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.; Dodge, G.; Fersch, R.; Kuhn, S. E.; Pierce, J.; Prok, Y.; Zheng, X.; Adhikari, K. P.; Adikaram, D.; Akbar, Z.; Amaryan, M. J.; Pereira, S. Anefalos; Asryan, G.; Avakian, H.; Badui, R. A.; Ball, J.; Baltzell, N. A.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Boiarinov, S.; Briscoe, W. J.; Bültmann, S.; Burkert, V. D.; Cao, T.; Carman, D. S.; Celentano, A.; Chandavar, S.; Charles, G.; Chetry, T.; Ciullo, G.; Clark, L.; Colaneri, L.; Cole, P. L.; Contalbrigo, M.; Cortes, O.; Crede, V.; D'Angelo, A.; Dashyan, N.; De Vita, R.; Deur, A.; Djalali, C.; Dupre, R.; Egiyan, H.; Alaoui, A. El; Fassi, L. El; Eugenio, P.; Fanchini, E.; Fedotov, G.; Filippi, A.; Fleming, J. A.; Forest, T. A.; Fradi, A.; Garçon, M.; Gevorgyan, N.; Ghandilyan, Y.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Gleason, C.; Gohn, W.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guler, N.; Guo, L.; Hafidi, K.; Hanretty, C.; Harrison, N.; Hattawy, M.; Heddle, D.; Hicks, K.; Holtrop, M.; Hughes, S. M.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Jenkins, D.; Jiang, H.; Jo, H. S.; Joo, K.; Joosten, S.; Keller, D.; Khandaker, M.; Kim, W.; Klein, A.; Klein, F. J.; Kubarovsky, V.; Kuleshov, S. V.; Lanza, L.; Lenisa, P.; Livingston, K.; Lu, H. Y.; MacGregor, I . J . D.; Markov, N.; McCracken, M. E.; McKinnon, B.; Meyer, C. A.; Minehart, R.; Mirazita, M.; Mokeev, V.; Movsisyan, A; Munevar, E.; Camacho, C. Munoz; Nadel-Turonski, P.; Net, L. A.; Ni, A.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Osipenko, M.; Ostrovidov, A. I.; Paremuzyan, R.; Park, K.; Pasyuk, E.; Peng, P.; Phelps, W.; Pisano, S.; Pogorelko, O.; Price, J. W.; Procureur, S.; Protopopescu, D.; Puckett, A. J. R.; Raue, B. A.; Ripani, M.; Rizzo, A.; Rosner, G.; Rossi, P.; Roy, P.; Sabatié, F.; Salgado, C.; Schumacher, R. A.; Seder, E.; Sharabian, Y. G.; Simonyan, A.; Skorodumina, Iu.; Smith, G. D.; Sparveris, N.; Stankovic, Ivana; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Sytnik, V.; Taiuti, M.; Tian, Ye; Torayev, B.; Ungaro, M.; Voskanyan, H.; Voutier, E.; Walford, N. K.; Watts, D. P.; Wei, X.; Weinstein, L. B.; Wood, M. H.; Zachariou, N.; Zana, L.; Zhang, J.; Zhao, Z. W.; Zonta, I.

doi:10.48550/arxiv.1604.04350

Cited by 3 publications

(11 citation statements)

References 8 publications

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“…The present analysis closely follows that presented in Ref. [14]. After a summary of the formalism, details of the experimental setup, analysis, and results are presented in the following sections.…”

Section: Introduction a Physics Motivationmentioning

confidence: 76%

“…The "eg1-dvcs" experiment [16,17] took data in 2009, and had many similarities to an earlier experiment [14] which took data in 2000-2001. While the latter experiment was designed as a broad survey in W and Q 2 , using beam energies from 1.6 to 5.7 GeV, the present experiment was focused on a wide range of spin-dependent electroproduction reactions at large values of Q 2 , using the highest available beam energy at JLab.…”

Section: Methodsmentioning

confidence: 99%

“…While the latter experiment was designed as a broad survey in W and Q 2 , using beam energies from 1.6 to 5.7 GeV, the present experiment was focused on a wide range of spin-dependent electroproduction reactions at large values of Q 2 , using the highest available beam energy at JLab. Improvements in the beam parameters, target design, detector configuration, and data acquisition all combined to result in factors of four to five smaller statistical uncertainties for Q 2 > 1 GeV 2 compared to the earlier experiment [14]. A brief summary of the experimental setup is presented below:…”

