. aut Mallot, G. K. aut Maltsev, A. aut Mamon, S. A. aut Marianski, B. aut Martin, A. aut Marzec, J. aut Matoušek, J. aut Matsuda, T. aut Mattson, G. aut Meshcheryakov, G. V. aut Meyer, M. aut Meyer, W. aut Mikhailov, Yu. V. aut Mikhasenko, M. aut Mitrofanov, E. aut Mitrofanov, N. aut Miyachi, Y. aut Moretti, A. aut Nagaytsev, A. aut Naim, C. aut Neyret, D. aut Nový, J. aut Nowak, W.-D. aut Nukazuka, G. aut Nunes, A. S. aut Olshevsky, A. G. aut Ostrick, M. aut Panzieri, D. aut Parsamyan, B. aut Paul, S. aut Pekeler, H. aut Peng, J.-C. aut Pešek, M. aut Peshekhonov, D. V. aut Pešková, M. aut Pierre, N. aut Platchkov, S. aut Pochodzalla, J. aut Polyakov, V. A. aut Pretz, J. aut Quaresma, M. aut Quintans, C. aut Regali, C. aut Reicherz, G. aut Riedl, C. aut Rudnicki, T. aut Ryabchikov, D. I. aut Rybnikov, A. aut Rychter, A. aut Samoylenko, V. D. aut Sandacz, A. aut Sarkar, S. aut Savin, I. A. aut Sbrizzai, G. aut Schmieden, H. aut Selyunin, A. aut Sinha, L. aut Slunecka, M. aut Smolik, J. aut Srnka, A. aut Steffen, D. aut Stolarski, M. aut Subrt, O. aut Sulc, M. aut Suzuki, H. aut Szameitat, T. aut Sznajder, P. aut Tessaro, S. aut Tessarotto, F. (orcid)0000-0003-1327-1670 aut Thiel, A. aut Tomsa, J. aut Tosello, F. aut Townsend, A. aut Tskhay, V. aut Uhl, S. aut Vasilishin, B. I. aut Vauth, A. aut Veit, B. M. aut Veloso, J. aut Ventura, B. aut Vidon, A. aut Virius, M. aut Wagner, M. aut Wallner, S. aut Zaremba, K. aut Zavada, P. aut Zavertyaev, M. aut Zemko, M. aut Zemlyanichkina, E. aut Zhao, Y. aut Ziembicki, M. aut Enthalten in The European physical journal / C Springer Berlin Heidelberg, 1998 81(2021), 2 vom: Feb. (DE-627)235469777 (DE-600)1397769-6 (DE-576)061879150 1434-6044 nnns volume:81 year:2021 number:2 month:02 https://doi.org/10.1140/epjc/s10052-020-08740-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY AR 81 2021 2 02 |
| spelling |
10.1140/epjc/s10052-020-08740-y doi (DE-627)OLC2123343021 (DE-He213)s10052-020-08740-y-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Alexeev, G. D. verfasserin aut Spin density matrix elements in exclusive $$\omega $$ meson muoproduction 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s) 2021 Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ and $$ \mu ^{-}$$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$$c^2$$$$< W<$$ 17.0 GeV/$$c^2$$, with the average kinematics $$\langle Q^{2} \rangle =$$ 2.1 (GeV/c)$$^2$$, $$\langle W \rangle = 7.6$$ GeV/$$c^2$$, and $$\langle p^{2}_{\mathrm{T}} \rangle = 0.16$$ (GeV/c)$$^2$$. Here, $$Q^2$$ denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and $$p_T$$ the transverse momentum of the $$\omega $$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons ($$\gamma ^*_T \rightarrow V_L$$) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive $$\omega $$ production. Alexeev, M. G. aut Amoroso, A. aut Andrieux, V. aut Anosov, V. aut Antoshkin, A. aut Augsten, K. aut Augustyniak, W. aut Azevedo, C. D. R. aut Badełek, B. aut Balestra, F. aut Ball, M. aut Barth, J. aut Beck, R. aut Bedfer, Y. aut Antequera, J. Berenguer aut Bernhard, J. aut Bodlak, M. aut Bradamante, F. aut Bressan, A. aut Burtsev, V. E. aut Chang, W.-C. aut Chatterjee, C. aut Chiosso, M. aut Chumakov, A. G. aut Chung, S.-U. aut Cicuttin, A. aut Correia, P. M. M. aut Crespo, M. L. aut D’Ago, D. aut Torre, S. Dalla aut Dasgupta, S. S. aut Dasgupta, S. aut Denisenko, I. aut Denisov, O. Yu. aut Donskov, S. V. aut Doshita, N. aut Dreisbach, Ch. aut Dünnweber, W. aut Dusaev, R. R. aut Efremov, A. aut Eversheim, P. D. aut Faccioli, P. aut Faessler, M. aut Ferrero, A. aut Finger, M. aut Finger, M. aut Fischer, H. aut Franco, C. aut Friedrich, J. M. aut Frolov, V. aut Gautheron, F. aut Gavrichtchouk, O. P. aut Gerassimov, S. aut Giarra, J. aut Gnesi, I. aut Gorzellik, M. aut Grasso, A. aut Gridin, A. aut Perdekamp, M. Grosse aut Grube, B. aut Guskov, A. aut von Harrach, D. aut Heitz, R. aut Herrmann, F. aut Horikawa, N. aut d’Hose, N. aut Hsieh, C.-Y. aut Huber, S. aut Ishimoto, S. aut Ivanov, A. aut Iwata, T. aut Jandek, M. aut Jary, V. aut Jörg, P. aut Joosten, R. aut Kabuß, E. aut Kaspar, F. aut Kerbizi, A. aut Ketzer, B. aut Khaustov, G. V. aut Khokhlov, Yu. A. aut Kisselev, Yu. aut Klein, F. aut Koivuniemi, J. H. aut Kolosov, V. N. aut Horikawa, K. Kondo aut Konorov, I. aut Konstantinov, V. F. aut Kotzinian, A. M. aut Kouznetsov, O. M. aut Koval, A. aut Kral, Z. aut Krinner, F. aut Kulinich, Y. aut Kunne, F. aut Kurek, K. aut Kurjata, R. P. aut Kveton, A. aut Lavickova, K. aut Levorato, S. aut Lian, Y.