Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c

Abstract The $ π^{−} $p interactions with at least one charged secondary produced at polar angle ∼90° in c.m.s. and having the transverse momentum above 1 GeV/c were investigated. The data were obtained using streamer chamber magnetic spectrometer RISK at 38 GeV/c π beam from Serpukhov accelerator....
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Autor*in:	Bannikov, A. V. [verfasserIn] Bohm, J. Dominik, W. Grishkevich, Ya. V. Gemesy, T. Javrishvili, A. K. Jenik, L. Kharchilava, A. I. Krasznovszky, J. Krumstein, Z. V. Krysteva, V. Lomtadze, T. A. Merekov, Yu. P. Nedev, S. Penev, V. N. Petrukhin, V. I. Pinter, Gy. Piška, K. Šafařik, K. Shelkov, G. A. Shklovskaja, A. I. Valkár, Š. Vertogradov, L. S. Závada, P.

Format:	Artikel
Sprache:	Englisch

Erschienen:	1991

Schlagwörter:	Transverse Momentum Momentum Transfer Polar Angle Production Plane Spin Projection

Anmerkung:	© Springer-Verlag 1991

Übergeordnetes Werk:	Enthalten in: Zeitschrift für Physik - Springer-Verlag, 1979, 49(1991), 2 vom: Juni, Seite 245-249
Übergeordnetes Werk:	volume:49 ; year:1991 ; number:2 ; month:06 ; pages:245-249

