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A multidimensional study of the structure function ratio σ_(LT')/σ₀ from hard exclusive π^+ electro-production off protons in the GPD regime

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arxiv 2210.14557 v2 pith:5T5U645C submitted 2022-10-26 hep-ex

A multidimensional study of the structure function ratio $\sigma_{LT'}/\sigma_{0}$ from hard exclusive $\pi^+$ 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
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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
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abstract

A multidimensional extraction of the structure function ratio $\sigma_{LT'}/\sigma_{0}$ from the hard exclusive $\vec{e} p \to e^\prime n \pi^+$ 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 $Q^{2}$.

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