Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-)
Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshol...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Ablikim, M [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2016 |
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| Systematik: |
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| Übergeordnetes Werk: |
Enthalten in: Physical review letters - Ridge, NY : American Physical Society, 1958, 117(2016), 4 |
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| Übergeordnetes Werk: |
volume:117 ; year:2016 ; number:4 |
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OLC1981137165 |
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| 245 | 1 | 0 | |a Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-) |
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| 520 | |a Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance. | ||
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PQ20161201 (DE-627)OLC1981137165 (DE-599)GBVOLC1981137165 (PRQ)s733-c622cdc0ec139cb7d564ff8cba7f88d0f9146db5e88f3ab173e43a8b85c935f0 (KEY)0009201020160000117000400000observationofananomalouslineshapeoftheetapipimasss DE-627 ger DE-627 rakwb eng 550 DNB UA 1000 AVZ rvk Ablikim, M verfasserin aut Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-) 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance. Achasov, M. N oth Ahmed, S oth Ai, X. C oth Albayrak, O oth Albrecht, M oth Ambrose, D. J oth Amoroso, A oth An, F. F oth An, Q oth Bai, J. Z oth Ferroli, R. Baldini oth Ban, Y oth Bennett, D. W oth Bennett, J. V oth Berger, N oth Bertani, M oth Bettoni, D oth Bian, J. M oth Bianchi, F oth Boger, E oth Boyko, I oth Briere, R. A oth Cai, H oth Cai, X oth Cakir, O oth Calcaterra, A oth Cao, G. F oth Cetin, S. A oth Chang, J. F oth Chelkov, G oth Chen, G oth Chen, H. S oth Chen, H. Y oth Chen, J. C oth Chen, M. L oth Chen, S oth Chen, S. J oth Chen, X oth Chen, X. R oth Chen, Y. B oth Cheng, H. P oth Chu, X. K oth Cibinetto, G oth Dai, H. L oth Dai, J. P oth Dbeyssi, A oth Dedovich, D oth Deng, Z. Y oth Denig, A oth Denysenko, I oth Destefanis, M oth De Mori, F oth Ding, Y oth Dong, C oth Dong, J oth Dong, L. Y oth Dong, M. Y oth Dou, Z. L oth Du, S. X oth Duan, P. F oth Fan, J. Z oth Fang, J oth Fang, S. S oth Fang, X oth Fang, Y oth Farinelli, R oth Fava, L oth Fedorov, O oth Feldbauer, F oth Felici, G oth Feng, C. Q oth Fioravanti, E oth Fritsch, M oth Fu, C. D oth Gao, Q oth Gao, X. L oth Gao, X. Y oth Gao, Y oth Gao, Z oth Garzia, I oth Goetzen, K oth Gong, L oth Gong, W. X oth Gradl, W oth Greco, M oth Gu, M. H oth Gu, Y. T oth Guan, Y. H oth Guo, A. Q oth Guo, L. B oth Guo, R. P oth Guo, Y oth Guo, Y. P oth Haddadi, Z oth Hafner, A oth Han, S oth Hao, X. Q oth Harris, F. A oth He, K. L oth ... oth Enthalten in Physical review letters Ridge, NY : American Physical Society, 1958 117(2016), 4 (DE-627)129503959 (DE-600)208853-8 (DE-576)014907267 0031-9007 nnns volume:117 year:2016 number:4 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-301422 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_47 GBV_ILN_55 GBV_ILN_59 GBV_ILN_60 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2004 GBV_ILN_2016 GBV_ILN_2095 GBV_ILN_2192 GBV_ILN_2279 GBV_ILN_2286 UA 1000 AR 117 2016 4 |