Links:	Volltext

DOI / URN:	10.1007/BF01555497

Katalog-ID:	OLC2091910066

Internformat


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520			\|a Abstract The $ π^{−} $p interactions with at least one charged secondary produced at polar angle ∼90° in c.m.s. and having the transverse momentum above 1 GeV/c were investigated. The data were obtained using streamer chamber magnetic spectrometer RISK at 38 GeV/c π beam from Serpukhov accelerator. The analyzis of associated production in reconstructed events suggests, that if the transverse momentum of a pair of oppositely charged secondaries compensates the trigger particlep⊥ practically completely, this pair is the product of the $ ρ^{0} $ decay in marked fraction of such events. We observed a large spin-alignment for the $ ρ^{0} $-mesons selected as described above: the probability of zero spin projection onto the normal to the $ ρ^{0} $ production plane is equal to ρ00T=0.86±0.23. The enhancement of the number of events, in which the $ ρ^{0} $ picks up practically full momentum transfer carrying by the exchange, and also the enlarged tensor polarization for the $ ρ^{0} $-mesons in these events could be qualitatively explained as manifestation of direct $ ρ^{0} $-production via the QCD higher twist processes in the highp⊥$ π^{−} $p collisions. At the same time, the observed effects are markedly larger than the values predicted with QCD model in which the higher twist corrections were included.
650		4	\|a Transverse Momentum
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700	1		\|a Gemesy, T. \|4 aut
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700	1		\|a Závada, P. \|4 aut
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allfields	10.1007/BF01555497 doi (DE-627)OLC2091910066 (DE-He213)BF01555497-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Bannikov, A. V. verfasserin aut Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c 1991 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1991 Abstract The $ π^{−} $p interactions with at least one charged secondary produced at polar angle ∼90° in c.m.s. and having the transverse momentum above 1 GeV/c were investigated. The data were obtained using streamer chamber magnetic spectrometer RISK at 38 GeV/c π beam from Serpukhov accelerator. The analyzis of associated production in reconstructed events suggests, that if the transverse momentum of a pair of oppositely charged secondaries compensates the trigger particlep⊥ practically completely, this pair is the product of the $ ρ^{0} $ decay in marked fraction of such events. We observed a large spin-alignment for the $ ρ^{0} $-mesons selected as described above: the probability of zero spin projection onto the normal to the $ ρ^{0} $ production plane is equal to ρ00T=0.86±0.23. The enhancement of the number of events, in which the $ ρ^{0} $ picks up practically full momentum transfer carrying by the exchange, and also the enlarged tensor polarization for the $ ρ^{0} $-mesons in these events could be qualitatively explained as manifestation of direct $ ρ^{0} $-production via the QCD higher twist processes in the highp⊥$ π^{−} $p collisions. At the same time, the observed effects are markedly larger than the values predicted with QCD model in which the higher twist corrections were included. Transverse Momentum Momentum Transfer Polar Angle Production Plane Spin Projection Bohm, J. aut Dominik, W. aut Grishkevich, Ya. V. aut Gemesy, T. aut Javrishvili, A. K. aut Jenik, L. aut Kharchilava, A. I. aut Krasznovszky, J. aut Krumstein, Z. V. aut Krysteva, V. aut Lomtadze, T. A. aut Merekov, Yu. P. aut Nedev, S. aut Penev, V. N. aut Petrukhin, V. I. aut Pinter, Gy. aut Piška, K. aut Šafařik, K. aut Shelkov, G. A. aut Shklovskaja, A. I. aut Valkár, Š. aut Vertogradov, L. S. aut Závada, P. aut Enthalten in Zeitschrift für Physik Springer-Verlag, 1979 49(1991), 2 vom: Juni, Seite 245-249 (DE-627)130618799 (DE-600)795252-1 (DE-576)016125487 0170-9739 nnns volume:49 year:1991 number:2 month:06 pages:245-249 https://doi.org/10.1007/BF01555497 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_62 GBV_ILN_70 GBV_ILN_130 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2012 GBV_ILN_2014 GBV_ILN_2018 GBV_ILN_2409 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4126 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4313 GBV_ILN_4315 GBV_ILN_4319 GBV_ILN_4323 AR 49 1991 2 06 245-249
