A multidimensional study of the structure function ratio σLT′/σ0 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. Bossù; 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. Griffioen; M. Guidal; K. Hafidi; 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; E. 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; T. Reed; J. Richards; M. Ripani; J. Ritman; P. Rossi; F. Sabatié; C. Salgado; S. Schadmand; A. Schmidt; Y. Sharabian; E. V. Shirokov; U. Shrestha; P. Simmerling; D. Sokhan; N. Sparveris; M. Spreafico; 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

doi:10.1016/j.physletb.2023.137761

A multidimensional study of the structure function ratio σ_LT^′/σ₀ 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. Bossù, 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. Griffioen, M. Guidal, K. Hafidi, 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, E. 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, T. Reed, J. Richards, M. Ripani, J. Ritman, P. Rossi, F. Sabatié, C. Salgado, S. Schadmand, A. Schmidt, Y. Sharabian, E. V. Shirokov, U. Shrestha, P. Simmerling, D. Sokhan, N. Sparveris, M. Spreafico, 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

University of Connecticut
Justus Liebig University Giessen
Thomas Jefferson National Accelerator Facility
Florida State University
University of Virginia
Old Dominion University
Temple University
College of William and Mary
Florida International University
National Institute for Nuclear Physics
University of York
Russian Research Centre Kurchatov Institute
Universidad Técnica Federico Santa Maria
Duquesne University
University of Brescia
Fairfield University
Université Paris-Saclay
George Washington University
CNRS/IN2P3
Lomonosov Moscow State University
Mississippi State University
Ohio University
University of Ferrara
Lamar University
University of Rome Tor Vergata
A. Alikhanian Yerevan Institute of Physics
University of South Carolina
University of Richmond
University of Glasgow
Argonne National Laboratory
Christopher Newport University
University of New Hampshire
Kyungpook National University
Massachusetts Institute of Technology
James Madison University
New Mexico State University
University of California at Riverside
California State University Dominguez Hills
GSI Helmholtz Centre for Heavy Ion Research
Jülich Research Centre
Norfolk State University
Canisius College
Duke University

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

A multidimensional extraction of the structure function ratio σ_LT^′/σ₀ from the hard exclusive e→p→e^′nπ⁺ 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/Q² ≪ 1) with a wide kinematic range of x_B in the valence regime (0.17 < x_B < 0.55), and virtualities Q² ranging from 1.5 GeV² up to 6 GeV². 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 Q², while the GPD model is more appropriate at high Q².

Original language	English
Article number	137761
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	839
DOIs	https://doi.org/10.1016/j.physletb.2023.137761
State	Published - 10 Apr 2023

Keywords

CLAS12
Eletroproduction
Exclusive single pion
GPD

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10.1016/j.physletb.2023.137761

Cite this

Diehl, S., Kim, A., Joo, K., Achenbach, P., Akbar, Z., Amaryan, M. J., Atac, H., Avagyan, H., Ayerbe Gayoso, C., Baashen, L., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Benkel, B., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bondi, M., ... Zurek, M. (2023). A multidimensional study of the structure function ratio σ_LT^′/σ₀ from hard exclusive π⁺ electro-production off protons in the GPD regime. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 839, Article 137761. https://doi.org/10.1016/j.physletb.2023.137761

@article{135d63a6f4da40bfb3be00c6e5999019,

title = "A multidimensional study of the structure function ratio σLT′/σ0 from hard exclusive π+ electro-production off protons in the GPD regime",

abstract = "A multidimensional extraction of the structure function ratio σLT′/σ0 from the hard exclusive e→p→e′nπ+ 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/Q2 ≪ 1) with a wide kinematic range of xB in the valence regime (0.17 < xB < 0.55), and virtualities Q2 ranging from 1.5 GeV2 up to 6 GeV2. 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 Q2, while the GPD model is more appropriate at high Q2.",