-S. aut Lichtenstadt, J. aut Lin, P.-J. aut Longo, R. aut Lyubovitskij, V. E. aut Maggiora, A. aut Magnon, A. aut Makins, N. aut Makke, N. aut Mallot, G. K. aut Maltsev, A. aut Mamon, S. A. aut Marianski, B. aut Martin, A. aut Marzec, J. aut Matoušek, J. aut Matsuda, T. aut Mattson, G. aut Meshcheryakov, G. V. aut Meyer, M. aut Meyer, W. aut Mikhailov, Yu. V. aut Mikhasenko, M. aut Mitrofanov, E. aut Mitrofanov, N. aut Miyachi, Y. aut Moretti, A. aut Nagaytsev, A. aut Naim, C. aut Neyret, D. aut Nový, J. aut Nowak, W.-D. aut Nukazuka, G. aut Nunes, A. S. aut Olshevsky, A. G. aut Ostrick, M. aut Panzieri, D. aut Parsamyan, B. aut Paul, S. aut Pekeler, H. aut Peng, J.-C. aut Pešek, M. aut Peshekhonov, D. V. aut Pešková, M. aut Pierre, N. aut Platchkov, S. aut Pochodzalla, J. aut Polyakov, V. A. aut Pretz, J. aut Quaresma, M. aut Quintans, C. aut Regali, C. aut Reicherz, G. aut Riedl, C. aut Rudnicki, T. aut Ryabchikov, D. I. aut Rybnikov, A. aut Rychter, A. aut Samoylenko, V. D. aut Sandacz, A. aut Sarkar, S. aut Savin, I. A. aut Sbrizzai, G. aut Schmieden, H. aut Selyunin, A. aut Sinha, L. aut Slunecka, M. aut Smolik, J. aut Srnka, A. aut Steffen, D. aut Stolarski, M. aut Subrt, O. aut Sulc, M. aut Suzuki, H. aut Szameitat, T. aut Sznajder, P. aut Tessaro, S. aut Tessarotto, F. (orcid)0000-0003-1327-1670 aut Thiel, A. aut Tomsa, J. aut Tosello, F. aut Townsend, A. aut Tskhay, V. aut Uhl, S. aut Vasilishin, B. I. aut Vauth, A. aut Veit, B. M. aut Veloso, J. aut Ventura, B. aut Vidon, A. aut Virius, M. aut Wagner, M. aut Wallner, S. aut Zaremba, K. aut Zavada, P. aut Zavertyaev, M. aut Zemko, M. aut Zemlyanichkina, E. aut Zhao, Y. aut Ziembicki, M. aut Enthalten in The European physical journal / C Springer Berlin Heidelberg, 1998 81(2021), 2 vom: Feb. (DE-627)235469777 (DE-600)1397769-6 (DE-576)061879150 1434-6044 nnns volume:81 year:2021 number:2 month:02 https://doi.org/10.1140/epjc/s10052-020-08740-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY AR 81 2021 2 02 |
| allfields_unstemmed |
10.1140/epjc/s10052-020-08740-y doi (DE-627)OLC2123343021 (DE-He213)s10052-020-08740-y-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Alexeev, G. D. verfasserin aut Spin density matrix elements in exclusive $$\omega $$ meson muoproduction 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s) 2021 Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ and $$ \mu ^{-}$$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$$c^2$$$$< W<$$ 17.0 GeV/$$c^2$$, with the average kinematics $$\langle Q^{2} \rangle =$$ 2.1 (GeV/c)$$^2$$, $$\langle W \rangle = 7.6$$ GeV/$$c^2$$, and $$\langle p^{2}_{\mathrm{T}} \rangle = 0.16$$ (GeV/c)$$^2$$. Here, $$Q^2$$ denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and $$p_T$$ the transverse momentum of the $$\omega $$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons ($$\gamma ^*_T \rightarrow V_L$$) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive $$\omega $$ production. Alexeev, M. G. aut Amoroso, A. aut Andrieux, V. aut Anosov, V. aut Antoshkin, A. aut Augsten, K. aut Augustyniak, W. aut Azevedo, C. D. R. aut Badełek, B. aut Balestra, F. aut Ball, M. aut Barth, J. aut Beck, R. aut Bedfer, Y. aut Antequera, J. Berenguer aut Bernhard, J. aut Bodlak, M. aut Bradamante, F. aut Bressan, A. aut Burtsev, V. E. aut Chang, W.-C. aut Chatterjee, C. aut Chiosso, M. aut Chumakov, A. G. aut Chung, S.-U. aut Cicuttin, A. aut Correia, P. M. M. aut Crespo, M. L. aut D’Ago, D. aut Torre, S. Dalla aut Dasgupta, S. S. aut Dasgupta, S. aut Denisenko, I. aut Denisov, O. Yu. aut Donskov, S. V. aut Doshita, N. aut Dreisbach, Ch. aut Dünnweber, W. aut Dusaev, R. R. aut Efremov, A. aut Eversheim, P. D. aut Faccioli, P. aut Faessler, M. aut Ferrero, A. aut Finger, M. aut Finger, M. aut Fischer, H. aut Franco, C. aut Friedrich, J. M. aut Frolov, V. aut Gautheron, F. aut Gavrichtchouk, O. P. aut Gerassimov, S. aut Giarra, J. aut Gnesi, I. aut Gorzellik, M. aut Grasso, A. aut Gridin, A. aut Perdekamp, M. Grosse aut Grube, B. aut Guskov, A. aut von Harrach, D. aut Heitz, R. aut Herrmann, F. aut Horikawa, N. aut d’Hose, N. aut Hsieh, C.-Y. aut Huber, S. aut Ishimoto, S. aut Ivanov, A. aut Iwata, T. aut Jandek, M. aut Jary, V. aut Jörg, P. aut Joosten, R. aut Kabuß, E. aut Kaspar, F. aut Kerbizi, A. aut Ketzer, B. aut Khaustov, G. V. aut Khokhlov, Yu. A. aut Kisselev, Yu. aut Klein, F. aut Koivuniemi, J. H. aut Kolosov, V. N. aut Horikawa, K. Kondo aut Konorov, I. aut Konstantinov, V. F. aut Kotzinian, A. M. aut Kouznetsov, O. M. aut Koval, A. aut Kral, Z. aut Krinner, F. aut Kulinich, Y. aut Kunne, F. aut Kurek, K. aut Kurjata, R. P. aut Kveton, A. aut Lavickova, K. aut Levorato, S. aut Lian, Y.