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

CLAS Collaboration

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

CLAS Collaboration

Physics

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

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
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	839
Early online date	13 Feb 2023
DOIs	https://doi.org/10.1016/j.physletb.2023.137761
Publication status	Published - 10 Apr 2023

Bibliographical note

Funding Information:
We acknowledge the outstanding efforts of the staff of the Accelerator and the Physics Divisions at Jefferson Lab in making this experiment possible. We owe much gratitude to P. Kroll for many fruitful discussions concerning the interpretation of our results. This work was supported in part by the U.S. Department of Energy , the National Science Foundation (NSF), the Italian Istituto Nazionale di Fisica Nucleare ( INFN ), the French Centre National de la Recherche Scientifique (CNRS), the French Commissariat pour l′Energie Atomique , the UK Science and Technology Facilities Council , the National Research Foundation ( NRF ) of Korea, the Helmholtz-Forschungsakademie Hessen für FAIR (HFHF), the Ministry of Science and Higher Education of the Russian Federation and the National Natural Science Foundation of China . The Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility for the U.S. Department of Energy under Contract No. DE-AC05-06OR23177.

Publisher Copyright:
© 2023 The Author(s)

Keywords

CLAS12
Eletroproduction
Exclusive single pion
GPD

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10.1016/j.physletb.2023.137761Licence: CC BY

A multidimensional study of the structure function ratio σLT /σ0 from hard exclusive π+ electro-production off protons in the GPD regime
© 2023 The Author(s).
Final published version, 1.29 MBLicence: CC BY

Cite this

@article{c108e671888b4fba94fa74b2f475a63e,

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 = "{CLAS Collaboration} and 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 S. Fegan and M. Nicol and Watts, {D. P.} and N. Zachariou",

note = "Funding Information: We acknowledge the outstanding efforts of the staff of the Accelerator and the Physics Divisions at Jefferson Lab in making this experiment possible. We owe much gratitude to P. Kroll for many fruitful discussions concerning the interpretation of our results. This work was supported in part by the U.S. Department of Energy , the National Science Foundation (NSF), the Italian Istituto Nazionale di Fisica Nucleare ( INFN ), the French Centre National de la Recherche Scientifique (CNRS), the French Commissariat pour l′Energie Atomique , the UK Science and Technology Facilities Council , the National Research Foundation ( NRF ) of Korea, the Helmholtz-Forschungsakademie Hessen f{\"u}r FAIR (HFHF), the Ministry of Science and Higher Education of the Russian Federation and the National Natural Science Foundation of China . The Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility for the U.S. Department of Energy under Contract No. DE-AC05-06OR23177. 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",

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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 - CLAS Collaboration

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 - Fegan, S.

AU - Nicol, M.

AU - Watts, D. P.

AU - Zachariou, N.

N1 - Funding Information: We acknowledge the outstanding efforts of the staff of the Accelerator and the Physics Divisions at Jefferson Lab in making this experiment possible. We owe much gratitude to P. Kroll for many fruitful discussions concerning the interpretation of our results. This work was supported in part by the U.S. Department of Energy , the National Science Foundation (NSF), the Italian Istituto Nazionale di Fisica Nucleare ( INFN ), the French Centre National de la Recherche Scientifique (CNRS), the French Commissariat pour l′Energie Atomique , the UK Science and Technology Facilities Council , the National Research Foundation ( NRF ) of Korea, the Helmholtz-Forschungsakademie Hessen für FAIR (HFHF), the Ministry of Science and Higher Education of the Russian Federation and the National Natural Science Foundation of China . The Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility for the U.S. Department of Energy under Contract No. DE-AC05-06OR23177. Publisher Copyright: © 2023 The Author(s)

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 - http://www.scopus.com/inward/record.url?scp=85148088633&partnerID=8YFLogxK

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

Abstract

Bibliographical note

Keywords

Access to Document

Other files and links

Nuclear Physics Consolidated Grant 2021-2024

Cite this

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

Abstract

Bibliographical note

Keywords

Access to Document

Other files and links

Projects

Nuclear Physics Consolidated Grant 2021-2024

Cite this

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