Beam Spin Asymmetry Measurements of Deeply Virtual $π$0 Production with CLAS12

Kim, A.; Diehl, S.; Joo, K.; Kubarovsky, V.; Achenbach, P.; Akbar, Z.; Alvarado, J. S.; Armstrong, Whitney R.; Atac, H.; Avakian, H.; Ayerbe Gayoso, C.; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Benkel, B.; Bianconi, A.; Biselli, A. S.; Bondi, M.; Bossù, F.; Boiarinov, S.; Brinkmann, K. T.; Briscoe, W. J.; Brooks, W. K.; Bueltmann, S.; Burkert, V. D.; Capobianco, R.; Carman, D. S.; Carvajal, J. C.; Celentano, A.; Charles, G.; Chatagnon, P.; Chesnokov, V.; Chetry, T.; Ciullo, G.; Clary, B.; Clash, G.; Cole, P. L.; Contalbrigo, M.; Costantini, G.; Crede, V.; D'Angelo, A.; Dashyan, N.; De Vita, R.; Defurne, M.; Deur, A.; Dilks, C.; Djalali, C.; Dupre, R.; Egiyan, H.; Ehrhart, M.; El Alaoui, A.; El Fassi, L.; Fegan, S.; Filippi, A.; Fogler, C.; Gavalian, G.; Gilfoyle, G. P.; Gosta, G.; Girod, F. X.; Glazier, D. I.; Golubenko, A. A.; Gothe, R. W.; Guo, L.; Hafidi, K.; Hakobyan, H.; Hattawy, M.; Hauenstein, F.; Hayward, T. B.; Heddle, D.; Hobart, A.; Holtrop, M.; Hung, Yu-Chun; Ilieva, Y.; Ireland, D. G.; Isupov, E.; Jo, H. S.; Johnston, R.; Joosten, S.; Khachatryan, M.; Khanal, A.; Kim, W.; Klimenko, V.; Kripko, A.; Kuhn, S. E.; Lanza, L.; Leali, M.; Kabir, M. L.; Lee, S.; Lenisa, P.; Li, X.; .J.D. MacGregor, I.; Marchand, D.; Mascagna, V.; McKinnon, B.; Matamoros, D.; Migliorati, S.; Mineeva, T.; Mirazita, M.; Mokeev, V.; Moran, P.; Munoz Camacho, C.; Naidoo, P.; Neupane, K.; Nguyen, D.; Niccolai, S.; Niculescu, G.; Osipenko, M.; Ouillon, M.; Pandey, P.; Paolone, M.; Pappalardo, L. L.; Paremuzyan, R.; Pasyuk, E.; Paul, S. J.; Phelps, W.; Pilleux, N.; Pokhrel, M.; Poudel, J.; Price, J. W.; Prok, Y.; Radic, A.; Ramasubramanian, N.; Reed, Trevor; Richards, J.; Ripani, M.; Ritman, J.; Rossi, P.; Sabatié, F.; Salgado, C.; Schadmand, S.; Schmidt, A.; Sharabian, Y. G.; Shirokov, E. V.; Shrestha, U.; Sokhan, D.; Sparveris, N.; Spreafico, M.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Tan, J.; Trotta, N.; Tyson, R.; Ungaro, M.; Vallarino, S.; Venturelli, L.; Voskanyan, H.; Voutier, E.; Watts, D. P.; Wei, X.; Wishart, R.; Wood, M. H.; Yurov, M.; Zachariou, N.; Zhang, J.; Ziegler, V.; Zurek, M.

doi:10.1016/j.physletb.2024.138459

Beam Spin Asymmetry Measurements of Deeply Virtual $$π$$⁰ Production with CLAS12

Journal Article · Wed Jan 17 00:00:00 EST 2024 · Physics Letters. B

DOI:https://doi.org/10.1016/j.physletb.2024.138459· OSTI ID:2282144

^[1]; Diehl, S.; Joo, K.; Kubarovsky, V.; Achenbach, P.; Akbar, Z.; Alvarado, J. S.; Armstrong, Whitney R.; Atac, H.; Avakian, H.; Ayerbe Gayoso, C.; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Benkel, B.; Bianconi, A.; Biselli, A. S.; Bondi, M.; Bossù, F.; Boiarinov, S. more »

University of Connecticut, Storrs, CT (United States); The CLAS Collaboration. et al.