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PQ20161201 (DE-627)OLC1981137165 (DE-599)GBVOLC1981137165 (PRQ)s733-c622cdc0ec139cb7d564ff8cba7f88d0f9146db5e88f3ab173e43a8b85c935f0 (KEY)0009201020160000117000400000observationofananomalouslineshapeoftheetapipimasss DE-627 ger DE-627 rakwb eng 550 DNB UA 1000 AVZ rvk Ablikim, M verfasserin aut Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-) 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance. Achasov, M. N oth Ahmed, S oth Ai, X. C oth Albayrak, O oth Albrecht, M oth Ambrose, D. J oth Amoroso, A oth An, F. F oth An, Q oth Bai, J. Z oth Ferroli, R. Baldini oth Ban, Y oth Bennett, D. W oth Bennett, J. V oth Berger, N oth Bertani, M oth Bettoni, D oth Bian, J. M oth Bianchi, F oth Boger, E oth Boyko, I oth Briere, R. A oth Cai, H oth Cai, X oth Cakir, O oth Calcaterra, A oth Cao, G. F oth Cetin, S. A oth Chang, J. F oth Chelkov, G oth Chen, G oth Chen, H. S oth Chen, H. Y oth Chen, J. C oth Chen, M. L oth Chen, S oth Chen, S. J oth Chen, X oth Chen, X. R oth Chen, Y. B oth Cheng, H. P oth Chu, X. K oth Cibinetto, G oth Dai, H. L oth Dai, J. P oth Dbeyssi, A oth Dedovich, D oth Deng, Z. Y oth Denig, A oth Denysenko, I oth Destefanis, M oth De Mori, F oth Ding, Y oth Dong, C oth Dong, J oth Dong, L. Y oth Dong, M. Y oth Dou, Z. L oth Du, S. X oth Duan, P. F oth Fan, J. Z oth Fang, J oth Fang, S. S oth Fang, X oth Fang, Y oth Farinelli, R oth Fava, L oth Fedorov, O oth Feldbauer, F oth Felici, G oth Feng, C. Q oth Fioravanti, E oth Fritsch, M oth Fu, C. D oth Gao, Q oth Gao, X. L oth Gao, X. Y oth Gao, Y oth Gao, Z oth Garzia, I oth Goetzen, K oth Gong, L oth Gong, W. X oth Gradl, W oth Greco, M oth Gu, M. H oth Gu, Y. T oth Guan, Y. H oth Guo, A. Q oth Guo, L. B oth Guo, R. P oth Guo, Y oth Guo, Y. P oth Haddadi, Z oth Hafner, A oth Han, S oth Hao, X. Q oth Harris, F. A oth He, K. L oth ... oth Enthalten in Physical review letters Ridge, NY : American Physical Society, 1958 117(2016), 4 (DE-627)129503959 (DE-600)208853-8 (DE-576)014907267 0031-9007 nnns volume:117 year:2016 number:4 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-301422 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_47 GBV_ILN_55 GBV_ILN_59 GBV_ILN_60 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2004 GBV_ILN_2016 GBV_ILN_2095 GBV_ILN_2192 GBV_ILN_2279 GBV_ILN_2286 UA 1000 AR 117 2016 4 |
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PQ20161201 (DE-627)OLC1981137165 (DE-599)GBVOLC1981137165 (PRQ)s733-c622cdc0ec139cb7d564ff8cba7f88d0f9146db5e88f3ab173e43a8b85c935f0 (KEY)0009201020160000117000400000observationofananomalouslineshapeoftheetapipimasss DE-627 ger DE-627 rakwb eng 550 DNB UA 1000 AVZ rvk Ablikim, M verfasserin aut Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-) 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance. Achasov, M. N oth Ahmed, S oth Ai, X. C oth Albayrak, O oth Albrecht, M oth Ambrose, D. J oth Amoroso, A oth An, F. F oth An, Q oth Bai, J. Z oth Ferroli, R. Baldini