-S. aut Lichtenstadt, J. aut Lin, P.-J. aut Longo, R. aut Lyubovitskij, V. E. aut Maggiora, A. aut Magnon, A. aut Makins, N. aut Makke, N. aut Mallot, G. K. aut Maltsev, A. aut Mamon, S. A. aut Marianski, B. aut Martin, A. aut Marzec, J. aut Matoušek, J. aut Matsuda, T. aut Mattson, G. aut Meshcheryakov, G. V. aut Meyer, M. aut Meyer, W. aut Mikhailov, Yu. V. aut Mikhasenko, M. aut Mitrofanov, E. aut Mitrofanov, N. aut Miyachi, Y. aut Moretti, A. aut Nagaytsev, A. aut Naim, C. aut Neyret, D. aut Nový, J. aut Nowak, W.-D. aut Nukazuka, G. aut Nunes, A. S. aut Olshevsky, A. G. aut Ostrick, M. aut Panzieri, D. aut Parsamyan, B. aut Paul, S. aut Pekeler, H. aut Peng, J.-C. aut Pešek, M. aut Peshekhonov, D. V. aut Pešková, M. aut Pierre, N. aut Platchkov, S. aut Pochodzalla, J. aut Polyakov, V. A. aut Pretz, J. aut Quaresma, M. aut Quintans, C. aut Regali, C. aut Reicherz, G. aut Riedl, C. aut Rudnicki, T. aut Ryabchikov, D. I. aut Rybnikov, A. aut Rychter, A. aut Samoylenko, V. D. aut Sandacz, A. aut Sarkar, S. aut Savin, I. A. aut Sbrizzai, G. aut Schmieden, H. aut Selyunin, A. aut Sinha, L. aut Slunecka, M. aut Smolik, J. aut Srnka, A. aut Steffen, D. aut Stolarski, M. aut Subrt, O. aut Sulc, M. aut Suzuki, H. aut Szameitat, T. aut Sznajder, P. aut Tessaro, S. aut Tessarotto, F. (orcid)0000-0003-1327-1670 aut Thiel, A. aut Tomsa, J. aut Tosello, F. aut Townsend, A. aut Tskhay, V. aut Uhl, S. aut Vasilishin, B. I. aut Vauth, A. aut Veit, B. M. aut Veloso, J. aut Ventura, B. aut Vidon, A. aut Virius, M. aut Wagner, M. aut Wallner, S. aut Zaremba, K. aut Zavada, P. aut Zavertyaev, M. aut Zemko, M. aut Zemlyanichkina, E. aut Zhao, Y. aut Ziembicki, M. aut Enthalten in The European physical journal / C Springer Berlin Heidelberg, 1998 81(2021), 2 vom: Feb. (DE-627)235469777 (DE-600)1397769-6 (DE-576)061879150 1434-6044 nnns volume:81 year:2021 number:2 month:02 https://doi.org/10.1140/epjc/s10052-020-08740-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY AR 81 2021 2 02 |
| allfieldsGer |
10.1140/epjc/s10052-020-08740-y doi (DE-627)OLC2123343021 (DE-He213)s10052-020-08740-y-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Alexeev, G. D. verfasserin aut Spin density matrix elements in exclusive $$\omega $$ meson muoproduction 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s) 2021 Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ and $$ \mu ^{-}$$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$$c^2$$$$< W<$$ 17.0 GeV/$$c^2$$, with the average kinematics $$\langle Q^{2} \rangle =$$ 2.1 (GeV/c)$$^2$$, $$\langle W \rangle = 7.6$$ GeV/$$c^2$$, and $$\langle p^{2}_{\mathrm{T}} \rangle = 0.16$$ (GeV/c)$$^2$$. Here, $$Q^2$$ denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and $$p_T$$ the transverse momentum of the $$\omega $$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons ($$\gamma ^*_T \rightarrow V_L$$) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive $$\omega $$ production. Alexeev, M. G. aut Amoroso, A. aut Andrieux, V. aut Anosov, V. aut Antoshkin, A. aut Augsten, K. aut Augustyniak, W. aut Azevedo, C. D. R. aut Badełek, B. aut Balestra, F. aut Ball, M. aut Barth, J. aut Beck, R. aut Bedfer, Y. aut Antequera, J. Berenguer aut Bernhard, J. aut Bodlak, M. aut Bradamante, F. aut Bressan, A. aut Burtsev, V. E. aut Chang, W.-C. aut Chatterjee, C. aut Chiosso, M. aut Chumakov, A. G. aut Chung, S.-U. aut Cicuttin, A. aut Correia, P. M. M. aut Crespo, M. L. aut D’Ago, D. aut Torre, S. Dalla aut Dasgupta, S. S. aut Dasgupta, S. aut Denisenko, I. aut Denisov, O. Yu. aut Donskov, S. V. aut Doshita, N. aut Dreisbach, Ch. aut Dünnweber, W. aut Dusaev, R. R. aut Efremov, A. aut Eversheim, P. D. aut Faccioli, P. aut Faessler, M. aut Ferrero, A. aut Finger, M. aut Finger, M. aut Fischer, H. aut Franco, C. aut Friedrich, J. M. aut Frolov, V. aut Gautheron, F. aut Gavrichtchouk, O. P. aut Gerassimov, S. aut Giarra, J. aut Gnesi, I. aut Gorzellik, M. aut Grasso, A. aut Gridin, A. aut Perdekamp, M. Grosse aut Grube, B. aut Guskov, A. aut von Harrach, D. aut Heitz, R. aut Herrmann, F. aut Horikawa, N. aut d’Hose, N. aut Hsieh, C.-Y. aut Huber, S. aut Ishimoto, S. aut Ivanov, A. aut Iwata, T. aut Jandek, M. aut Jary, V. aut Jörg, P. aut Joosten, R. aut Kabuß, E. aut Kaspar, F. aut Kerbizi, A. aut Ketzer, B. aut Khaustov, G. V. aut Khokhlov, Yu. A. aut Kisselev, Yu. aut Klein, F. aut Koivuniemi, J. H. aut Kolosov, V. N. aut Horikawa, K. Kondo aut Konorov, I. aut Konstantinov, V. F. aut Kotzinian, A. M. aut Kouznetsov, O. M. aut Koval, A. aut Kral, Z. aut Krinner, F. aut Kulinich, Y. aut Kunne, F. aut Kurek, K. aut Kurjata, R. P. aut Kveton, A. aut Lavickova, K. aut Levorato, S. aut Lian, Y.