spelling	10.1007/BF01555497 doi (DE-627)OLC2091910066 (DE-He213)BF01555497-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Bannikov, A. V. verfasserin aut Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c 1991 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1991 Abstract The $ π^{−} $p interactions with at least one charged secondary produced at polar angle ∼90° in c.m.s. and having the transverse momentum above 1 GeV/c were investigated. The data were obtained using streamer chamber magnetic spectrometer RISK at 38 GeV/c π beam from Serpukhov accelerator. The analyzis of associated production in reconstructed events suggests, that if the transverse momentum of a pair of oppositely charged secondaries compensates the trigger particlep⊥ practically completely, this pair is the product of the $ ρ^{0} $ decay in marked fraction of such events. We observed a large spin-alignment for the $ ρ^{0} $-mesons selected as described above: the probability of zero spin projection onto the normal to the $ ρ^{0} $ production plane is equal to ρ00T=0.86±0.23. The enhancement of the number of events, in which the $ ρ^{0} $ picks up practically full momentum transfer carrying by the exchange, and also the enlarged tensor polarization for the $ ρ^{0} $-mesons in these events could be qualitatively explained as manifestation of direct $ ρ^{0} $-production via the QCD higher twist processes in the highp⊥$ π^{−} $p collisions. At the same time, the observed effects are markedly larger than the values predicted with QCD model in which the higher twist corrections were included. Transverse Momentum Momentum Transfer Polar Angle Production Plane Spin Projection Bohm, J. aut Dominik, W. aut Grishkevich, Ya. V. aut Gemesy, T. aut Javrishvili, A. K. aut Jenik, L. aut Kharchilava, A. I. aut Krasznovszky, J. aut Krumstein, Z. V. aut Krysteva, V. aut Lomtadze, T. A. aut Merekov, Yu. P. aut Nedev, S. aut Penev, V. N. aut Petrukhin, V. I. aut Pinter, Gy. aut Piška, K. aut Šafařik, K. aut Shelkov, G. A. aut Shklovskaja, A. I. aut Valkár, Š. aut Vertogradov, L. S. aut Závada, P. aut Enthalten in Zeitschrift für Physik Springer-Verlag, 1979 49(1991), 2 vom: Juni, Seite 245-249 (DE-627)130618799 (DE-600)795252-1 (DE-576)016125487 0170-9739 nnns volume:49 year:1991 number:2 month:06 pages:245-249 https://doi.org/10.1007/BF01555497 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_62 GBV_ILN_70 GBV_ILN_130 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2012 GBV_ILN_2014 GBV_ILN_2018 GBV_ILN_2409 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4126 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4313 GBV_ILN_4315 GBV_ILN_4319 GBV_ILN_4323 AR 49 1991 2 06 245-249
allfields_unstemmed	10.1007/BF01555497 doi (DE-627)OLC2091910066 (DE-He213)BF01555497-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Bannikov, A. V. verfasserin aut Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c 1991 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1991 Abstract The $ π^{−} $p interactions with at least one charged secondary produced at polar angle ∼90° in c.m.s. and having the transverse momentum above 1 GeV/c were investigated. The data were obtained using streamer chamber magnetic spectrometer RISK at 38 GeV/c π beam from Serpukhov accelerator. The analyzis of associated production in reconstructed events suggests, that if the transverse momentum of a pair of oppositely charged secondaries compensates the trigger particlep⊥ practically completely, this pair is the product of the $ ρ^{0} $ decay in marked fraction of such events. We observed a large spin-alignment for the $ ρ^{0} $-mesons selected as described above: the probability of zero spin projection onto the normal to the $ ρ^{0} $ production plane is equal to ρ00T=0.86±0.23. The enhancement of the number of events, in which the $ ρ^{0} $ picks up practically full momentum transfer carrying by the exchange, and also the enlarged tensor polarization for the $ ρ^{0} $-mesons in these events could be qualitatively explained as manifestation of direct $ ρ^{0} $-production via the QCD higher twist processes in the highp⊥$ π^{−} $p collisions. At the same time, the observed effects are markedly larger than the values predicted with QCD model in which the higher twist corrections were included. Transverse Momentum Momentum Transfer Polar Angle Production Plane Spin Projection Bohm, J. aut Dominik, W. aut Grishkevich, Ya. V. aut Gemesy, T. aut Javrishvili, A. K. aut Jenik, L. aut Kharchilava, A. I. aut Krasznovszky, J. aut Krumstein, Z. V. aut Krysteva, V. aut Lomtadze, T. A. aut Merekov, Yu. P. aut Nedev, S. aut Penev, V. N. aut Petrukhin, V. I. aut Pinter, Gy. aut Piška, K. aut Šafařik, K. aut Shelkov, G. A. aut Shklovskaja, A. I. aut Valkár, Š. aut Vertogradov, L. S. aut Závada, P. aut Enthalten in Zeitschrift für Physik Springer-Verlag, 1979 49(1991), 2 vom: Juni, Seite 245-249 (DE-627)130618799 (DE-600)795252-1 (DE-576)016125487 0170-9739 nnns volume:49 year:1991 number:2 month:06 pages:245-249 https://doi.org/10.1007/BF01555497 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_62 GBV_ILN_70 GBV_ILN_130 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2012 GBV_ILN_2014 GBV_ILN_2018 GBV_ILN_2409 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4126 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4313 GBV_ILN_4315 GBV_ILN_4319 GBV_ILN_4323 AR 49 1991 2 06 245-249