oth Ban, Y oth Bennett, D. W oth Bennett, J. V oth Berger, N oth Bertani, M oth Bettoni, D oth Bian, J. M oth Bianchi, F oth Boger, E oth Boyko, I oth Briere, R. A oth Cai, H oth Cai, X oth Cakir, O oth Calcaterra, A oth Cao, G. F oth Cetin, S. A oth Chang, J. F oth Chelkov, G oth Chen, G oth Chen, H. S oth Chen, H. Y oth Chen, J. C oth Chen, M. L oth Chen, S oth Chen, S. J oth Chen, X oth Chen, X. R oth Chen, Y. B oth Cheng, H. P oth Chu, X. K oth Cibinetto, G oth Dai, H. L oth Dai, J. P oth Dbeyssi, A oth Dedovich, D oth Deng, Z. Y oth Denig, A oth Denysenko, I oth Destefanis, M oth De Mori, F oth Ding, Y oth Dong, C oth Dong, J oth Dong, L. Y oth Dong, M. Y oth Dou, Z. L oth Du, S. X oth Duan, P. F oth Fan, J. Z oth Fang, J oth Fang, S. S oth Fang, X oth Fang, Y oth Farinelli, R oth Fava, L oth Fedorov, O oth Feldbauer, F oth Felici, G oth Feng, C. Q oth Fioravanti, E oth Fritsch, M oth Fu, C. D oth Gao, Q oth Gao, X. L oth Gao, X. Y oth Gao, Y oth Gao, Z oth Garzia, I oth Goetzen, K oth Gong, L oth Gong, W. X oth Gradl, W oth Greco, M oth Gu, M. H oth Gu, Y. T oth Guan, Y. H oth Guo, A. Q oth Guo, L. B oth Guo, R. P oth Guo, Y oth Guo, Y. P oth Haddadi, Z oth Hafner, A oth Han, S oth Hao, X. Q oth Harris, F. A oth He, K. L oth ... oth Enthalten in Physical review letters Ridge, NY : American Physical Society, 1958 117(2016), 4 (DE-627)129503959 (DE-600)208853-8 (DE-576)014907267 0031-9007 nnns volume:117 year:2016 number:4 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-301422 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_47 GBV_ILN_55 GBV_ILN_59 GBV_ILN_60 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2004 GBV_ILN_2016 GBV_ILN_2095 GBV_ILN_2192 GBV_ILN_2279 GBV_ILN_2286 UA 1000 AR 117 2016 4 |
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PQ20161201 (DE-627)OLC1981137165 (DE-599)GBVOLC1981137165 (PRQ)s733-c622cdc0ec139cb7d564ff8cba7f88d0f9146db5e88f3ab173e43a8b85c935f0 (KEY)0009201020160000117000400000observationofananomalouslineshapeoftheetapipimasss DE-627 ger DE-627 rakwb eng 550 DNB UA 1000 AVZ rvk Ablikim, M verfasserin aut Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-) 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance. Achasov, M. N oth Ahmed, S oth Ai, X. C oth Albayrak, O oth Albrecht, M oth Ambrose, D. J oth Amoroso, A oth An, F. F oth An, Q oth Bai, J. Z oth Ferroli, R. Baldini oth Ban, Y oth Bennett, D. W oth Bennett, J. V oth Berger, N oth Bertani, M oth Bettoni, D oth Bian, J. M oth Bianchi, F oth Boger, E oth Boyko, I oth Briere, R. A oth Cai, H oth Cai, X oth Cakir, O oth Calcaterra, A oth Cao, G. F oth Cetin, S. A oth Chang, J. F oth Chelkov, G oth Chen, G oth Chen, H. S oth Chen, H. Y oth Chen, J. C oth Chen, M. L oth Chen, S oth Chen, S. J oth Chen, X oth Chen, X. R oth Chen, Y. B oth Cheng, H. P oth Chu, X. K oth Cibinetto, G oth Dai, H. L oth Dai, J. P oth Dbeyssi, A oth Dedovich, D oth Deng, Z. Y oth Denig, A oth Denysenko, I oth Destefanis, M oth De Mori, F oth Ding, Y oth Dong, C oth Dong, J oth Dong, L. Y oth Dong, M. Y oth Dou, Z. L oth Du, S. X oth Duan, P. F oth Fan, J. Z oth Fang, J oth Fang, S. S oth Fang, X oth Fang, Y oth