Section: Methodsmentioning

confidence: 99%

“…The conventions used for θ * and φ * are given in Ref. [14]. The relationship between the present A LL and A U L observables and the cross section components used by the MAID group [15] are also given in Ref.…”

Section: Formalismmentioning

confidence: 99%

“…Beam asymmetries at large Q 2 for π + n electroproduction from a proton target were published from JLab for W < 1.7 GeV [6] and are also the subject of an early investigation for W > 2 GeV [12]. Beam-target asymmetries and target single-spin asymmetries for positive and negative pions were reported from the "eg1a" and "eg1b" experiments at Jefferson Lab [13,14] using 1.7 to 5.7 GeV electrons and a polarized ammonia target. The present experiment used 6 GeV electrons only, and greatly improves the statistical precision of exclusive positive pion electroproduction asymmetries for Q 2 > 1 GeV 2 .…”

Section: Introduction a Physics Motivationmentioning

confidence: 99%

See 4 more Smart Citations

Target and Beam-Target Spin Asymmetries in Exclusive Pion Electroproduction for $Q^2>1$ GeV$^2$. I. $e p \rightarrow e π^+ n$

Bosted,

Amaryan,

Pereira

et al. 2016

Preprint

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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 Lab. The kinematic range covered is 1.1 < W < 3 GeV and 1 < Q 2 < 6 GeV 2 . Results were obtained for about 6000 bins in W , Q 2 , 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 < 1.6GeV, but very large differences are seen at higher values of W . A GPD-based model is in poor agreement with the data. When combined with cross section measurements, the present results provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q 2 , for resonances with masses as high as 2.4 GeV.

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Section: Introduction a Physics Motivationmentioning

confidence: 76%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Formalismmentioning

confidence: 99%

Section: Introduction a Physics Motivationmentioning

confidence: 99%

See 3 more Smart Citations

Target and Beam-Target Spin Asymmetries in Exclusive Pion Electroproduction for $Q^2>1$ GeV$^2$. I. $e p \rightarrow e π^+ n$

Bosted,

Amaryan,

Pereira

et al. 2016

Preprint

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Deeply virtual meson production on neutrons

Schmidt¹,

Siddikov²

2018

Phys. Rev. D

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In this paper we analyze in detail how the measurements of exclusive electroproduction of mesons on neutrons would complement the studies of generalized parton distributions (GPDs) of the proton, providing independent experimental observables. Some of these processes on neutrons have very distinctive features, and thus we expect that measurements on liquid deuterium would allow to clearly distinguish them from similar processes on protons, giving a very clean probe of the GPD. In the case of charged meson production, all produced hadrons are charged, and for this reason we expect that the kinematics of this process could be easily reconstructed. We estimate the crosssections in the kinematics of the Jefferson Laboratory experiments using current phenomenological GPD models.

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Measurement of Target and Double-spin Asymmetries for the $\vec e\vec p\to eπ^+ (n)$ Reaction in the Nucleon Resonance Region at Low $Q^2$

Zheng,

Adhikari,

Bosted

et al. 2016

Preprint

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We report measurements of target-and double-spin asymmetries for the exclusive channel e p → eπ + (n) in the nucleon resonance region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). These asymmetries were extracted from data obtained using a longitudinally polarized NH3 target and a longitudinally polarized electron beam with energies 1.1, 1.3, 2.0, 2.3 and 3.0 GeV. The new results are consistent with previous CLAS publications but are extended to a low Q 2 range from 0.0065 to 0.35 (GeV/c) 2 . The Q 2 access was made possible by a custom-built Cherenkov detector that allowed the detection of electrons for scattering angles as low as 6 • . These results are compared with the unitary isobar models JANR and MAID, the partial-wave analysis prediction from SAID and the dynamic model DMT. In many kinematic regions our results, in particular results on the target asymmetry, help to constrain the polarization-dependent components of these models.

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Target and Beam-Target Spin Asymmetries in Exclusive $π^+$ and $π^-$ Electroproduction with 1.6 to 5.7 GeV Electrons

Cited by 3 publications

References 8 publications

Target and Beam-Target Spin Asymmetries in Exclusive Pion Electroproduction for $Q^2>1$ GeV$^2$. I. $e p \rightarrow e π^+ n$

Target and Beam-Target Spin Asymmetries in Exclusive Pion Electroproduction for $Q^2>1$ GeV$^2$. I. $e p \rightarrow e π^+ n$

Deeply virtual meson production on neutrons

Measurement of Target and Double-spin Asymmetries for the $\vec e\vec p\to eπ^+ (n)$ Reaction in the Nucleon Resonance Region at Low $Q^2$

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