-S. aut Lichtenstadt, J. aut Lin, P.-J. aut Longo, R. aut Lyubovitskij, V. E. aut Maggiora, A. aut Magnon, A. aut Makins, N. aut Makke, N. aut Mallot, G. K. aut Maltsev, A. aut Mamon, S. A. aut Marianski, B. aut Martin, A. aut Marzec, J. aut Matoušek, J. aut Matsuda, T. aut Mattson, G. aut Meshcheryakov, G. V. aut Meyer, M. aut Meyer, W. aut Mikhailov, Yu. V. aut Mikhasenko, M. aut Mitrofanov, E. aut Mitrofanov, N. aut Miyachi, Y. aut Moretti, A. aut Nagaytsev, A. aut Naim, C. aut Neyret, D. aut Nový, J. aut Nowak, W.-D. aut Nukazuka, G. aut Nunes, A. S. aut Olshevsky, A. G. aut Ostrick, M. aut Panzieri, D. aut Parsamyan, B. aut Paul, S. aut Pekeler, H. aut Peng, J.-C. aut Pešek, M. aut Peshekhonov, D. V. aut Pešková, M. aut Pierre, N. aut Platchkov, S. aut Pochodzalla, J. aut Polyakov, V. A. aut Pretz, J. aut Quaresma, M. aut Quintans, C. aut Regali, C. aut Reicherz, G. aut Riedl, C. aut Rudnicki, T. aut Ryabchikov, D. I. aut Rybnikov, A. aut Rychter, A. aut Samoylenko, V. D. aut Sandacz, A. aut Sarkar, S. aut Savin, I. A. aut Sbrizzai, G. aut Schmieden, H. aut Selyunin, A. aut Sinha, L. aut Slunecka, M. aut Smolik, J. aut Srnka, A. aut Steffen, D. aut Stolarski, M. aut Subrt, O. aut Sulc, M. aut Suzuki, H. aut Szameitat, T. aut Sznajder, P. aut Tessaro, S. aut Tessarotto, F. (orcid)0000-0003-1327-1670 aut Thiel, A. aut Tomsa, J. aut Tosello, F. aut Townsend, A. aut Tskhay, V. aut Uhl, S. aut Vasilishin, B. I. aut Vauth, A. aut Veit, B. M. aut Veloso, J. aut Ventura, B. aut Vidon, A. aut Virius, M. aut Wagner, M. aut Wallner, S. aut Zaremba, K. aut Zavada, P. aut Zavertyaev, M. aut Zemko, M. aut Zemlyanichkina, E. aut Zhao, Y. aut Ziembicki, M. aut Enthalten in The European physical journal / C Springer Berlin Heidelberg, 1998 81(2021), 2 vom: Feb. (DE-627)235469777 (DE-600)1397769-6 (DE-576)061879150 1434-6044 nnns volume:81 year:2021 number:2 month:02 https://doi.org/10.1140/epjc/s10052-020-08740-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY AR 81 2021 2 02 |
| allfieldsSound |
10.1140/epjc/s10052-020-08740-y doi (DE-627)OLC2123343021 (DE-He213)s10052-020-08740-y-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Alexeev, G. D. verfasserin aut Spin density matrix elements in exclusive $$\omega $$ meson muoproduction 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s) 2021 Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ and $$ \mu ^{-}$$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$$c^2$$$$< W<$$ 17.0 GeV/$$c^2$$, with the average kinematics $$\langle Q^{2} \rangle =$$ 2.1 (GeV/c)$$^2$$, $$\langle W \rangle = 7.6$$ GeV/$$c^2$$, and $$\langle p^{2}_{\mathrm{T}} \rangle = 0.16$$ (GeV/c)$$^2$$. Here, $$Q^2$$ denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and $$p_T$$ the transverse momentum of the $$\omega $$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons ($$\gamma ^*_T \rightarrow V_L$$) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive $$\omega $$ production. Alexeev, M. G. aut Amoroso, A. aut Andrieux, V. aut Anosov, V. aut Antoshkin, A. aut Augsten, K. aut Augustyniak, W. aut Azevedo, C. D. R. aut Badełek, B. aut Balestra, F. aut Ball, M. aut Barth, J. aut Beck, R. aut Bedfer, Y. aut Antequera, J. Berenguer aut Bernhard, J. aut Bodlak, M. aut Bradamante, F. aut Bressan, A. aut Burtsev, V. E. aut Chang, W.-C. aut Chatterjee, C. aut Chiosso, M. aut Chumakov, A. G. aut Chung, S.-U. aut Cicuttin, A. aut Correia, P. M. M. aut Crespo, M. L. aut D’Ago, D. aut Torre, S. Dalla aut Dasgupta, S. S. aut Dasgupta, S. aut Denisenko, I. aut Denisov, O. Yu. aut Donskov, S. V. aut Doshita, N. aut Dreisbach, Ch. aut Dünnweber, W. aut Dusaev, R. R. aut Efremov, A. aut Eversheim, P. D. aut Faccioli, P. aut Faessler, M. aut Ferrero, A. aut Finger, M. aut Finger, M. aut Fischer, H. aut Franco, C. aut Friedrich, J. M. aut Frolov, V. aut Gautheron, F. aut Gavrichtchouk, O. P. aut Gerassimov, S. aut Giarra, J. aut Gnesi, I. aut Gorzellik, M. aut Grasso, A. aut Gridin, A. aut Perdekamp, M. Grosse aut Grube, B. aut Guskov, A. aut von Harrach, D. aut Heitz, R. aut Herrmann, F. aut Horikawa, N. aut d’Hose, N. aut Hsieh, C.