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27 April 2024

» arxiv » 2210.14557

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A multidimensional study of the structure function ratio $σ_{LT'}/σ_{0}$ from hard exclusive $π^+$ electro-production off protons in the GPD regime
S. Diehl ; A. Kim ; K. Joo ; P. Achenbach ; Z. Akbar ; M.J. Amaryan ; H. Atac ; H. Avagyan ; C. Ayerbe Gayoso ; L. Baashen ; L. Barion ; M. Bashkanov ; M. Battaglieri ; I. Bedlinskiy ; B. Benkel ; F. Benmokhtar ; A. Bianconi ; A.S. Biselli ; M. Bondi ; W.A. Booth ; F. Bossu ; S. Boiarinov ; K.-Th. Brinkmann ; W.J. Briscoe ; S. Bueltmann ; D. Bulumulla ; V.D. Burkert ; D.S. Carman ; A. Celentano ; P. Chatagnon ; V. Chesnokov ; T. Chetry ; G. Ciullo ; G. Clash ; P.L. Cole ; M. Contalbrigo ; G. Costantini ; A. D'Angelo ; N. Dashyan ; R. De Vita ; M. Defurne ; A. Deur ; C. Djalali ; R. Dupre ; H. Egiyan ; M. Ehrhart ; A. El Alaoui ; L. El Fassi ; L. Elouadrhiri ; S. Fegan ; A. Filippi ; G. Gavalian ; Y. Ghandilyan ; G.P. Gilfoyle ; D.I. Glazier ; A.A. Golubenko ; G. Gosta ; R.W. Gothe ; Y. Gotra ; K.A. Grifoen ; M. Guidal ; K. Hafdi ; H. Hakobyan ; M. Hattawy ; T.B. Hayward ; D. Heddle ; A. Hobart ; M. Holtrop ; Y. Ilieva ; D.G. Ireland ; E.L. Isupov ; H.S. Jo ; M. Khachatryan ; A. Khanal ; W. Kim ; A. Kripko ; V. Kubarovsky ; V. Lagerquist ; J.-M. Laget ; L. Lanza ; M. Leali ; S. Lee ; P. Lenisa ; X. Li ; K. Livingston ; I .J. D. MacGregor ; D. Marchand ; V. Mascagna ; B. McKinnon ; Z.E. Meziani ; S. Migliorati ; T. Mineeva ; M. Mirazita ; V. Mokeev ; Esteban Molina ; R.A. Montgomery ; C. Munoz Camacho ; P. Nadel-Turonski ; P. Naidoo ; K. Neupane ; S. Niccolai ; M. Nicol ; G. Niculescu ; M. Osipenko ; M. Ouillon ; P. Pandey ; M. Paolone ; L.L. Pappalardo ; R. Paremuzyan ; E. Pasyuk ; S.J. Paul ; W. Phelps ; N. Pilleux ; M. Pokhrel ; J. Poudel ; J.W. Price ; Y. Prok ; Trevor Reed ; J. Richards ; M. Ripani ; J. Ritman ; P. Rossi ; F. Sabatie ; C. Salgado ; S. Schadmand ; A. Schmidt ; Y. Sharabian ; E.V. Shirokov ; U. Shrestha ; P. Simmerling ; D. Sokhan ; N. Sparveris ; M. Spreafco ; S. Stepanyan ; I.I. Strakovsky ; S. Strauch ; J.A. Tan ; N. Trotta ; M. Turisini ; R. Tyson ; M. Ungaro ; S. Vallarino ; L. Venturelli ; H. Voskanyan ; E. Voutier ; D.P. Watts ; X. Wei ; R. Williams ; R. Wishart ; M.H. Wood ; N. Zachariou ; J. Zhang ; Z.W. Zhao ; M. Zurek ;
Date:	26 Oct 2022
Abstract:	A multidimensional extraction of the structure function ratio $sigma_{LT’}/sigma_{0}$ from the hard exclusive $vec{e} p o e^prime n pi^+$ reaction above the resonance region has been performed. The study was done based on beam-spin asymmetry measurements using a 10.6 GeV incident electron beam on a liquid-hydrogen target and the CLAS12 spectrometer at Jefferson Lab. The measurements focus on the very forward regime ($t/Q^{2}$ $ll$ 1) with a wide kinematic range of $x_{B}$ in the valence regime (0.17 $<$ $x_{B}$ $<$ 0.55), and virtualities $Q^{2}$ ranging from 1.5 GeV$^{2}$ up to 6 GeV$^{2}$. The results and their comparison to theoretical models based on Generalized Parton Distributions demonstrate the sensitivity to chiral-odd GPDs and the directly related tensor charge of the nucleon. In addition, the data is compared to an extension of a Regge formalism at high photon virtualities. It was found that the Regge model provides a better description at low $Q^{2}$, while the GPD model is more appropriate at high $Q^{2}$.
Source:	arXiv, 2210.14557
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