Hard exclusive pion electroproduction at backward angles with CLAS

Park, Kijun; Guidal, M.; Gothe, R. W.; Pire, B.; Semenov-Tian-Shansky, K.; Laget, J. M.; Adhikari, K. P.; Adhikari, S.; Akbar, Z.; Avakian, H.; Ball, J.; Balossino, I.; Baltzell, N. A.; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Biselli, A. S.; Briscoe, W. J.; Brooks, W. K.; Burkert, Volker; Cao, F.; Carman, D. S.; Celentano, A.; Charles, G.; Chetry, T.; Ciullo, G.; Clark, L.; Cole, P. L.; Contalbrigo, M.; Credé, V.; D’Angelo, A.; Dashyan, N.; Vita, R. De; Sanctis, E. De; Defurne, M.; Deur, A.; Djalali, C.; Dupré, R.; Egiyan, H.; Alaoui, A. El; Fassi, L. El; Elouadrhiri, L.; Eugenio, P.; Fedotov, G.; Fersch, R.; Filippi, A.; Garçon, M.; Ghandilyan, Y.; Gilfoyle, G. P.; Girod, F. X.; Golovatch, E.; Griffioen, K. A.; Guo, L.; Hafidi, K.; Hakobyan, H.; Hanretty, C.; Harrison, N.; Hattawy, M.; Heddle, D.; Hicks, K.; Holtrop, M.; Hyde‐Wright, C. E.; Ilieva, Y.; Ireland, D. G.; Ишханов, Б. С.; Isupov, E. L.; Jenkins, David; Johnston, S.; Joo, K. S.; Kabir, Latiful; Keller, D.; Khachatryan, G.; Khachatryan, M.; Khandaker, M.; Kim, W.; Klein, F. J.; Kubarovsky, V.; Kuhn, S. E.; Lanza, L.; Livingston, K.; MacGregor, I. J. D.; Markov, N.; McKinnon, B.; Mirazita, M.; Mokeev, V.; Montgomery, R. A.; Camacho, C. Muñoz; Nadel-Turoński, P.; Niccolai, S.; Niculescu, G.; Osipenko, M.; Paolone, M.; Paremuzyan, R.; Pasyuk, E.; Phelps, W.; Pogorelko, O.; Poudel, J.; Price, J. W.; Prok, Y.; Protopopescu, D.; Ripani, M.; Rizzo, A.; Rossi, P.; Sabatié, F.; Salgado, C.; Schumacher, R. A.; Sharabian, Y. G.; Skorodumina, Iu.; Smith, G. D.; Sokhan, D.; Sparveris, N.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Tan, J. A.; Ungaro, M.; Voskanyan, H.; Voutier, E.; Wei, Xin; Zachariou, N.; Zhang, J.

doi:10.1016/j.physletb.2018.03.026

Cited by 24 publications

(26 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At Q 2 ¼ 2.45 GeV 2 , TDA predictions are within the same order of magnitude as the data, whereas at Q 2 ¼ 1.6 GeV 2 , the TDA model overpredicts the data by a factor of ∼10. This is very similar to the recent backward-angle π þ data from the CLAS Collaboration [17], where the TDA prediction is within 50% of the data at Q 2 ¼ 2.5 GeV 2 , but far higher than the unseparated data at Q 2 ¼ 1.7 GeV 2 . Together, datasets suggest that the boundary where the TDA factorization applies may begin around Q 2 ¼ 2.5 GeV 2 .…”

supporting

confidence: 88%

See 1 more Smart Citation

Unique Access to u -Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction

Li¹,

Huber²,

Blok³

et al. 2019

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

Backward-angle meson electroproduction above the resonance region, which was previously ignored, is anticipated to offer unique access to the three quark plus sea component of the nucleon wave function. In this Letter, we present the first complete separation of the four electromagnetic structure functions above the resonance region in exclusive ω electroproduction off the proton, ep → e 0 pω, at central Q 2 values of 1.60, 2.45 GeV 2 , at W ¼ 2.21 GeV. The results of our pioneering −u ≈ −u min study demonstrate the existence of a unanticipated backward-angle cross section peak and the feasibility of full L=T=LT=TT separations in this never explored kinematic territory. At Q 2 ¼ 2.45 GeV 2 , the observed dominance of σ T over σ L , is qualitatively consistent with the collinear QCD description in the near-backward