-Y. aut Huber, S. aut Ishimoto, S. aut Ivanov, A. aut Iwata, T. aut Jandek, M. aut Jary, V. aut Jörg, P. aut Joosten, R. aut Kabuß, E. aut Kaspar, F. aut Kerbizi, A. aut Ketzer, B. aut Khaustov, G. V. aut Khokhlov, Yu. A. aut Kisselev, Yu. aut Klein, F. aut Koivuniemi, J. H. aut Kolosov, V. N. aut Horikawa, K. Kondo aut Konorov, I. aut Konstantinov, V. F. aut Kotzinian, A. M. aut Kouznetsov, O. M. aut Koval, A. aut Kral, Z. aut Krinner, F. aut Kulinich, Y. aut Kunne, F. aut Kurek, K. aut Kurjata, R. P. aut Kveton, A. aut Lavickova, K. aut Levorato, S. aut Lian, Y.-S. aut Lichtenstadt, J. aut Lin, P.-J. aut Longo, R. aut Lyubovitskij, V. E. aut Maggiora, A. aut Magnon, A. aut Makins, N. aut Makke, N. aut Mallot, G. K. aut Maltsev, A. aut Mamon, S. A. aut Marianski, B. aut Martin, A. aut Marzec, J. aut Matoušek, J. aut Matsuda, T. aut Mattson, G. aut Meshcheryakov, G. V. aut Meyer, M. aut Meyer, W. aut Mikhailov, Yu. V. aut Mikhasenko, M. aut Mitrofanov, E. aut Mitrofanov, N. aut Miyachi, Y. aut Moretti, A. aut Nagaytsev, A. aut Naim, C. aut Neyret, D. aut Nový, J. aut Nowak, W.-D. aut Nukazuka, G. aut Nunes, A. S. aut Olshevsky, A. G. aut Ostrick, M. aut Panzieri, D. aut Parsamyan, B. aut Paul, S. aut Pekeler, H. aut Peng, J.-C. aut Pešek, M. aut Peshekhonov, D. V. aut Pešková, M. aut Pierre, N. aut Platchkov, S. aut Pochodzalla, J. aut Polyakov, V. A. aut Pretz, J. aut Quaresma, M. aut Quintans, C. aut Regali, C. aut Reicherz, G. aut Riedl, C. aut Rudnicki, T. aut Ryabchikov, D. I. aut Rybnikov, A. aut Rychter, A. aut Samoylenko, V. D. aut Sandacz, A. aut Sarkar, S. aut Savin, I. A. aut Sbrizzai, G. aut Schmieden, H. aut Selyunin, A. aut Sinha, L. aut Slunecka, M. aut Smolik, J. aut Srnka, A. aut Steffen, D. aut Stolarski, M. aut Subrt, O. aut Sulc, M. aut Suzuki, H. aut Szameitat, T. aut Sznajder, P. aut Tessaro, S. aut Tessarotto, F. (orcid)0000-0003-1327-1670 aut Thiel, A. aut Tomsa, J. aut Tosello, F. aut Townsend, A. aut Tskhay, V. aut Uhl, S. aut Vasilishin, B. I. aut Vauth, A. aut Veit, B. M. aut Veloso, J. aut Ventura, B. aut Vidon, A. aut Virius, M. aut Wagner, M. aut Wallner, S. aut Zaremba, K. aut Zavada, P. aut Zavertyaev, M. aut Zemko, M. aut Zemlyanichkina, E. aut Zhao, Y. aut Ziembicki, M. aut Enthalten in The European physical journal / C Springer Berlin Heidelberg, 1998 81(2021), 2 vom: Feb. (DE-627)235469777 (DE-600)1397769-6 (DE-576)061879150 1434-6044 nnns volume:81 year:2021 number:2 month:02 https://doi.org/10.1140/epjc/s10052-020-08740-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY AR 81 2021 2 02 |
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Alexeev, G. D. @@aut@@ Alexeev, M. G. @@aut@@ Amoroso, A. @@aut@@ Andrieux, V. @@aut@@ Anosov, V. @@aut@@ Antoshkin, A. @@aut@@ Augsten, K. @@aut@@ Augustyniak, W. @@aut@@ Azevedo, C. D. R. @@aut@@ Badełek, B. @@aut@@ Balestra, F. @@aut@@ Ball, M. @@aut@@ Barth, J. @@aut@@ Beck, R. @@aut@@ Bedfer, Y. @@aut@@ Antequera, J. Berenguer @@aut@@ Bernhard, J. @@aut@@ Bodlak, M. @@aut@@ Bradamante, F. @@aut@@ Bressan, A. @@aut@@ Burtsev, V. E. @@aut@@ Chang, W.-C. @@aut@@ Chatterjee, C. @@aut@@ Chiosso, M. @@aut@@ Chumakov, A. G. @@aut@@ Chung, S.-U. @@aut@@ Cicuttin, A. @@aut@@ Correia, P. M. M. @@aut@@ Crespo, M. L. @@aut@@ D’Ago, D. @@aut@@ Torre, S. Dalla @@aut@@ Dasgupta, S. S. @@aut@@ Dasgupta, S. @@aut@@ Denisenko, I. @@aut@@ Denisov, O. Yu. @@aut@@ Donskov, S. V. @@aut@@ Doshita, N. @@aut@@ Dreisbach, Ch. @@aut@@ Dünnweber, W. @@aut@@ Dusaev, R. R. @@aut@@ Efremov, A. @@aut@@ Eversheim, P. D. @@aut@@ Faccioli, P. @@aut@@ Faessler, M. @@aut@@ Ferrero, A. @@aut@@ Finger, M. @@aut@@ Fischer, H. @@aut@@ Franco, C. @@aut@@ Friedrich, J. M. @@aut@@ Frolov, V. @@aut@@ Gautheron, F. @@aut@@ Gavrichtchouk, O. P. @@aut@@ Gerassimov, S. @@aut@@ Giarra, J. @@aut@@ Gnesi, I. @@aut@@ Gorzellik, M. @@aut@@ Grasso, A. @@aut@@ Gridin, A. @@aut@@ Perdekamp, M. Grosse @@aut@@ Grube, B. @@aut@@ Guskov, A. @@aut@@ von Harrach, D. @@aut@@ Heitz, R. @@aut@@ Herrmann, F. @@aut@@ Horikawa, N. @@aut@@ d’Hose, N. @@aut@@ Hsieh, C.-Y. @@aut@@ Huber, S. @@aut@@ Ishimoto, S. @@aut@@ Ivanov, A. @@aut@@ Iwata, T. @@aut@@ Jandek, M. @@aut@@ Jary, V. @@aut@@ Jörg, P. @@aut@@ Joosten, R. @@aut@@ Kabuß, E. @@aut@@ Kaspar, F. @@aut@@ Kerbizi, A. @@aut@@ Ketzer, B. @@aut@@ Khaustov, G. V. @@aut@@ Khokhlov, Yu. A. @@aut@@ Kisselev, Yu. @@aut@@ Klein, F. @@aut@@ Koivuniemi, J. H. @@aut@@ Kolosov, V. N. @@aut@@ Horikawa, K. Kondo @@aut@@ Konorov, I. @@aut@@ Konstantinov, V. F. @@aut@@ Kotzinian, A. M. @@aut@@ Kouznetsov, O. M. @@aut@@ Koval, A. @@aut@@ Kral, Z. @@aut@@ Krinner, F. @@aut@@ Kulinich, Y. @@aut@@ Kunne, F. @@aut@@ Kurek, K. @@aut@@ Kurjata, R. P. @@aut@@ Kveton, A. @@aut@@ Lavickova, K. @@aut@@ Levorato, S. @@aut@@ Lian, Y.