allfieldsGer	10.1007/BF01555497 doi (DE-627)OLC2091910066 (DE-He213)BF01555497-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Bannikov, A. V. verfasserin aut Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c 1991 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1991 Abstract The $ π^{−} $p interactions with at least one charged secondary produced at polar angle ∼90° in c.m.s. and having the transverse momentum above 1 GeV/c were investigated. The data were obtained using streamer chamber magnetic spectrometer RISK at 38 GeV/c π beam from Serpukhov accelerator. The analyzis of associated production in reconstructed events suggests, that if the transverse momentum of a pair of oppositely charged secondaries compensates the trigger particlep⊥ practically completely, this pair is the product of the $ ρ^{0} $ decay in marked fraction of such events. We observed a large spin-alignment for the $ ρ^{0} $-mesons selected as described above: the probability of zero spin projection onto the normal to the $ ρ^{0} $ production plane is equal to ρ00T=0.86±0.23. The enhancement of the number of events, in which the $ ρ^{0} $ picks up practically full momentum transfer carrying by the exchange, and also the enlarged tensor polarization for the $ ρ^{0} $-mesons in these events could be qualitatively explained as manifestation of direct $ ρ^{0} $-production via the QCD higher twist processes in the highp⊥$ π^{−} $p collisions. At the same time, the observed effects are markedly larger than the values predicted with QCD model in which the higher twist corrections were included. Transverse Momentum Momentum Transfer Polar Angle Production Plane Spin Projection Bohm, J. aut Dominik, W. aut Grishkevich, Ya. V. aut Gemesy, T. aut Javrishvili, A. K. aut Jenik, L. aut Kharchilava, A. I. aut Krasznovszky, J. aut Krumstein, Z. V. aut Krysteva, V. aut Lomtadze, T. A. aut Merekov, Yu. P. aut Nedev, S. aut Penev, V. N. aut Petrukhin, V. I. aut Pinter, Gy. aut Piška, K. aut Šafařik, K. aut Shelkov, G. A. aut Shklovskaja, A. I. aut Valkár, Š. aut Vertogradov, L. S. aut Závada, P. aut Enthalten in Zeitschrift für Physik Springer-Verlag, 1979 49(1991), 2 vom: Juni, Seite 245-249 (DE-627)130618799 (DE-600)795252-1 (DE-576)016125487 0170-9739 nnns volume:49 year:1991 number:2 month:06 pages:245-249 https://doi.org/10.1007/BF01555497 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_62 GBV_ILN_70 GBV_ILN_130 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2012 GBV_ILN_2014 GBV_ILN_2018 GBV_ILN_2409 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4126 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4313 GBV_ILN_4315 GBV_ILN_4319 GBV_ILN_4323 AR 49 1991 2 06 245-249
allfieldsSound	10.1007/BF01555497 doi (DE-627)OLC2091910066 (DE-He213)BF01555497-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Bannikov, A. V. verfasserin aut Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c 1991 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1991 Abstract The $ π^{−} $p interactions with at least one charged secondary produced at polar angle ∼90° in c.m.s. and having the transverse momentum above 1 GeV/c were investigated. The data were obtained using streamer chamber magnetic spectrometer RISK at 38 GeV/c π beam from Serpukhov accelerator. The analyzis of associated production in reconstructed events suggests, that if the transverse momentum of a pair of oppositely charged secondaries compensates the trigger particlep⊥ practically completely, this pair is the product of the $ ρ^{0} $ decay in marked fraction of such events. We observed a large spin-alignment for the $ ρ^{0} $-mesons selected as described above: the probability of zero spin projection onto the normal to the $ ρ^{0} $ production plane is equal to ρ00T=0.86±0.23. The enhancement of the number of events, in which the $ ρ^{0} $ picks up practically full momentum transfer carrying by the exchange, and also the enlarged tensor polarization for the $ ρ^{0} $-mesons in these events could be qualitatively explained as manifestation of direct $ ρ^{0} $-production via the QCD higher twist processes in the highp⊥$ π^{−} $p collisions. At the same time, the observed effects are markedly larger than the values predicted with QCD model in which the higher twist corrections were included. Transverse Momentum Momentum Transfer Polar Angle Production Plane Spin Projection Bohm, J. aut Dominik, W. aut Grishkevich, Ya. V. aut Gemesy, T. aut Javrishvili, A. K. aut Jenik, L. aut Kharchilava, A. I. aut Krasznovszky, J. aut Krumstein, Z. V. aut Krysteva, V. aut Lomtadze, T. A. aut Merekov, Yu. P. aut Nedev, S. aut Penev, V. N. aut Petrukhin, V. I. aut Pinter, Gy. aut Piška, K. aut Šafařik, K. aut Shelkov, G. A. aut Shklovskaja, A. I. aut Valkár, Š. aut Vertogradov, L. S. aut Závada, P. aut Enthalten in Zeitschrift für Physik Springer-Verlag, 1979 49(1991), 2 vom: Juni, Seite 245-249 (DE-627)130618799 (DE-600)795252-1 (DE-576)016125487 0170-9739 nnns volume:49 year:1991 number:2 month:06 pages:245-249 https://doi.org/10.1007/BF01555497 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_62 GBV_ILN_70 GBV_ILN_130 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2012 GBV_ILN_2014 GBV_ILN_2018 GBV_ILN_2409 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4126 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4313 GBV_ILN_4315 GBV_ILN_4319 GBV_ILN_4323 AR 49 1991 2 06 245-249