keywords = "CLAS12, Eletroproduction, Exclusive single pion, GPD",

author = "S. Diehl and A. Kim and K. Joo and P. Achenbach and Z. Akbar and Amaryan, \{M. J.\} and H. Atac and H. Avagyan and \{Ayerbe Gayoso\}, C. and L. Baashen and L. Barion and M. Bashkanov and M. Battaglieri and I. Bedlinskiy and B. Benkel and F. Benmokhtar and A. Bianconi and Biselli, \{A. S.\} and M. Bondi and Booth, \{W. A.\} and F. Boss{\`u} and S. Boiarinov and Brinkmann, \{K. Th\} and Briscoe, \{W. J.\} and S. Bueltmann and D. Bulumulla and Burkert, \{V. D.\} and Carman, \{D. S.\} and A. Celentano and P. Chatagnon and V. Chesnokov and T. Chetry and G. Ciullo and G. Clash and Cole, \{P. L.\} and M. Contalbrigo and G. Costantini and A. D'Angelo and N. Dashyan and \{De Vita\}, R. and M. Defurne and A. Deur and C. Djalali and R. Dupre and H. Egiyan and M. Ehrhart and \{El Alaoui\}, A. and \{El Fassi\}, L. and L. Elouadrhiri and S. Fegan and A. Filippi and G. Gavalian and Y. Ghandilyan and Gilfoyle, \{G. P.\} and Glazier, \{D. I.\} and Golubenko, \{A. A.\} and G. Gosta and Gothe, \{R. W.\} and Y. Gotra and Griffioen, \{K. A.\} and M. Guidal and K. Hafidi and H. Hakobyan and M. Hattawy and Hayward, \{T. B.\} and D. Heddle and A. Hobart and M. Holtrop and Y. Ilieva and Ireland, \{D. G.\} and Isupov, \{E. L.\} and Jo, \{H. S.\} and M. Khachatryan and A. Khanal and W. Kim and A. Kripko and V. Kubarovsky and V. Lagerquist and Laget, \{J. M.\} and L. Lanza and M. Leali and S. Lee and P. Lenisa and X. Li and K. Livingston and \{J.D. MacGregor\}, I. and D. Marchand and V. Mascagna and B. McKinnon and Meziani, \{Z. E.\} and S. Migliorati and T. Mineeva and M. Mirazita and V. Mokeev and E. Molina and Montgomery, \{R. A.\} and \{Munoz Camacho\}, C. and P. Nadel-Turonski and P. Naidoo and K. Neupane and S. Niccolai and M. Nicol and G. Niculescu and M. Osipenko and M. Ouillon and P. Pandey and M. Paolone and Pappalardo, \{L. L.\} and R. Paremuzyan and E. Pasyuk and Paul, \{S. J.\} and W. Phelps and N. Pilleux and M. Pokhrel and J. Poudel and Price, \{J. W.\} and Y. Prok and T. Reed and J. Richards and M. Ripani and J. Ritman and P. Rossi and F. Sabati{\'e} and C. Salgado and S. Schadmand and A. Schmidt and Y. Sharabian and Shirokov, \{E. V.\} and U. Shrestha and P. Simmerling and D. Sokhan and N. Sparveris and M. Spreafico and S. Stepanyan and Strakovsky, \{I. I.\} and S. Strauch and Tan, \{J. A.\} and N. Trotta and M. Turisini and R. Tyson and M. Ungaro and S. Vallarino and L. Venturelli and H. Voskanyan and E. Voutier and Watts, \{D. P.\} and X. Wei and R. Williams and R. Wishart and Wood, \{M. H.\} and N. Zachariou and J. Zhang and Zhao, \{Z. W.\} and M. Zurek",