The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive $$π$$⁰ production in a wide kinematic region with the photon virtualities $$Q$$² up to 8 GeV² and the Bjorken scaling variable $$x$$_$$B$$ in the valence regime. The data were collected by the CE BAF Large Acceptance Spectrometer (CLAS12) at Jefferson Lab with longitudinally polarized 10.6 GeV electrons scattered on an unpolarized liquid-hydrogen target. Sizable asymmetry values indicate a substantial contribution from transverse virtual photon amplitudes to the polarized structure functions. The interpretation of these measurements in terms of the Generalized Parton Distributions (GPDs) demonstrates their sensitivity to the chiral-odd GPD $$\overline{E}$$_$$T$$, which contains information on quark transverse spin densities in unpolarized and polarized nucleons and provides access to the proton’s transverse anomalous magnetic moment. Additionally, the data were compared to a theoretical model based on a Regge formalism that was extended to the high photon virtualities.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: Agencia Nacional de Investigacion y Desarrollo (ANID); Deutsche Forschungsgemeinschaft (DFG); Instituto Nazionale di Fisica Nucleare (INFN); National Research Foundation (NRF) of Korea; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Nuclear Physics (NP); United Kingdom Science and Technology Facilities Council

Contributing Organization:: The CLAS Collaboration

Grant/Contract Number:: AC02-06CH11357; AC05-06OR23177

OSTI ID:: 2282144

Alternate ID(s):: OSTI ID: 2526251

Report Number(s):: DOE/OR/23177--6624; JLAB-PHY--23-3880; arXiv:2307.07874

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 849; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (35)