language	English
source	Enthalten in Zeitschrift für Physik 49(1991), 2 vom: Juni, Seite 245-249 volume:49 year:1991 number:2 month:06 pages:245-249
sourceStr	Enthalten in Zeitschrift für Physik 49(1991), 2 vom: Juni, Seite 245-249 volume:49 year:1991 number:2 month:06 pages:245-249
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topic_facet	Transverse Momentum Momentum Transfer Polar Angle Production Plane Spin Projection
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authorswithroles_txt_mv	Bannikov, A. V. @@aut@@ Bohm, J. @@aut@@ Dominik, W. @@aut@@ Grishkevich, Ya. V. @@aut@@ Gemesy, T. @@aut@@ Javrishvili, A. K. @@aut@@ Jenik, L. @@aut@@ Kharchilava, A. I. @@aut@@ Krasznovszky, J. @@aut@@ Krumstein, Z. V. @@aut@@ Krysteva, V. @@aut@@ Lomtadze, T. A. @@aut@@ Merekov, Yu. P. @@aut@@ Nedev, S. @@aut@@ Penev, V. N. @@aut@@ Petrukhin, V. I. @@aut@@ Pinter, Gy. @@aut@@ Piška, K. @@aut@@ Šafařik, K. @@aut@@ Shelkov, G. A. @@aut@@ Shklovskaja, A. I. @@aut@@ Valkár, Š. @@aut@@ Vertogradov, L. S. @@aut@@ Závada, P. @@aut@@
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author	Bannikov, A. V.
spellingShingle	Bannikov, A. V. ddc 530 misc Transverse Momentum misc Momentum Transfer misc Polar Angle misc Production Plane misc Spin Projection Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c
authorStr	Bannikov, A. V.
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topic_title	530 VZ Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c Transverse Momentum Momentum Transfer Polar Angle Production Plane Spin Projection
topic	ddc 530 misc Transverse Momentum misc Momentum Transfer misc Polar Angle misc Production Plane misc Spin Projection
topic_unstemmed	ddc 530 misc Transverse Momentum misc Momentum Transfer misc Polar Angle misc Production Plane misc Spin Projection
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title	Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c
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title_full	Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c
author_sort	Bannikov, A. V.
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author_browse	Bannikov, A. V. Bohm, J. Dominik, W. Grishkevich, Ya. V. Gemesy, T. Javrishvili, A. K. Jenik, L. Kharchilava, A. I. Krasznovszky, J. Krumstein, Z. V. Krysteva, V. Lomtadze, T. A. Merekov, Yu. P. Nedev, S. Penev, V. N. Petrukhin, V. I. Pinter, Gy. Piška, K. Šafařik, K. Shelkov, G. A. Shklovskaja, A. I. Valkár, Š. Vertogradov, L. S. Závada, P.
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author-letter	Bannikov, A. V.
doi_str_mv	10.1007/BF01555497
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title_sort	evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 gev/c
title_auth	Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c
abstract	Abstract The $ π^{−} $p interactions with at least one charged secondary produced at polar angle ∼90° in c.m.s. and having the transverse momentum above 1 GeV/c were investigated. The data were obtained using streamer chamber magnetic spectrometer RISK at 38 GeV/c π beam from Serpukhov accelerator. The analyzis of associated production in reconstructed events suggests, that if the transverse momentum of a pair of oppositely charged secondaries compensates the trigger particlep⊥ practically completely, this pair is the product of the $ ρ^{0} $ decay in marked fraction of such events. We observed a large spin-alignment for the $ ρ^{0} $-mesons selected as described above: the probability of zero spin projection onto the normal to the $ ρ^{0} $ production plane is equal to ρ00T=0.86±0.23. The enhancement of the number of events, in which the $ ρ^{0} $ picks up practically full momentum transfer carrying by the exchange, and also the enlarged tensor polarization for the $ ρ^{0} $-mesons in these events could be qualitatively explained as manifestation of direct $ ρ^{0} $-production via the QCD higher twist processes in the highp⊥$ π^{−} $p collisions. At the same time, the observed effects are markedly larger than the values predicted with QCD model in which the higher twist corrections were included. © Springer-Verlag 1991
abstractGer	Abstract The $ π^{−} $p interactions with at least one charged secondary produced at polar angle ∼90° in c.m.s. and having the transverse momentum above 1 GeV/c were investigated. The data were obtained using streamer chamber magnetic spectrometer RISK at 38 GeV/c π beam from Serpukhov accelerator. The analyzis of associated production in reconstructed events suggests, that if the transverse momentum of a pair of oppositely charged secondaries compensates the trigger particlep⊥ practically completely, this pair is the product of the $ ρ^{0} $ decay in marked fraction of such events. We observed a large spin-alignment for the $ ρ^{0} $-mesons selected as described above: the probability of zero spin projection onto the normal to the $ ρ^{0} $ production plane is equal to ρ00T=0.86±0.23. The enhancement of the number of events, in which the $ ρ^{0} $ picks up practically full momentum transfer carrying by the exchange, and also the enlarged tensor polarization for the $ ρ^{0} $-mesons in these events could be qualitatively explained as manifestation of direct $ ρ^{0} $-production via the QCD higher twist processes in the highp⊥$ π^{−} $p collisions. At the same time, the observed effects are markedly larger than the values predicted with QCD model in which the higher twist corrections were included. © Springer-Verlag 1991