-S. @@aut@@ Lichtenstadt, J. @@aut@@ Lin, P.-J. @@aut@@ Longo, R. @@aut@@ Lyubovitskij, V. E. @@aut@@ Maggiora, A. @@aut@@ Magnon, A. @@aut@@ Makins, N. @@aut@@ Makke, N. @@aut@@ Mallot, G. K. @@aut@@ Maltsev, A. @@aut@@ Mamon, S. A. @@aut@@ Marianski, B. @@aut@@ Martin, A. @@aut@@ Marzec, J. @@aut@@ Matoušek, J. @@aut@@ Matsuda, T. @@aut@@ Mattson, G. @@aut@@ Meshcheryakov, G. V. @@aut@@ Meyer, M. @@aut@@ Meyer, W. @@aut@@ Mikhailov, Yu. V. @@aut@@ Mikhasenko, M. @@aut@@ Mitrofanov, E. @@aut@@ Mitrofanov, N. @@aut@@ Miyachi, Y. @@aut@@ Moretti, A. @@aut@@ Nagaytsev, A. @@aut@@ Naim, C. @@aut@@ Neyret, D. @@aut@@ Nový, J. @@aut@@ Nowak, W.-D. @@aut@@ Nukazuka, G. @@aut@@ Nunes, A. S. @@aut@@ Olshevsky, A. G. @@aut@@ Ostrick, M. @@aut@@ Panzieri, D. @@aut@@ Parsamyan, B. @@aut@@ Paul, S. @@aut@@ Pekeler, H. @@aut@@ Peng, J.-C. @@aut@@ Pešek, M. @@aut@@ Peshekhonov, D. V. @@aut@@ Pešková, M. @@aut@@ Pierre, N. @@aut@@ Platchkov, S. @@aut@@ Pochodzalla, J. @@aut@@ Polyakov, V. A. @@aut@@ Pretz, J. @@aut@@ Quaresma, M. @@aut@@ Quintans, C. @@aut@@ Regali, C. @@aut@@ Reicherz, G. @@aut@@ Riedl, C. @@aut@@ Rudnicki, T. @@aut@@ Ryabchikov, D. I. @@aut@@ Rybnikov, A. @@aut@@ Rychter, A. @@aut@@ Samoylenko, V. D. @@aut@@ Sandacz, A. @@aut@@ Sarkar, S. @@aut@@ Savin, I. A. @@aut@@ Sbrizzai, G. @@aut@@ Schmieden, H. @@aut@@ Selyunin, A. @@aut@@ Sinha, L. @@aut@@ Slunecka, M. @@aut@@ Smolik, J. @@aut@@ Srnka, A. @@aut@@ Steffen, D. @@aut@@ Stolarski, M. @@aut@@ Subrt, O. @@aut@@ Sulc, M. @@aut@@ Suzuki, H. @@aut@@ Szameitat, T. @@aut@@ Sznajder, P. @@aut@@ Tessaro, S. @@aut@@ Tessarotto, F. @@aut@@ Thiel, A. @@aut@@ Tomsa, J. @@aut@@ Tosello, F. @@aut@@ Townsend, A. @@aut@@ Tskhay, V. @@aut@@ Uhl, S. @@aut@@ Vasilishin, B. I. @@aut@@ Vauth, A. @@aut@@ Veit, B. M. @@aut@@ Veloso, J. @@aut@@ Ventura, B. @@aut@@ Vidon, A. @@aut@@ Virius, M. @@aut@@ Wagner, M. @@aut@@ Wallner, S. @@aut@@ Zaremba, K. @@aut@@ Zavada, P. @@aut@@ Zavertyaev, M. @@aut@@ Zemko, M. @@aut@@ Zemlyanichkina, E. @@aut@@ Zhao, Y. @@aut@@ Ziembicki, M. @@aut@@ |
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The measurement covers the range 5.0 GeV/$$c^2$$$$< W<$$ 17.0 GeV/$$c^2$$, with the average kinematics $$\langle Q^{2} \rangle =$$ 2.1 (GeV/c)$$^2$$, $$\langle W \rangle = 7.6$$ GeV/$$c^2$$, and $$\langle p^{2}_{\mathrm{T}} \rangle = 0.16$$ (GeV/c)$$^2$$. Here, $$Q^2$$ denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and $$p_T$$ the transverse momentum of the $$\omega $$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons ($$\gamma ^*_T \rightarrow V_L$$) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). 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Spin density matrix elements in exclusive $$\omega $$ meson muoproduction |
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Spin density matrix elements in exclusive $$\omega $$ meson muoproduction |
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Alexeev, G. D. |
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Alexeev, G. D. Alexeev, M. G. Amoroso, A. Andrieux, V. Anosov, V. Antoshkin, A. Augsten, K. Augustyniak, W. Azevedo, C. D. R. Badełek, B. Balestra, F. Ball, M. Barth, J. Beck, R. Bedfer, Y. Antequera, J. Berenguer Bernhard, J. Bodlak, M. Bradamante, F. Bressan, A. Burtsev, V. E. Chang, W.-C. Chatterjee, C. Chiosso, M. Chumakov, A. G. Chung, S.-U. Cicuttin, A. Correia, P. M. M. Crespo, M. L. D’Ago, D. Torre, S. Dalla Dasgupta, S. S. Dasgupta, S. Denisenko, I. Denisov, O. Yu. Donskov, S. V. Doshita, N. Dreisbach, Ch. Dünnweber, W. Dusaev, R. R. Efremov, A. Eversheim, P. D. Faccioli, P. Faessler, M. Ferrero, A. Finger, M. Fischer, H. Franco, C. Friedrich, J. M. Frolov, V. Gautheron, F. Gavrichtchouk, O. P. Gerassimov, S. Giarra, J. Gnesi, I. Gorzellik, M. Grasso, A. Gridin, A. Perdekamp, M. Grosse Grube, B. Guskov, A. von Harrach, D. Heitz, R. Herrmann, F. Horikawa, N. d’Hose, N. Hsieh, C.-Y. Huber, S. Ishimoto, S. Ivanov, A. Iwata, T. Jandek, M. Jary, V. Jörg, P. Joosten, R. Kabuß, E. Kaspar, F. Kerbizi, A. Ketzer, B. Khaustov, G. V. Khokhlov, Yu. A. Kisselev, Yu. Klein, F. Koivuniemi, J. H. Kolosov, V. N. Horikawa, K. Kondo Konorov, I. Konstantinov, V. F. Kotzinian, A. M. Kouznetsov, O. M. Koval, A. Kral, Z. Krinner, F. Kulinich, Y. Kunne, F. Kurek, K. Kurjata, R. P. Kveton, A. Lavickova, K. Levorato, S. Lian, Y.-S. Lichtenstadt, J. Lin, P.