Farinelli, R oth Fava, L oth Fedorov, O oth Feldbauer, F oth Felici, G oth Feng, C. Q oth Fioravanti, E oth Fritsch, M oth Fu, C. D oth Gao, Q oth Gao, X. L oth Gao, X. Y oth Gao, Y oth Gao, Z oth Garzia, I oth Goetzen, K oth Gong, L oth Gong, W. X oth Gradl, W oth Greco, M oth Gu, M. H oth Gu, Y. T oth Guan, Y. H oth Guo, A. Q oth Guo, L. B oth Guo, R. P oth Guo, Y oth Guo, Y. P oth Haddadi, Z oth Hafner, A oth Han, S oth Hao, X. Q oth Harris, F. A oth He, K. L oth ... oth Enthalten in Physical review letters Ridge, NY : American Physical Society, 1958 117(2016), 4 (DE-627)129503959 (DE-600)208853-8 (DE-576)014907267 0031-9007 nnns volume:117 year:2016 number:4 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-301422 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_47 GBV_ILN_55 GBV_ILN_59 GBV_ILN_60 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2004 GBV_ILN_2016 GBV_ILN_2095 GBV_ILN_2192 GBV_ILN_2279 GBV_ILN_2286 UA 1000 AR 117 2016 4 |
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PQ20161201 (DE-627)OLC1981137165 (DE-599)GBVOLC1981137165 (PRQ)s733-c622cdc0ec139cb7d564ff8cba7f88d0f9146db5e88f3ab173e43a8b85c935f0 (KEY)0009201020160000117000400000observationofananomalouslineshapeoftheetapipimasss DE-627 ger DE-627 rakwb eng 550 DNB UA 1000 AVZ rvk Ablikim, M verfasserin aut Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-) 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance. Achasov, M. N oth Ahmed, S oth Ai, X. C oth Albayrak, O oth Albrecht, M oth Ambrose, D. J oth Amoroso, A oth An, F. F oth An, Q oth Bai, J. Z oth Ferroli, R. Baldini oth Ban, Y oth Bennett, D. W oth Bennett, J. V oth Berger, N oth Bertani, M oth Bettoni, D oth Bian, J. M oth Bianchi, F oth Boger, E oth Boyko, I oth Briere, R. A oth Cai, H oth Cai, X oth Cakir, O oth Calcaterra, A oth Cao, G. F oth Cetin, S. A oth Chang, J. F oth Chelkov, G oth Chen, G oth Chen, H. S oth Chen, H. Y oth Chen, J. C oth Chen, M. L oth Chen, S oth Chen, S. J oth Chen, X oth Chen, X. R oth Chen, Y. B oth Cheng, H. P oth Chu, X. K oth Cibinetto, G oth Dai, H. L oth Dai, J. P oth Dbeyssi, A oth Dedovich, D oth Deng, Z. Y oth Denig, A oth Denysenko, I oth Destefanis, M oth De Mori, F oth Ding, Y oth Dong, C oth Dong, J oth Dong, L. Y oth Dong, M. Y oth Dou, Z. L oth Du, S. X oth Duan, P. F oth Fan, J. Z oth Fang, J oth Fang, S. S oth Fang, X oth Fang, Y oth Farinelli, R oth Fava, L oth Fedorov, O oth Feldbauer, F oth Felici, G oth Feng, C. Q oth Fioravanti, E oth Fritsch, M oth Fu, C. D oth Gao, Q oth Gao, X. L oth Gao, X. Y oth Gao, Y oth Gao, Z oth Garzia, I oth Goetzen, K oth Gong, L oth Gong, W. X oth Gradl, W oth Greco, M oth Gu, M. H oth Gu, Y. T oth Guan, Y. H oth Guo, A. Q oth Guo, L. B oth Guo, R. P oth Guo, Y oth Guo, Y. P oth Haddadi, Z oth Hafner, A oth Han, S oth Hao, X. Q oth Harris, F. A oth He, K. L oth ... oth Enthalten in Physical review letters Ridge, NY : American Physical Society, 1958 117(2016), 4 (DE-627)129503959 (DE-600)208853-8 (DE-576)014907267 0031-9007 nnns volume:117 year:2016 number:4 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-301422 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_21 GBV_ILN_22 GBV_ILN_40 GBV_ILN_47 GBV_ILN_55 GBV_ILN_59 GBV_ILN_60 GBV_ILN_70 GBV_ILN_130 GBV_ILN_2004 GBV_ILN_2016 GBV_ILN_2095 GBV_ILN_2192 GBV_ILN_2279 GBV_ILN_2286 UA 1000 AR 117 2016 4 |