note = "Publisher Copyright: {\textcopyright} 2023 The Author(s)",

year = "2023",

month = apr,

day = "10",

doi = "10.1016/j.physletb.2023.137761",

language = "English",

volume = "839",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

Diehl, S, Kim, A, Joo, K, Achenbach, P, Akbar, Z, Amaryan, MJ, Atac, H, Avagyan, H, Ayerbe Gayoso, C, Baashen, L, Barion, L, Bashkanov, M, Battaglieri, M, Bedlinskiy, I, Benkel, B, Benmokhtar, F, Bianconi, A, Biselli, AS, Bondi, M, Booth, WA, Bossù, F, Boiarinov, S, Brinkmann, KT, Briscoe, WJ, Bueltmann, S, Bulumulla, D, Burkert, VD, Carman, DS, Celentano, A, Chatagnon, P, Chesnokov, V, Chetry, T, Ciullo, G, Clash, G, Cole, PL, Contalbrigo, M, Costantini, G, D'Angelo, A, Dashyan, N, De Vita, R, Defurne, M, Deur, A, Djalali, C, Dupre, R, Egiyan, H, Ehrhart, M, El Alaoui, A, El Fassi, L, Elouadrhiri, L, Fegan, S, Filippi, A, Gavalian, G, Ghandilyan, Y, Gilfoyle, GP, Glazier, DI, Golubenko, AA, Gosta, G, Gothe, RW, Gotra, Y, Griffioen, KA, Guidal, M, Hafidi, K, Hakobyan, H, Hattawy, M, Hayward, TB, Heddle, D, Hobart, A, Holtrop, M, Ilieva, Y, Ireland, DG, Isupov, EL, Jo, HS, Khachatryan, M, Khanal, A, Kim, W, Kripko, A, Kubarovsky, V, Lagerquist, V, Laget, JM, Lanza, L, Leali, M, Lee, S, Lenisa, P, Li, X, Livingston, K, J.D. MacGregor, I, Marchand, D, Mascagna, V, McKinnon, B, Meziani, ZE, Migliorati, S, Mineeva, T, Mirazita, M, Mokeev, V, Molina, E, Montgomery, RA, Munoz Camacho, C, Nadel-Turonski, P, Naidoo, P, Neupane, K, Niccolai, S, Nicol, M, Niculescu, G, Osipenko, M, Ouillon, M, Pandey, P, Paolone, M, Pappalardo, LL, Paremuzyan, R, Pasyuk, E, Paul, SJ, Phelps, W, Pilleux, N, Pokhrel, M, Poudel, J, Price, JW, Prok, Y, Reed, T, Richards, J, Ripani, M, Ritman, J, Rossi, P, Sabatié, F, Salgado, C, Schadmand, S, Schmidt, A, Sharabian, Y, Shirokov, EV, Shrestha, U, Simmerling, P, Sokhan, D, Sparveris, N, Spreafico, M, Stepanyan, S, Strakovsky, II, Strauch, S, Tan, JA, Trotta, N, Turisini, M, Tyson, R, Ungaro, M, Vallarino, S, Venturelli, L, Voskanyan, H, Voutier, E, Watts, DP, Wei, X, Williams, R, Wishart, R, Wood, MH, Zachariou, N, Zhang, J, Zhao, ZW & Zurek, M 2023, 'A multidimensional study of the structure function ratio σ_LT^′/σ₀ from hard exclusive π⁺ electro-production off protons in the GPD regime', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 839, 137761. https://doi.org/10.1016/j.physletb.2023.137761

TY - JOUR

T1 - A multidimensional study of the structure function ratio σLT′/σ0 from hard exclusive π+ electro-production off protons in the GPD regime

AU - Diehl, S.

AU - Kim, A.

AU - Joo, K.

AU - Achenbach, P.

AU - Akbar, Z.

AU - Amaryan, M. J.

AU - Atac, H.

AU - Avagyan, H.

AU - Ayerbe Gayoso, C.

AU - Baashen, L.

AU - Barion, L.

AU - Bashkanov, M.

AU - Battaglieri, M.

AU - Bedlinskiy, I.

AU - Benkel, B.

AU - Benmokhtar, F.

AU - Bianconi, A.

AU - Biselli, A. S.

AU - Bondi, M.

AU - Booth, W. A.

AU - Bossù, F.

AU - Boiarinov, S.

AU - Brinkmann, K. Th

AU - Briscoe, W. J.

AU - Bueltmann, S.

AU - Bulumulla, D.

AU - Burkert, V. D.

AU - Carman, D. S.

AU - Celentano, A.

AU - Chatagnon, P.

AU - Chesnokov, V.

AU - Chetry, T.

AU - Ciullo, G.

AU - Clash, G.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - Costantini, G.

AU - D'Angelo, A.

AU - Dashyan, N.

AU - De Vita, R.

AU - Defurne, M.

AU - Deur, A.

AU - Djalali, C.

AU - Dupre, R.

AU - Egiyan, H.

AU - Ehrhart, M.

AU - El Alaoui, A.

AU - El Fassi, L.

AU - Elouadrhiri, L.

AU - Fegan, S.

AU - Filippi, A.

AU - Gavalian, G.

AU - Ghandilyan, Y.