-J. Longo, R. Lyubovitskij, V. E. Maggiora, A. Magnon, A. Makins, N. Makke, N. Mallot, G. K. Maltsev, A. Mamon, S. A. Marianski, B. Martin, A. Marzec, J. Matoušek, J. Matsuda, T. Mattson, G. Meshcheryakov, G. V. Meyer, M. Meyer, W. Mikhailov, Yu. V. Mikhasenko, M. Mitrofanov, E. Mitrofanov, N. Miyachi, Y. Moretti, A. Nagaytsev, A. Naim, C. Neyret, D. Nový, J. Nowak, W.-D. Nukazuka, G. Nunes, A. S. Olshevsky, A. G. Ostrick, M. Panzieri, D. Parsamyan, B. Paul, S. Pekeler, H. Peng, J.-C. Pešek, M. Peshekhonov, D. V. Pešková, M. Pierre, N. Platchkov, S. Pochodzalla, J. Polyakov, V. A. Pretz, J. Quaresma, M. Quintans, C. Regali, C. Reicherz, G. Riedl, C. Rudnicki, T. Ryabchikov, D. I. Rybnikov, A. Rychter, A. Samoylenko, V. D. Sandacz, A. Sarkar, S. Savin, I. A. Sbrizzai, G. Schmieden, H. Selyunin, A. Sinha, L. Slunecka, M. Smolik, J. Srnka, A. Steffen, D. Stolarski, M. Subrt, O. Sulc, M. Suzuki, H. Szameitat, T. Sznajder, P. Tessaro, S. Tessarotto, F. Thiel, A. Tomsa, J. Tosello, F. Townsend, A. Tskhay, V. Uhl, S. Vasilishin, B. I. Vauth, A. Veit, B. M. Veloso, J. Ventura, B. Vidon, A. Virius, M. Wagner, M. Wallner, S. Zaremba, K. Zavada, P. Zavertyaev, M. Zemko, M. Zemlyanichkina, E. Zhao, Y. Ziembicki, M. |
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Alexeev, G. D. |
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spin density matrix elements in exclusive $$\omega $$ meson muoproduction |
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Spin density matrix elements in exclusive $$\omega $$ meson muoproduction |
| abstract |
Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ and $$ \mu ^{-}$$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$$c^2$$$$< W<$$ 17.0 GeV/$$c^2$$, with the average kinematics $$\langle Q^{2} \rangle =$$ 2.1 (GeV/c)$$^2$$, $$\langle W \rangle = 7.6$$ GeV/$$c^2$$, and $$\langle p^{2}_{\mathrm{T}} \rangle = 0.16$$ (GeV/c)$$^2$$. Here, $$Q^2$$ denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and $$p_T$$ the transverse momentum of the $$\omega $$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons ($$\gamma ^*_T \rightarrow V_L$$) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive $$\omega $$ production. © The Author(s) 2021 |
| abstractGer |
Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ and $$ \mu ^{-}$$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$$c^2$$$$< W<$$ 17.0 GeV/$$c^2$$, with the average kinematics $$\langle Q^{2} \rangle =$$ 2.1 (GeV/c)$$^2$$, $$\langle W \rangle = 7.6$$ GeV/$$c^2$$, and $$\langle p^{2}_{\mathrm{T}} \rangle = 0.16$$ (GeV/c)$$^2$$. Here, $$Q^2$$ denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and $$p_T$$ the transverse momentum of the $$\omega $$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons ($$\gamma ^*_T \rightarrow V_L$$) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive $$\omega $$ production. © The Author(s) 2021 |
| abstract_unstemmed |
Abstract We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\omega $$ meson muoproduction on the proton at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ and $$ \mu ^{-}$$ beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/$$c^2$$$$< W<$$ 17.0 GeV/$$c^2$$, with the average kinematics $$\langle Q^{2} \rangle =$$ 2.1 (GeV/c)$$^2$$, $$\langle W \rangle = 7.6$$ GeV/$$c^2$$, and $$\langle p^{2}_{\mathrm{T}} \rangle = 0.16$$ (GeV/c)$$^2$$. Here, $$Q^2$$ denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and $$p_T$$ the transverse momentum of the $$\omega $$ meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons ($$\gamma ^*_T \rightarrow V_L$$) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive $$\omega $$ production. © The Author(s) 2021 |
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Spin density matrix elements in exclusive $$\omega $$ meson muoproduction |
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https://doi.org/10.1140/epjc/s10052-020-08740-y |
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Alexeev, M. G. Amoroso, A. Andrieux, V. Anosov, V. Antoshkin, A. Augsten, K. Augustyniak, W. Azevedo, C. D. R. Badełek, B. Balestra, F. Ball, M. Barth, J. Beck, R. Bedfer, Y. Antequera, J. Berenguer Bernhard, J. Bodlak, M. Bradamante, F. Bressan, A. Burtsev, V. E. Chang, W.-C. Chatterjee, C. Chiosso, M. Chumakov, A. G. Chung, S.-U. Cicuttin, A. Correia, P. M. M. Crespo, M. L. D’Ago, D. Torre, S. Dalla Dasgupta, S. S. Dasgupta, S. Denisenko, I. Denisov, O. Yu Donskov, S. V. Doshita, N. Dreisbach, Ch Dünnweber, W. Dusaev, R. R. Efremov, A. Eversheim, P. D. Faccioli, P. Faessler, M. Ferrero, A. Finger, M. Fischer, H. Franco, C. Friedrich, J. M. Frolov, V. Gautheron, F. Gavrichtchouk, O. P. Gerassimov, S. Giarra, J. Gnesi, I. Gorzellik, M. Grasso, A. Gridin, A. Perdekamp, M. Grosse Grube, B. Guskov, A. von Harrach, D. Heitz, R. Herrmann, F. Horikawa, N. d’Hose, N. Hsieh, C.