Some tests for the helicity structure of the Pomeron in ep collisions Arens, T.; Nachtmann, O.; Diehl, M. Zeitschrift f�r Physik C Particles and Fields, Vol. 74, Issue 4 https://doi.org/10.1007/s002880050430	journal	May 1997
Asymmetric gluon distributions and hard diffractive electroproduction Radyushkin, A. V. Physics Letters B, Vol. 385, Issue 1-4 https://doi.org/10.1016/0370-2693(96)00844-1	journal	September 1996
Single-spin azimuthal asymmetry in exclusive electroproduction of π+ mesons Airapetian, A.; Akopov, N.; Akopov, Z. Physics Letters B, Vol. 535, Issue 1-4 https://doi.org/10.1016/S0370-2693(02)01780-X	journal	May 2002
The CLAS12 Spectrometer at Jefferson Laboratory Burkert, V. D.; Elouadrhiri, L.; Adhikari, K. P. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 959 https://doi.org/10.1016/j.nima.2020.163419	journal	April 2020
Transversity decomposition of quark angular momentum Burkardt, Matthias Physics Letters B, Vol. 639, Issue 5 https://doi.org/10.1016/j.physletb.2006.01.076	journal	August 2006
Cross sections for hard exclusive electroproduction of π+ mesons on a hydrogen target Airapetian, A.; Akopov, N.; Akopov, Z. Physics Letters B, Vol. 659, Issue 3 https://doi.org/10.1016/j.physletb.2007.11.079	journal	January 2008
Single-spin azimuthal asymmetry in exclusive electroproduction of π+ mesons on transversely polarized protons Airapetian, A.; Akopov, N.; Akopov, Z. Physics Letters B, Vol. 682, Issue 4-5 https://doi.org/10.1016/j.physletb.2009.11.039	journal	January 2010
Unitarity constraints on charged pion photoproduction at large p⊥ Laget, J. M. Physics Letters B, Vol. 685, Issue 2-3 https://doi.org/10.1016/j.physletb.2010.01.052	journal	March 2010
Unitarity constraints on neutral pion electroproduction Laget, J. M. Physics Letters B, Vol. 695, Issue 1-4 https://doi.org/10.1016/j.physletb.2010.11.014	journal	January 2011
Target and double spin asymmetries of deeply virtual π 0 production with a longitudinally polarized proton target and CLAS Kim, A.; Avakian, H.; Burkert, V. Physics Letters B, Vol. 768 https://doi.org/10.1016/j.physletb.2017.02.032	journal	May 2017
Next-to-leading order corrections to deeply virtual production of pseudoscalar mesons Duplančić, G.; Müller, D.; Passek-Kumerički, K. Physics Letters B, Vol. 771 https://doi.org/10.1016/j.physletb.2017.05.097	journal	August 2017
Measurement of the beam spin asymmetry of e → p → e ′ p ′ η in the deep-inelastic regime with CLAS Zhao, B.; Kim, A.; Joo, K. Physics Letters B, Vol. 789 https://doi.org/10.1016/j.physletb.2018.12.065	journal	February 2019
Measurement of the cross section for hard exclusive π0 muoproduction on the proton Alexeev, M. G.; Alexeev, G. D.; Amoroso, A. Physics Letters B, Vol. 805 https://doi.org/10.1016/j.physletb.2020.135454	journal	June 2020
A multidimensional study of the structure function ratio σLT′/σ0 from hard exclusive π+ electro-production off protons in the GPD regime Diehl, S.; Kim, A.; Joo, K. Physics Letters B, Vol. 839 https://doi.org/10.1016/j.physletb.2023.137761	journal	April 2023
Exclusive meson photo- and electro-production, a window on the structure of hadronic matter Laget, J. M. Progress in Particle and Nuclear Physics, Vol. 111 https://doi.org/10.1016/j.ppnp.2019.103737	journal	March 2020
Experimental exploration of the 3D nucleon structure Diehl, Stefan Progress in Particle and Nuclear Physics, Vol. 133 https://doi.org/10.1016/j.ppnp.2023.104069	journal	November 2023
Threshold pion photoproduction on nucleons Dreschsel, D.; Tiator, L. Journal of Physics G: Nuclear and Particle Physics, Vol. 18, Issue 3 https://doi.org/10.1088/0954-3899/18/3/004	journal	March 1992
Unitarity constraints on meson electroproduction at backward angles Laget, J. M. Physical Review C, Vol. 104, Issue 2 https://doi.org/10.1103/PhysRevC.104.025202	journal	August 2021
Exclusive neutral pion electroproduction in the deeply virtual regime Fuchey, E.; Camsonne, A.; Muñoz Camacho, C. Physical Review C, Vol. 83, Issue 2 https://doi.org/10.1103/PhysRevC.83.025201	journal	February 2011