AU - Gilfoyle, G. P.

AU - Glazier, D. I.

AU - Golubenko, A. A.

AU - Gosta, G.

AU - Gothe, R. W.

AU - Gotra, Y.

AU - Griffioen, K. A.

AU - Guidal, M.

AU - Hafidi, K.

AU - Hakobyan, H.

AU - Hattawy, M.

AU - Hayward, T. B.

AU - Heddle, D.

AU - Hobart, A.

AU - Holtrop, M.

AU - Ilieva, Y.

AU - Ireland, D. G.

AU - Isupov, E. L.

AU - Jo, H. S.

AU - Khachatryan, M.

AU - Khanal, A.

AU - Kim, W.

AU - Kripko, A.

AU - Kubarovsky, V.

AU - Lagerquist, V.

AU - Laget, J. M.

AU - Lanza, L.

AU - Leali, M.

AU - Lee, S.

AU - Lenisa, P.

AU - Li, X.

AU - Livingston, K.

AU - J.D. MacGregor, I.

AU - Marchand, D.

AU - Mascagna, V.

AU - McKinnon, B.

AU - Meziani, Z. E.

AU - Migliorati, S.

AU - Mineeva, T.

AU - Mirazita, M.

AU - Mokeev, V.

AU - Molina, E.

AU - Montgomery, R. A.

AU - Munoz Camacho, C.

AU - Nadel-Turonski, P.

AU - Naidoo, P.

AU - Neupane, K.

AU - Niccolai, S.

AU - Nicol, M.

AU - Niculescu, G.

AU - Osipenko, M.

AU - Ouillon, M.

AU - Pandey, P.

AU - Paolone, M.

AU - Pappalardo, L. L.

AU - Paremuzyan, R.

AU - Pasyuk, E.

AU - Paul, S. J.

AU - Phelps, W.

AU - Pilleux, N.

AU - Pokhrel, M.

AU - Poudel, J.

AU - Price, J. W.

AU - Prok, Y.

AU - Reed, T.

AU - Richards, J.

AU - Ripani, M.

AU - Ritman, J.

AU - Rossi, P.

AU - Sabatié, F.

AU - Salgado, C.

AU - Schadmand, S.

AU - Schmidt, A.

AU - Sharabian, Y.

AU - Shirokov, E. V.

AU - Shrestha, U.

AU - Simmerling, P.

AU - Sokhan, D.

AU - Sparveris, N.

AU - Spreafico, M.

AU - Stepanyan, S.

AU - Strakovsky, I. I.

AU - Strauch, S.

AU - Tan, J. A.

AU - Trotta, N.

AU - Turisini, M.

AU - Tyson, R.

AU - Ungaro, M.

AU - Vallarino, S.

AU - Venturelli, L.

AU - Voskanyan, H.

AU - Voutier, E.

AU - Watts, D. P.

AU - Wei, X.

AU - Williams, R.

AU - Wishart, R.

AU - Wood, M. H.

AU - Zachariou, N.

AU - Zhang, J.

AU - Zhao, Z. W.

AU - Zurek, M.

PY - 2023/4/10

Y1 - 2023/4/10

N2 - A multidimensional extraction of the structure function ratio σLT′/σ0 from the hard exclusive e→p→e′nπ+ 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/Q2 ≪ 1) with a wide kinematic range of xB in the valence regime (0.17 < xB < 0.55), and virtualities Q2 ranging from 1.5 GeV2 up to 6 GeV2. 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 Q2, while the GPD model is more appropriate at high Q2.

AB - A multidimensional extraction of the structure function ratio σLT′/σ0 from the hard exclusive e→p→e′nπ+ 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/Q2 ≪ 1) with a wide kinematic range of xB in the valence regime (0.17 < xB < 0.55), and virtualities Q2 ranging from 1.5 GeV2 up to 6 GeV2. 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 Q2, while the GPD model is more appropriate at high Q2.

KW - CLAS12

KW - Eletroproduction

KW - Exclusive single pion

KW - GPD

UR - https://www.scopus.com/pages/publications/85148088633

U2 - 10.1016/j.physletb.2023.137761

DO - 10.1016/j.physletb.2023.137761

M3 - Article

AN - SCOPUS:85148088633

SN - 0370-2693

VL - 839

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 137761

ER -

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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