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.; Joo, K.; Kim, W.; Adhikari, K. P.; Akbar, Z.; Pereira, S. Anefalos; Badui, R. A.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Biselli, A. S.; Boiarinov, S.; Bosted, P.; Briscoe, W. J.; Brooks, W. K.; Bültmann, S.; Cao, T.; Carman, D. S.; Celentano, A.; Chandavar, S.; Charles, G.; Chetry, T.; Colaneri, L.; Cole, P. L.; Compton, N.; Contalbrigo, M.; Cortes, O.; Crede, V.; D'Angelo, A.; Dashyan, N.; De Vita, R.; De Sanctis, E.; Djalali, C.; Egiyan, H.; Alaoui, A. El; Fassi, L. El; Eugenio, P.; Fedotov, G.; Fersch, R.; Filippi, A.; Fleming, J. A.; Fradi, A.; Garçon, M.; Ghandilyan, Y.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Gohn, W.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guo, L.; Hafidi, K.; Hanretty, C.; Hattawy, M.; Heddle, D.; Hicks, K.; Holtrop, M.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Jenkins, D.; Jiang, H.; Jo, H. S.; Joosten, S.; Keller, D.; Khachatryan, G.; Khandaker, M.; Klein, A.; Klein, F. J.; Kubarovsky, V.; Kuhn, S. E.; Kuleshov, S. V.; Lanza, L.; Lenisa, P.; Lu, H. Y.; MacGregor, I . J . D.; Markov, N.; Mattione, P.; McCracken, M. E.; McKinnon, B.; Mokeev, V.; Movsisyan, A; Munevar, E.; Nadel-Turonski, P.; Net, L. A.; Niccolai, S.; Osipenko, M.; Ostrovidov, A. I.; Paolone, M.; Park, K.; Pasyuk, E.; Phelps, W.; Pisano, S.; Pogorelko, O.; Price, J. W.; Prok, Y.; Ripani, M.; Rizzo, A.; Rosner, G.; Rossi, P.; Roy, P.; Salgado, C.; Schumacher, R. A.; Seder, E.; Sharabian, Y. G.; Skorodumina, Iu.; Smith, G. D.; Sokhan, D.; Sparveris, N.; Stepanyan, S.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Sytnik, V.; Taiuti, M.; Torayev, B.; Ungaro, M.; Voskanyan, H.; Voutier, E.; Watts, D. P.; Wei, X.; Weinstein, L. B.; Zachariou, N.; Zana, L.; Zhang, J.; Zonta, I.

doi:10.48550/arxiv.1511.03338

Cited by 4 publications

(6 citation statements)

References 24 publications

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“…Ref. [10], for values of the final state invariant mass W above 2 GeV. The present analysis expands upon Ref.…”

Section: Introductionsupporting

confidence: 57%

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Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^2>1$ GeV$^2$. II. $e p \rightarrow e π^0 p$

Bosted,

Kim,

Adhikari

et al. 2016

Preprint

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Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive π 0 electroproduction reaction γ * p → pπ 0 , expanding an analysis of the γ * p → nπ + reaction from the same experiment. 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 5700 bins in W , Q 2 , cos(θ * ), and φ * . The beam-target asymmetries were found to generally be greater than zero, with relatively modest φ * dependence.The target asymmetries exhibit very strong φ * dependence, with a change in sign occurring between results at low W and high W , in contrast to π + electroproduction. Reasonable agreement is found with phenomenological fits to previous data for W < 1.6 GeV, but significant differences are seen at higher W . When combined with cross section measurements, as well as π + observables, the present results will 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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“…Ref. [10], for values of the final state invariant mass W above 2 GeV. The present analysis expands upon Ref.…”

Section: Introductionsupporting

confidence: 57%

“…The present analysis expands upon Ref. [10] to include W < 2 GeV and provide higher statistical precision for W > 2 GeV through the inclusion of additional final state topologies.…”

Section: Introductionmentioning

confidence: 91%

Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^2>1$ GeV$^2$. II. $e p \rightarrow e π^0 p$

Bosted,

Kim,

Adhikari

et al. 2016

Preprint

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“…The helicity correlation A LL can also be measured in pion electroproduction. In fact, the CLAS collaboration has measured it in the deeply virtual region [53]. In electroproduction there are two modulations of A LL .…”

Section: Helicity Correlations In Electroproductionmentioning

confidence: 99%

Wide-angle photo- and electroproduction of pions to twist-3 accuracy

Kroll,

Passek-Kumerički

2021

Preprint

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We investigate wide-angle photo-and electroproduction of pions within the handbag mechanism in which the γ ( * ) N → πN ′ amplitudes factorize into hard partonic subprocess amplitudes, γ ( * ) q → πq ′ , and form factors representing 1/x-moments of generalized parton distributions (GPDs). The subprocess is calculated to twist-3 accuracy taking into account the 2-and 3-body Fock components of the pion. Both components are required for achieving gauge invariance in QED and QCD. The twist-2 and twist-3 distribution amplitudes (DAs) of the pion as well as the form factors are taken from our study of π 0 photoproduction. Extensive results on photoproduction of charged pions are presented and compared to experiment. Predictions on electroproduction of pions as well as on spin effects are also given. As a byproduct of our analysis we also obtain the complete twist-3 subprocess amplitudes contributing to deeply-virtual electroproduction of pions.

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“…[47][48][49][50][51] from the analysis of various hadronic observables. It is worth noting that the Minkowskian momentum variable P 2 turns into the Euclidean form − P 2 E needed for the appropriate fall-off of the correlation function (10) in the Euclidean region. For given values of the size parameters Λ N , the coupling constant g N is determined by the compositeness condition suggested by Weinberg [52] and Salam [53] (for a review, see [54]), which is one of the key elements of our approach(for further details, see [55]).…”

Section: Formalismmentioning

confidence: 99%

“…T . As we point out before, chiral-odd GPDs together with chiral-even GPDs encode information about quark structure of the nucleon (the current status of the field is recently reviewed in [8], which are subject of extensive experimental study [from first measurements at DESY (HERA Collaboration) and JLab (CLAS Collaboration) [9,10] in the valence quark region to a comprehensive study at CERN (COMPASS Collaboration) [11] in the small-x sea quark and gluon region] and various theoretical analysis.). Next, the progress in the study of the GPDs have been done in many papers.…”

Section: Introductionmentioning

confidence: 99%

Nucleon tensor form factors in a relativistic confined quark model

et al. 2016

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We present results for the isotriplet and isosinglet tensor form factors of the nucleon in the relativistic confined quark model. The model allows us to calculate not only their normalizations at Q 2 = 0 and the related tensor charges, but also the full Q 2 -dependence. Our results are compared to existing data and predictions of other theoretical approaches. We stress the importance of these form factors for the phenomenology of physics beyond the Standard Model.

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Target and Double Spin Asymmetries of Deeply Virtual $π^0$ Production with a Longitudinally Polarized Proton Target and CLAS

Cited by 4 publications

References 24 publications

Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^2>1$ GeV$^2$. II. $e p \rightarrow e π^0 p$

Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^2>1$ GeV$^2$. II. $e p \rightarrow e π^0 p$

Wide-angle photo- and electroproduction of pions to twist-3 accuracy

Nucleon tensor form factors in a relativistic confined quark model

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