show abstract

supporting

confidence: 88%

“…In a recent publication [17], the CLAS Collaboration reported the first measurement of the cross sections for exclusive π þ electroproduction off the proton in nearbackward kinematics. The result gives promising signs of the predicted 1=Q 8 scaling of the cross section by TDA; however, the critical evidence for σ T dominance remains missing.…”

mentioning

confidence: 99%

Unique Access to u -Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction

Li¹,

Huber²,

Blok³

et al. 2019

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recent experimental studies [24,25,26] brought first evidences in favor of the validity of the reaction mechanism involving nucleon-to-meson TDAs for the description of backward pion or ω-electroproduction at JLab kinematical conditions. The perspective to access baryon-to-meson TDAs experimentally [27,28,29,30] rises a high demand for a consistent exposition of the considerable theoretical progress in the field achieved during the last two decades.…”

Section: Introductionmentioning

confidence: 99%

Transition distribution amplitudes and hard exclusive reactions with baryon number transfer

Pire,

Semenov-Tian-Shansky,

Szymanowski

2021

Preprint

Self Cite

View full text Add to dashboard Cite

Baryon-to-meson and baryon-to-photon transition distribution amplitudes (TDAs) arise in the collinear factorized description of a class of hard exclusive reactions characterized by the exchange of a non-zero baryon number in the cross channel. These TDAs extend the concepts of generalized parton distributions (GPDs) and baryon distribution amplitudes (DAs). In this review we discuss the general properties and physical interpretation of baryon-to-meson and baryon-to-photon TDAs. We argue that these nonperturbative objects are a convenient complementary tool to explore the structure of baryons at the partonic level. We present an overview of hard exclusive reactions admitting a description in terms of TDAs. We discuss the first signals from hard exclusive backward meson electroproduction at JLab with the 6 GeV electron beam and explore further experimental opportunities to access TDAs at JLab@12 GeV, PANDA and J-PARC.

show abstract

“…These predictions were validated by the cross section measurement of the exclusive backward π + electroproduction from CLAS [11] and the L/T separated ω cross section from Hall C [12] (both were JLab 6 GeV data). Based on these initial successes, a program to systematically study TDAs for a given reaction requires the following three stages:…”

Section: A Factorization Scheme In U-channel Kinematics Regimementioning

confidence: 76%

DIS2021 Workshop Proceedings: Backward-Angle (u-Channel) Meson Production from JLab 12 GeV Hall C to EIC

2021

Preprint

View full text Add to dashboard Cite

The recent exclusive backward-angle electroproduction of ω from Jefferson Lab Hall C electron-proton fixed-target scattering experiments above the resonance region hints at a new domain of applicability of QCD factorization in a unique u-channel kinematics regime. Thanks to this effort, the interest in studying nucleon structure through u-channel meson production observables has grown significantly. In the fixed target configuration, the uchannel meson electroproduction observables feature a unique interaction picture: the target proton absorbs nearly all momentum induced by virtual photons and recoils forward, while the produced mesons (such as omega or pions) are left behind almost at rest near the target station. In this presentation, We provide a summary of the key observations of the existing u-channel meson production results, update-to-date theory insights, and a path to further exploration from JLab 12 GeV Hall C program to the future Electron-Ion Colliders.

show abstract

Hard exclusive pion electroproduction at backward angles with CLAS

Cited by 24 publications

References 38 publications

Unique Access to u -Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction

Unique Access to u -Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction

Transition distribution amplitudes and hard exclusive reactions with baryon number transfer

DIS2021 Workshop Proceedings: Backward-Angle (u-Channel) Meson Production from JLab 12 GeV Hall C to EIC

Contact Info

Product

Resources

About