Target and beam-target spin asymmetries in exclusive pion electroproduction for Q2>1GeV2 . I. ep→eπ+n

Bosted, P. E.; Amaryan, M. J.; Anefalos Pereira, S.; Avakian, H.; Badui, R. A.; Ball, J.; Baltzell, N. A.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Biselli, A. S.; Briscoe, W. J.; Bültmann, S.; Burkert, V. D.; Carman, D. S.; Celentano, A.; Chandavar, S.; Charles, G.; Ciullo, G.; Clark, L.; Colaneri, L.; Cole, P. L.; Contalbrigo, M.; Crede, V.; D'Angelo, A.; De Vita, R.; Deur, A.; De Sanctis, E.; Djalali, C.; Dupre, R.; Egiyan, H.; El Alaoui, A.; El Fassi, L.; Elouadrhiri, L.; Eugenio, P.; Fanchini, E.; Fedotov, G.; Filippi, A.; Fleming, J. A.; Forest, T.; Fradi, A.; Gevorgyan, N.; Ghandilyan, Y.; Gilfoyle, G. P.; Girod, F. X.; Gleason, C.; Gohn, W.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Hakobyan, H.; Hattawy, M.; Hicks, K.; Holtrop, M.; Hughes, S. M.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Jiang, H.; Jo, H. S.; Joo, K.; Joosten, S.; Khachatryan, G.; Khandaker, M.; Kim, A.; Kim, W.; Klein, F. J.; Koirala, S.; Kubarovsky, V.; Kuhn, S. E.; Lanza, L.; Net, L. A.; Lenisa, P.; Livingston, K.; MacGregor, I. J.  D.; McCracken, M. E.; McKinnon, B.; Meyer, C. A.; Mirazita, M.; Mokeev, V. I.; Montgomery, R. A.; Munevar, E.; Munoz Camacho, C.; Murdoch, G.; Nadel-Turonski, P.; Niccolai, S.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Pasyuk, E.; Peng, P.; Phelps, W.; Pisano, S.; Pogorelko, O.; Price, J. W.; Prok, Y.; Protopopescu, D.; Puckett, A. J.  R.; Raue, B. A.; Ripani, M.; Rosner, G.; Rossi, P.; Schumacher, R. A.; Seder, E.; Skorodumina, Iu.; Smith, G. D.; Sokhan, D.; Sparveris, N.; Stankovic, I.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Tian, Ye; Torayev, B.; Ungaro, M.; Voskanyan, H.; Voutier, E.; Walford, N. K.; Wei, X.; Weinstein, L. B.; Zachariou, N.; Zhang, J.; Zhao, Z. W.; Zonta, I.

doi:10.1103/PhysRevC.95.035206

Title: Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^{2} > 1 {GeV}^{2}$ . I. $e p \to e π^{+} n$

Journal Article · Mon Mar 20 00:00:00 EDT 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.035206· OSTI ID:1348183

Bosted, P. E.; Amaryan, M. J.; Anefalos Pereira, S.; Avakian, H.; Badui, R. A.; Ball, J.; Baltzell, N. A.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Biselli, A. S.; Briscoe, W. J.; Bültmann, S.; Burkert, V. D.; Carman, D. S.; Celentano, A.; Chandavar, S.; Charles, G.; Ciullo, G.; Clark, L. more »

Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive π+ electroproduction reaction γ*p → nπ⁺. The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic range covered is 1.1 < W < 3 GeV and 1 < Q² < 6GeV². Results were obtained for about 6000 bins in W, Q², cos(θ*), and Φ*. Except at forward angles, very large target-spin asymmetries are observed over the entire W region. Reasonable agreement is found with phenomenological fits to previous data for W < 1.6 GeV, but very large differences are seen at higher values of W. Finally, a generalized parton distributions (GPD)-based model is in poor agreement with the data. When combined with cross-sectional measurements, the present results provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q², for resonances with masses as high as 2.4 GeV.