-Y. Huber, S. Ishimoto, S. Ivanov, A. Iwata, T. Jandek, M. Jary, V. Jörg, P. Joosten, R. Kabuß, E. Kaspar, F. Kerbizi, A. Ketzer, B. Khaustov, G. V. Khokhlov, Yu. A. Kisselev, Yu Klein, F. Koivuniemi, J. H. Kolosov, V. N. Horikawa, K. Kondo Konorov, I. Konstantinov, V. F. Kotzinian, A. M. Kouznetsov, O. M. Koval, A. Kral, Z. Krinner, F. Kulinich, Y. Kunne, F. Kurek, K. Kurjata, R. P. Kveton, A. Lavickova, K. Levorato, S. Lian, Y.-S. Lichtenstadt, J. Lin, P.-J. Longo, R. Lyubovitskij, V. E. Maggiora, A. Magnon, A. Makins, N. Makke, N. Mallot, G. K. Maltsev, A. Mamon, S. A. Marianski, B. Martin, A. Marzec, J. Matoušek, J. Matsuda, T. Mattson, G. Meshcheryakov, G. V. Meyer, M. Meyer, W. Mikhailov, Yu. V. Mikhasenko, M. Mitrofanov, E. Mitrofanov, N. Miyachi, Y. Moretti, A. Nagaytsev, A. Naim, C. Neyret, D. Nový, J. Nowak, W.-D. Nukazuka, G. Nunes, A. S. Olshevsky, A. G. Ostrick, M. Panzieri, D. Parsamyan, B. Paul, S. Pekeler, H. Peng, J.-C. Pešek, M. Peshekhonov, D. V. Pešková, M. Pierre, N. Platchkov, S. Pochodzalla, J. Polyakov, V. A. Pretz, J. Quaresma, M. Quintans, C. Regali, C. Reicherz, G. Riedl, C. Rudnicki, T. Ryabchikov, D. I. Rybnikov, A. Rychter, A. Samoylenko, V. D. Sandacz, A. Sarkar, S. Savin, I. A. Sbrizzai, G. Schmieden, H. Selyunin, A. Sinha, L. Slunecka, M. Smolik, J. Srnka, A. Steffen, D. Stolarski, M. Subrt, O. Sulc, M. Suzuki, H. Szameitat, T. Sznajder, P. Tessaro, S. Tessarotto, F. Thiel, A. Tomsa, J. Tosello, F. Townsend, A. Tskhay, V. Uhl, S. Vasilishin, B. I. Vauth, A. Veit, B. M. Veloso, J. Ventura, B. Vidon, A. Virius, M. Wagner, M. Wallner, S. Zaremba, K. Zavada, P. Zavertyaev, M. Zemko, M. Zemlyanichkina, E. Zhao, Y. Ziembicki, M. |
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Alexeev, M. G. Amoroso, A. Andrieux, V. Anosov, V. Antoshkin, A. Augsten, K. Augustyniak, W. Azevedo, C. D. R. Badełek, B. Balestra, F. Ball, M. Barth, J. Beck, R. Bedfer, Y. Antequera, J. Berenguer Bernhard, J. Bodlak, M. Bradamante, F. Bressan, A. Burtsev, V. E. Chang, W.-C. Chatterjee, C. Chiosso, M. Chumakov, A. G. Chung, S.-U. Cicuttin, A. Correia, P. M. M. Crespo, M. L. D’Ago, D. Torre, S. Dalla Dasgupta, S. S. Dasgupta, S. Denisenko, I. Denisov, O. Yu Donskov, S. V. Doshita, N. Dreisbach, Ch Dünnweber, W. Dusaev, R. R. Efremov, A. Eversheim, P. D. Faccioli, P. Faessler, M. Ferrero, A. Finger, M. Fischer, H. Franco, C. Friedrich, J. M. Frolov, V. Gautheron, F. Gavrichtchouk, O. P. Gerassimov, S. Giarra, J. Gnesi, I. Gorzellik, M. Grasso, A. Gridin, A. Perdekamp, M. Grosse Grube, B. Guskov, A. von Harrach, D. Heitz, R. Herrmann, F. Horikawa, N. d’Hose, N. Hsieh, C.-Y. Huber, S. Ishimoto, S. Ivanov, A. Iwata, T. Jandek, M. Jary, V. Jörg, P. Joosten, R. Kabuß, E. Kaspar, F. Kerbizi, A. Ketzer, B. Khaustov, G. V. Khokhlov, Yu. A. Kisselev, Yu Klein, F. Koivuniemi, J. H. Kolosov, V. N. Horikawa, K. Kondo Konorov, I. Konstantinov, V. F. Kotzinian, A. M. Kouznetsov, O. M. Koval, A. Kral, Z. Krinner, F. Kulinich, Y. Kunne, F. Kurek, K. Kurjata, R. P. Kveton, A. Lavickova, K. Levorato, S. Lian, Y.-S. Lichtenstadt, J. Lin, P.-J. Longo, R. Lyubovitskij, V. E. Maggiora, A. Magnon, A. Makins, N. Makke, N. Mallot, G. K. Maltsev, A. Mamon, S. A. Marianski, B. Martin, A. Marzec, J. Matoušek, J. Matsuda, T. Mattson, G. Meshcheryakov, G. V. Meyer, M. Meyer, W. Mikhailov, Yu. V. Mikhasenko, M. Mitrofanov, E. Mitrofanov, N. Miyachi, Y. Moretti, A. Nagaytsev, A. Naim, C. Neyret, D. Nový, J. Nowak, W.-D. Nukazuka, G. Nunes, A. S. Olshevsky, A. G. Ostrick, M. Panzieri, D. Parsamyan, B. Paul, S. Pekeler, H. Peng, J.-C. Pešek, M. Peshekhonov, D. V. Pešková, M. Pierre, N. Platchkov, S. Pochodzalla, J. Polyakov, V. A. Pretz, J. Quaresma, M. Quintans, C. Regali, C. Reicherz, G. Riedl, C. Rudnicki, T. Ryabchikov, D. I. Rybnikov, A. Rychter, A. Samoylenko, V. D. Sandacz, A. Sarkar, S. Savin, I. A. Sbrizzai, G. Schmieden, H. Selyunin, A. Sinha, L. Slunecka, M. Smolik, J. Srnka, A. Steffen, D. Stolarski, M. Subrt, O. Sulc, M. Suzuki, H. Szameitat, T. Sznajder, P. Tessaro, S. Tessarotto, F. Thiel, A. Tomsa, J. Tosello, F. Townsend, A. Tskhay, V. Uhl, S. Vasilishin, B. I. Vauth, A. Veit, B. M. Veloso, J. Ventura, B. Vidon, A. Virius, M. Wagner, M. Wallner, S. Zaremba, K. Zavada, P. Zavertyaev, M. Zemko, M. Zemlyanichkina, E. Zhao, Y. Ziembicki, M. |
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