abstract_unstemmed	Abstract The $ π^{−} $p interactions with at least one charged secondary produced at polar angle ∼90° in c.m.s. and having the transverse momentum above 1 GeV/c were investigated. The data were obtained using streamer chamber magnetic spectrometer RISK at 38 GeV/c π beam from Serpukhov accelerator. The analyzis of associated production in reconstructed events suggests, that if the transverse momentum of a pair of oppositely charged secondaries compensates the trigger particlep⊥ practically completely, this pair is the product of the $ ρ^{0} $ decay in marked fraction of such events. We observed a large spin-alignment for the $ ρ^{0} $-mesons selected as described above: the probability of zero spin projection onto the normal to the $ ρ^{0} $ production plane is equal to ρ00T=0.86±0.23. The enhancement of the number of events, in which the $ ρ^{0} $ picks up practically full momentum transfer carrying by the exchange, and also the enlarged tensor polarization for the $ ρ^{0} $-mesons in these events could be qualitatively explained as manifestation of direct $ ρ^{0} $-production via the QCD higher twist processes in the highp⊥$ π^{−} $p collisions. At the same time, the observed effects are markedly larger than the values predicted with QCD model in which the higher twist corrections were included. © Springer-Verlag 1991
collection_details	GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_62 GBV_ILN_70 GBV_ILN_130 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2012 GBV_ILN_2014 GBV_ILN_2018 GBV_ILN_2409 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4126 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4313 GBV_ILN_4315 GBV_ILN_4319 GBV_ILN_4323
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title_short	Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c
url	https://doi.org/10.1007/BF01555497
remote_bool	false
author2	Bohm, J. Dominik, W. Grishkevich, Ya. V. Gemesy, T. Javrishvili, A. K. Jenik, L. Kharchilava, A. I. Krasznovszky, J. Krumstein, Z. V. Krysteva, V. Lomtadze, T. A. Merekov, Yu. P. Nedev, S. Penev, V. N. Petrukhin, V. I. Pinter, Gy Piška, K. Šafařik, K. Shelkov, G. A. Shklovskaja, A. I. Valkár, Š. Vertogradov, L. S. Závada, P.
author2Str	Bohm, J. Dominik, W. Grishkevich, Ya. V. Gemesy, T. Javrishvili, A. K. Jenik, L. Kharchilava, A. I. Krasznovszky, J. Krumstein, Z. V. Krysteva, V. Lomtadze, T. A. Merekov, Yu. P. Nedev, S. Penev, V. N. Petrukhin, V. I. Pinter, Gy Piška, K. Šafařik, K. Shelkov, G. A. Shklovskaja, A. I. Valkár, Š. Vertogradov, L. S. Závada, P.
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doi_str	10.1007/BF01555497
up_date	2024-07-04T10:31:07.913Z
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The data were obtained using streamer chamber magnetic spectrometer RISK at 38 GeV/c π beam from Serpukhov accelerator. The analyzis of associated production in reconstructed events suggests, that if the transverse momentum of a pair of oppositely charged secondaries compensates the trigger particlep⊥ practically completely, this pair is the product of the $ ρ^{0} $ decay in marked fraction of such events. We observed a large spin-alignment for the $ ρ^{0} $-mesons selected as described above: the probability of zero spin projection onto the normal to the $ ρ^{0} $ production plane is equal to ρ00T=0.86±0.23. The enhancement of the number of events, in which the $ ρ^{0} $ picks up practically full momentum transfer carrying by the exchange, and also the enlarged tensor polarization for the $ ρ^{0} $-mesons in these events could be qualitatively explained as manifestation of direct $ ρ^{0} $-production via the QCD higher twist processes in the highp⊥$ π^{−} $p collisions. At the same time, the observed effects are markedly larger than the values predicted with QCD model in which the higher twist corrections were included.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Transverse Momentum</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Momentum Transfer</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Polar Angle</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Production Plane</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Spin Projection</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Bohm, J.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Dominik, W.</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Grishkevich, Ya. 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Evidence for higher twist mechanisms in highp⊥$ π^{−} $p events with prompt $ ρ^{0} $ production at 38 GeV/c

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