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Ablikim, M @@aut@@ Achasov, M. N @@oth@@ Ahmed, S @@oth@@ Ai, X. C @@oth@@ Albayrak, O @@oth@@ Albrecht, M @@oth@@ Ambrose, D. J @@oth@@ Amoroso, A @@oth@@ An, F. F @@oth@@ An, Q @@oth@@ Bai, J. Z @@oth@@ Ferroli, R. Baldini @@oth@@ Ban, Y @@oth@@ Bennett, D. W @@oth@@ Bennett, J. V @@oth@@ Berger, N @@oth@@ Bertani, M @@oth@@ Bettoni, D @@oth@@ Bian, J. M @@oth@@ Bianchi, F @@oth@@ Boger, E @@oth@@ Boyko, I @@oth@@ Briere, R. A @@oth@@ Cai, H @@oth@@ Cai, X @@oth@@ Cakir, O @@oth@@ Calcaterra, A @@oth@@ Cao, G. F @@oth@@ Cetin, S. A @@oth@@ Chang, J. F @@oth@@ Chelkov, G @@oth@@ Chen, G @@oth@@ Chen, H. S @@oth@@ Chen, H. Y @@oth@@ Chen, J. C @@oth@@ Chen, M. L @@oth@@ Chen, S @@oth@@ Chen, S. J @@oth@@ Chen, X @@oth@@ Chen, X. R @@oth@@ Chen, Y. B @@oth@@ Cheng, H. P @@oth@@ Chu, X. K @@oth@@ Cibinetto, G @@oth@@ Dai, H. L @@oth@@ Dai, J. P @@oth@@ Dbeyssi, A @@oth@@ Dedovich, D @@oth@@ Deng, Z. Y @@oth@@ Denig, A @@oth@@ Denysenko, I @@oth@@ Destefanis, M @@oth@@ De Mori, F @@oth@@ Ding, Y @@oth@@ Dong, C @@oth@@ Dong, J @@oth@@ Dong, L. Y @@oth@@ Dong, M. Y @@oth@@ Dou, Z. L @@oth@@ Du, S. X @@oth@@ Duan, P. F @@oth@@ Fan, J. Z @@oth@@ Fang, J @@oth@@ Fang, S. S @@oth@@ Fang, X @@oth@@ Fang, Y @@oth@@ Farinelli, R @@oth@@ Fava, L @@oth@@ Fedorov, O @@oth@@ Feldbauer, F @@oth@@ Felici, G @@oth@@ Feng, C. Q @@oth@@ Fioravanti, E @@oth@@ Fritsch, M @@oth@@ Fu, C. D @@oth@@ Gao, Q @@oth@@ Gao, X. L @@oth@@ Gao, X. Y @@oth@@ Gao, Y @@oth@@ Gao, Z @@oth@@ Garzia, I @@oth@@ Goetzen, K @@oth@@ Gong, L @@oth@@ Gong, W. X @@oth@@ Gradl, W @@oth@@ Greco, M @@oth@@ Gu, M. H @@oth@@ Gu, Y. T @@oth@@ Guan, Y. H @@oth@@ Guo, A. Q @@oth@@ Guo, L. B @@oth@@ Guo, R. P @@oth@@ Guo, Y @@oth@@ Guo, Y. P @@oth@@ Haddadi, Z @@oth@@ Hafner, A @@oth@@ Han, S @@oth@@ Hao, X. Q @@oth@@ Harris, F. A @@oth@@ He, K. L @@oth@@ ... @@oth@@ |
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550 DNB UA 1000 AVZ rvk Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-) |
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Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-) |
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Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-) |
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observation of an anomalous line shape of the eta 'pi(+)pi(-) mass spectrum near the p(p)over-bar mass threshold in j/psi -> gamma eta 'pi(+)pi(-) |
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Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-) |
| abstract |
Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance. |
| abstractGer |
Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance. |
| abstract_unstemmed |