View Accepted Manuscript (DOE)

View Accepted Manuscript (Publisher)

Cite

Export

Save

Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); George Washington Univ., Washington, DC (United States); Mississippi State Univ., Starkville, MS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); United Kingdom Science and Technology Facilities Council; National Research Foundation of Korea (NRF)

Contributing Organization:: CLAS Collaboration

Grant/Contract Number:: AC05-84ER40150; AC02-06CH11357; SC0016583; FG02-07ER41528

OSTI ID:: 1348183

Alternate ID(s):: OSTI ID: 1347813; OSTI ID: 1371940; OSTI ID: 1439599

Report Number(s):: JLAB-PHY-16-2294; DOE/OR/23177-4014; arXiv:1611.07518; PRVCAN; TRN: US1700597

Journal Information:: Physical Review C, Vol. 95, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 7 works

Citation information provided by
Web of Science

References (27)

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
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
Single $π^{+}$ electroproduction on the proton in the first and second resonance regions at $0.25 {GeV}^{2} < Q^{2} < 0.65 {GeV}^{2}$ Egiyan, H.; Aznauryan, I. G.; Burkert, V. D. Physical Review C, Vol. 73, Issue 2 https://doi.org/10.1103/PhysRevC.73.025204	journal	February 2006
Review of Particle Physics Olive, K. A. Chinese Physics C, Vol. 40, Issue 10 https://doi.org/10.1088/1674-1137/40/10/100001	journal	October 2016
Target and beam-target spin asymmetries in exclusive $π^{+}$ and $π^{-}$ electroproduction with 1.6- to 5.7-GeV electrons Bosted, P. E.; Biselli, A. S.; Careccia, S. Physical Review C, Vol. 94, Issue 5 https://doi.org/10.1103/PhysRevC.94.055201	journal	November 2016
Multipole amplitudes of pion photoproduction on nucleons up to $2 GeV$ using dispersion relations and the unitary isobar model Aznauryan, I. G. Physical Review C, Vol. 67, Issue 1 https://doi.org/10.1103/PhysRevC.67.015209	journal	January 2003
The CEBAF large acceptance spectrometer (CLAS) Mecking, B. A.; Adams, G.; Ahmad, S. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 503, Issue 3 https://doi.org/10.1016/S0168-9002(03)01001-5	journal	May 2003
Precise determination of the deuteron spin structure at low to moderate $Q^{2}$ with CLAS and extraction of the neutron contribution Guler, N.; Fersch, R. G.; Kuhn, S. E. Physical Review C, Vol. 92, Issue 5 https://doi.org/10.1103/PhysRevC.92.055201	journal	November 2015
Cross sections and beam asymmetries for $\vec{e} p \to e n π^{+}$ in the nucleon resonance region for $1.7 ⩽ Q^{2} ⩽ 4.5$ GeV $^{2}$ Park, K.; Burkert, V. D.; Kim, W. Physical Review C, Vol. 77, Issue 1 https://doi.org/10.1103/PhysRevC.77.015208	journal	January 2008
Determination of the pion form factor up to $Q^{2} = 4$ ${GeV}^{2}$ from single-charged-pion electroproduction Bebek, C. J.; Brown, C. N.; Herzlinger, M. Physical Review D, Vol. 13, Issue 1 https://doi.org/10.1103/PhysRevD.13.25	journal	January 1976
Electroproduction of single pions at low $ε$ and a measurement of the pion form factor up to $Q^{2} = 10$ ${GeV}^{2}$ Bebek, C. J.; Brown, C. N.; Holmes, S. D. Physical Review D, Vol. 17, Issue 7 https://doi.org/10.1103/PhysRevD.17.1693	journal	April 1978
Measurement of beam-spin asymmetries for π+ electroproduction above the baryon resonance region Avakian, H.; Burkert, V. D.; Elouadrhiri, L. Physical Review D, Vol. 69, Issue 11 https://doi.org/10.1103/PhysRevD.69.112004	journal	June 2004
A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV Drechsel, D.; Hanstein, O.; Kamalov, S. S. Nuclear Physics A, Vol. 645, Issue 1 https://doi.org/10.1016/S0375-9474(98)00572-7	journal	January 1999
Pair production and bremsstrahlung of charged leptons Tsai, Yung-Su Reviews of Modern Physics, Vol. 46, Issue 4 https://doi.org/10.1103/RevModPhys.46.815	journal	October 1974