Exclusive η electroproduction at W > 2 GeV with CLAS and transversity generalized parton distributions Bedlinskiy, I.; Kubarovsky, V.; Stoler, P. Physical Review C, Vol. 95, Issue 3 https://doi.org/10.1103/PhysRevC.95.035202	journal	March 2017
Updated QCD global analysis of single transverse-spin asymmetries: Extracting H˜ , and the role of the Soffer bound and lattice QCD Gamberg, Leonard; Malda, Michel; Miller, Joshua A. Physical Review D, Vol. 106, Issue 3 https://doi.org/10.1103/PhysRevD.106.034014	journal	August 2022
Diffractive leptoproduction of vector mesons in QCD Brodsky, Stanley J.; Frankfurt, L.; Gunion, J. F. Physical Review D, Vol. 50, Issue 5 https://doi.org/10.1103/PhysRevD.50.3134	journal	September 1994
Factorization for hard exclusive electroproduction of mesons in QCD Collins, John C.; Frankfurt, Leonid; Strikman, Mark Physical Review D, Vol. 56, Issue 5 https://doi.org/10.1103/PhysRevD.56.2982	journal	September 1997
Nonforward parton distributions Radyushkin, A. V. Physical Review D, Vol. 56, Issue 9 https://doi.org/10.1103/PhysRevD.56.5524	journal	November 1997
Nucleon tensor charge from exclusive π 0 electroproduction Ahmad, Saeed; Goldstein, Gary R.; Liuti, Simonetta Physical Review D, Vol. 79, Issue 5 https://doi.org/10.1103/PhysRevD.79.054014	journal	March 2009
Flexible parametrization of generalized parton distributions from deeply virtual Compton scattering observables Goldstein, Gary R.; Hernandez, J. Osvaldo Gonzalez; Liuti, Simonetta Physical Review D, Vol. 84, Issue 3 https://doi.org/10.1103/PhysRevD.84.034007	journal	August 2011
Flexible parametrization of generalized parton distributions: The chiral-odd sector Goldstein, Gary R.; Hernandez, J. Osvaldo Gonzalez; Liuti, Simonetta Physical Review D, Vol. 91, Issue 11 https://doi.org/10.1103/PhysRevD.91.114013	journal	June 2015
Generalized parton distributions from charged current meson production Siddikov, Marat; Schmidt, Iván Physical Review D, Vol. 99, Issue 11 https://doi.org/10.1103/PhysRevD.99.116005	journal	June 2019
Measurement of Exclusive π 0 Electroproduction Structure Functions and their Relationship to Transverse Generalized Parton Distributions Bedlinskiy, I.; Kubarovsky, V.; Niccolai, S. Physical Review Letters, Vol. 109, Issue 11 https://doi.org/10.1103/PhysRevLett.109.112001	journal	September 2012
Rosenbluth Separation of the π 0 Electroproduction Cross Section Defurne, M.; Mazouz, M.; Ahmed, Z. Physical Review Letters, Vol. 117, Issue 26 https://doi.org/10.1103/PhysRevLett.117.262001	journal	December 2016
Rosenbluth Separation of the π 0 Electroproduction Cross Section Off the Neutron Mazouz, M.; Ahmed, Z.; Albataineh, H. Physical Review Letters, Vol. 118, Issue 22 https://doi.org/10.1103/PhysRevLett.118.222002	journal	June 2017
Transversity in hard exclusive electroproduction of pseudoscalar mesons Goloskokov, S. V.; Kroll, P. The European Physical Journal A, Vol. 47, Issue 9 https://doi.org/10.1140/epja/i2011-11112-6	journal	September 2011
Next-to-leading order corrections in exclusive meson production Diehl, M.; Kugler, W. The European Physical Journal C, Vol. 52, Issue 4 https://doi.org/10.1140/epjc/s10052-007-0423-3	journal	October 2007
An attempt to understand exclusive π + electroproduction Goloskokov, S. V.; Kroll, P. The European Physical Journal C, Vol. 65, Issue 1-2 https://doi.org/10.1140/epjc/s10052-009-1178-9	journal	November 2009
On the analysis of lepton scattering on longitudinally or transversely polarized protons Diehl, M.; Sapeta, S. The European Physical Journal C, Vol. 41, Issue 4 https://doi.org/10.1140/epjc/s2005-02242-9	journal	June 2005

Similar Records

Deeply Virtual Compton Scattering with CLAS12

Conference · Mon May 21 00:00:00 EDT 2007 · OSTI ID:924020

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Beam Spin Asymmetry Measurements of Deeply Virtual $$π$$0 Production with CLAS12

Citation Formats

References (35)

Similar Records

Related Subjects

Beam Spin Asymmetry Measurements of Deeply Virtual $$π$$⁰ Production with CLAS12