Using 1.09 x 10(9) J/psi events collected by the BESIII experiment in 2012, we study the J / psi -> gamma eta'pi(+)pi(-) process and observe a significant abrupt change in the slope of the eta'pi(+)pi(-) invariant mass distribution at the proton-antiproton (p (p) over bar) mass threshold. We use two models to characterize the eta'pi(+)pi(-) line shape around 1.85 GeV/c(2): one that explicitly incorporates the opening of a decay threshold in the mass spectrum (Flatte formula), and another that is the coherent sum of two resonant amplitudes. Both fits show almost equally good agreement with data, and suggest the existence of either a broad state around 1.85 GeV/c(2) with strong couplings to the c final states or a narrow state just below the p (p) over bar mass threshold. Although we cannot distinguish between the fits, either one supports the existence of a p (p) over bar moleculelike state or bound state with greater than 7 sigma significance. |
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Observation of an Anomalous Line Shape of the eta 'pi(+)pi(-) Mass Spectrum near the p(p)over-bar Mass Threshold in J/psi -> gamma eta 'pi(+)pi(-) |
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Achasov, M. N Ahmed, S Ai, X. C Albayrak, O Albrecht, M Ambrose, D. J Amoroso, A An, F. F An, Q Bai, J. Z Ferroli, R. Baldini Ban, Y Bennett, D. W Bennett, J. V Berger, N Bertani, M Bettoni, D Bian, J. M Bianchi, F Boger, E Boyko, I Briere, R. A Cai, H Cai, X Cakir, O Calcaterra, A Cao, G. F Cetin, S. A Chang, J. F Chelkov, G Chen, G Chen, H. S Chen, H. Y Chen, J. C Chen, M. L Chen, S Chen, S. J Chen, X Chen, X. R Chen, Y. B Cheng, H. P Chu, X. K Cibinetto, G Dai, H. L Dai, J. P Dbeyssi, A Dedovich, D Deng, Z. Y Denig, A Denysenko, I Destefanis, M De Mori, F Ding, Y Dong, C Dong, J Dong, L. Y Dong, M. Y Dou, Z. L Du, S. X Duan, P. F Fan, J. Z Fang, J Fang, S. S Fang, X Fang, Y Farinelli, R Fava, L Fedorov, O Feldbauer, F Felici, G Feng, C. Q Fioravanti, E Fritsch, M Fu, C. D Gao, Q Gao, X. L Gao, X. Y Gao, Y Gao, Z Garzia, I Goetzen, K Gong, L Gong, W. X Gradl, W Greco, M Gu, M. H Gu, Y. T Guan, Y. H Guo, A. Q Guo, L. B Guo, R. P Guo, Y Guo, Y. P Haddadi, Z Hafner, A Han, S Hao, X. Q Harris, F. A He, K. L . |
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Achasov, M. N Ahmed, S Ai, X. C Albayrak, O Albrecht, M Ambrose, D. J Amoroso, A An, F. F An, Q Bai, J. Z Ferroli, R. Baldini Ban, Y Bennett, D. W Bennett, J. V Berger, N Bertani, M Bettoni, D Bian, J. M Bianchi, F Boger, E Boyko, I Briere, R. A Cai, H Cai, X Cakir, O Calcaterra, A Cao, G. F Cetin, S. A Chang, J. F Chelkov, G Chen, G Chen, H. S Chen, H. Y Chen, J. C Chen, M. L Chen, S Chen, S. J Chen, X Chen, X. R Chen, Y. B Cheng, H. P Chu, X. K Cibinetto, G Dai, H. L Dai, J. P Dbeyssi, A Dedovich, D Deng, Z. Y Denig, A Denysenko, I Destefanis, M De Mori, F Ding, Y Dong, C Dong, J Dong, L. Y Dong, M. Y Dou, Z. L Du, S. X Duan, P. F Fan, J. Z Fang, J Fang, S. S Fang, X Fang, Y Farinelli, R Fava, L Fedorov, O Feldbauer, F Felici, G Feng, C. Q Fioravanti, E Fritsch, M Fu, C. D Gao, Q Gao, X. L Gao, X. Y Gao, Y Gao, Z Garzia, I Goetzen, K Gong, L Gong, W. X Gradl, W Greco, M Gu, M. H Gu, Y. T Guan, Y. H Guo, A. Q Guo, L. B Guo, R. P Guo, Y Guo, Y. P Haddadi, Z Hafner, A Han, S Hao, X. Q Harris, F. A He, K. L . |
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