Scaling study of the pion electroproduction cross sections Horn, T.; Qian, X.; Arrington, J. Physical Review C, Vol. 78, Issue 5 https://doi.org/10.1103/PhysRevC.78.058201	journal	November 2008
Deep exclusive π+ electroproduction off the proton at CLAS Park, K.; Guidal, M.; Gothe, R. W. The European Physical Journal A, Vol. 49, Issue 1 https://doi.org/10.1140/epja/i2013-13016-9	journal	January 2013
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
Experimental study of the $A$ ( $e$ , $e^{'} π^{+}$ ) reaction on ${}^{1}H$ , ${}^{2}H$ , ${}^{12}C$ , ${}^{27}{Al}$ , ${}^{63}{Cu}$ , and ${}^{197}{Au}$ Qian, X.; Horn, T.; Clasie, B. Physical Review C, Vol. 81, Issue 5 https://doi.org/10.1103/PhysRevC.81.055209	journal	May 2010
Single and double spin asymmetries for deeply virtual Compton scattering measured with CLAS and a longitudinally polarized proton target Pisano, S.; Biselli, A.; Niccolai, S. Physical Review D, Vol. 91, Issue 5 https://doi.org/10.1103/PhysRevD.91.052014	journal	March 2015
Charged pion form factor between $Q^{2} = 0.60$ and 2.45 ${GeV}^{2}$ . I. Measurements of the cross section for the $^{1} H (e, e^{'} π^{+}) n$ reaction Blok, H. P.; Horn, T.; Huber, G. M. Physical Review C, Vol. 78, Issue 4 https://doi.org/10.1103/PhysRevC.78.045202	journal	October 2008
Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction Aznauryan, I. G.; Burkert, V. D.; Biselli, A. S. Physical Review C, Vol. 80, Issue 5 https://doi.org/10.1103/PhysRevC.80.055203	journal	November 2009
Longitudinal Target-Spin Asymmetries for Deeply Virtual Compton Scattering Seder, E.; Biselli, A.; Pisano, S. Physical Review Letters, Vol. 114, Issue 3 https://doi.org/10.1103/PhysRevLett.114.032001	journal	January 2015
Regge description of charged pseudoscalar meson electroproduction above the resonance region Vanderhaeghen, M.; Guidal, M.; Laget, J. -M. Physical Review C, Vol. 57, Issue 3 https://doi.org/10.1103/PhysRevC.57.1454	journal	March 1998
First Measurement of the Double Spin Asymmetry in $\vec{e} \vec{p} \to e^{'} π^{+} n$ in the Resonance Region De Vita, R.; Anghinolfi, M.; Burkert, V. D. Physical Review Letters, Vol. 88, Issue 8 https://doi.org/10.1103/PhysRevLett.88.082001	journal	February 2002
A polarized target for the CLAS detector Keith, C. D.; Anghinolfi, M.; Battaglieri, M. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 501, Issue 2-3 https://doi.org/10.1016/S0168-9002(03)00429-7	journal	April 2003
Measurements of $e p \to e^{'} π^{+} n$ at $1.6 < W < 2.0$ GeV and extraction of nucleon resonance electrocouplings at CLAS Park, K.; Aznauryan, I. G.; Burkert, V. D. Physical Review C, Vol. 91, Issue 4 https://doi.org/10.1103/PhysRevC.91.045203	journal	April 2015
Precision measurements of $g_{1}$ of the proton and of the deuteron with 6 GeV electrons Prok, Y.; Bosted, P.; Kvaltine, N. Physical Review C, Vol. 90, Issue 2 https://doi.org/10.1103/PhysRevC.90.025212	journal	August 2014

Cited By (4)

The spin structure of the nucleon Deur, Alexandre; Brodsky, Stanley J.; de Téramond, Guy F. Reports on Progress in Physics, Vol. 82, Issue 7 https://doi.org/10.1088/1361-6633/ab0b8f	journal	June 2019
The spin structure of the nucleon Kabuss, Eva-Maria Czechoslovak Journal of Physics, Vol. 55, Issue S1 https://doi.org/10.1007/bf03031986	journal	January 2005
The spin structure of the nucleon Bass, S. D.; Thomas, A. W. Progress in Particle and Nuclear Physics, Vol. 33 https://doi.org/10.1016/0146-6410(94)90048-5	journal	January 1994
The Spin Structure of the Nucleon: Proceeding of International School of Nucleon Structure: 1st Course Frois, B.; Hughes, V. W.; de Groot, N. International School of Nucleon Structure, The Spin Structure of the Nucleon https://doi.org/10.1142/9789814529051	conference	April 2017