Beam charge asymmetries for deeply virtual Compton scattering off the proton

The CLAS Collaboration

doi:10.1140/epja/s10050-021-00474-z

Beam charge asymmetries for deeply virtual Compton scattering off the proton

The CLAS Collaboration

Physics and Astronomy

Thomas Jefferson National Accelerator Facility
University of Connecticut
Université Paris-Saclay
George Washington University
National Institute for Nuclear Physics
University of Brescia
Mississippi State University
University of Ferrara
Lamar University
Justus Liebig University Giessen
University of Virginia
Idaho State University
Michigan State University
Old Dominion University
University of Glasgow

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

22 Scopus citations

Abstract

The unpolarized and polarized Beam Charge Asymmetries (BCAs) of the e→ ^±p→ e^±pγ process off unpolarized hydrogen are discussed. The measurement of BCAs with the CLAS12 spectrometer at the Thomas Jefferson National Accelerator Facility, using polarized positron and electron beams at 10.6 GeV is investigated. This experimental configuration allows to measure azimuthal and t-dependences of the unpolarized and polarized BCAs over a large (x_B, Q²) phase space, providing a direct access to the real part of the Compton Form Factor (CFF) H. Additionally, these measurements confront the Bethe-Heitler dominance hypothesis and eventual effects beyond leading twist. The impact of potential positron beam data on the determination of CFFs is also investigated within a local fitting approach of experimental observables. Positron data are shown to strongly reduce correlations between CFFs and consequently improve significantly the determination of Re [H].

Original language	English
Article number	186
Journal	European Physical Journal A
Volume	57
Issue number	6
DOIs	https://doi.org/10.1140/epja/s10050-021-00474-z
State	Published - Jun 2021

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10.1140/epja/s10050-021-00474-z

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@article{880ba370c9f24f7ea5c90d667dd8452d,

title = "Beam charge asymmetries for deeply virtual Compton scattering off the proton",

abstract = "The unpolarized and polarized Beam Charge Asymmetries (BCAs) of the e→ ±p→ e±pγ process off unpolarized hydrogen are discussed. The measurement of BCAs with the CLAS12 spectrometer at the Thomas Jefferson National Accelerator Facility, using polarized positron and electron beams at 10.6 GeV is investigated. This experimental configuration allows to measure azimuthal and t-dependences of the unpolarized and polarized BCAs over a large (xB, Q2) phase space, providing a direct access to the real part of the Compton Form Factor (CFF) H. Additionally, these measurements confront the Bethe-Heitler dominance hypothesis and eventual effects beyond leading twist. The impact of potential positron beam data on the determination of CFFs is also investigated within a local fitting approach of experimental observables. Positron data are shown to strongly reduce correlations between CFFs and consequently improve significantly the determination of Re [H].",

author = "\{The CLAS Collaboration\} and V. Burkert and L. Elouadrhiri and Girod, \{F. X.\} and S. Niccolai and E. Voutier and A. Afanasev and L. Barion and M. Battaglieri and Bernauer, \{J. C.\} and A. Bianconi and R. Capobianco and M. Caudron and L. Causse and P. Chatagnon and T. Chetry and G. Ciullo and Cole, \{P. L.\} and M. Contalbrigo and G. Costantini and M. Defurne and A. Deur and S. Diehl and R. Dupr{\'e} and M. Ehrhart and Fernando, \{I. P.\} and A. Filippi and T. Forest and J. Grames and P. Gueye and S. Habet and D. Higinbotham and A. Hobart and Hyde, \{C. E.\} and K. Joo and A. Kim and V. Klimenko and Ko, \{H. S.\} and V. Kubarovsky and M. Leali and P. Lenisa and D. Marchand and V. Mascagna and M. McCaughan and B. McKinnon and A. Movsisyan and \{Mu{\~n}oz Camacho\}, C. and L. Pappalardo and E. Pasyuk and M. Poelker and K. Price",

note = "Publisher Copyright: {\textcopyright} 2021, The Author(s), under exclusive licence to Societ{\`a} Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.",

year = "2021",

month = jun,

doi = "10.1140/epja/s10050-021-00474-z",

language = "English",

volume = "57",

journal = "European Physical Journal A",

issn = "1434-6001",

number = "6",

}

TY - JOUR

T1 - Beam charge asymmetries for deeply virtual Compton scattering off the proton

AU - The CLAS Collaboration

AU - Burkert, V.

AU - Elouadrhiri, L.

AU - Girod, F. X.

AU - Niccolai, S.

AU - Voutier, E.

AU - Afanasev, A.

AU - Barion, L.

AU - Battaglieri, M.

AU - Bernauer, J. C.

AU - Bianconi, A.

AU - Capobianco, R.

AU - Caudron, M.

AU - Causse, L.

AU - Chatagnon, P.

AU - Chetry, T.

AU - Ciullo, G.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - Costantini, G.

AU - Defurne, M.

AU - Deur, A.

AU - Diehl, S.

AU - Dupré, R.

AU - Ehrhart, M.

AU - Fernando, I. P.

AU - Filippi, A.

AU - Forest, T.

AU - Grames, J.

AU - Gueye, P.

AU - Habet, S.

AU - Higinbotham, D.

AU - Hobart, A.

AU - Hyde, C. E.

AU - Joo, K.

AU - Kim, A.

AU - Klimenko, V.

AU - Ko, H. S.

AU - Kubarovsky, V.

AU - Leali, M.

AU - Lenisa, P.

AU - Marchand, D.

AU - Mascagna, V.

AU - McCaughan, M.

AU - McKinnon, B.

AU - Movsisyan, A.

AU - Muñoz Camacho, C.

AU - Pappalardo, L.

AU - Pasyuk, E.

AU - Poelker, M.

AU - Price, K.

PY - 2021/6

Y1 - 2021/6

N2 - The unpolarized and polarized Beam Charge Asymmetries (BCAs) of the e→ ±p→ e±pγ process off unpolarized hydrogen are discussed. The measurement of BCAs with the CLAS12 spectrometer at the Thomas Jefferson National Accelerator Facility, using polarized positron and electron beams at 10.6 GeV is investigated. This experimental configuration allows to measure azimuthal and t-dependences of the unpolarized and polarized BCAs over a large (xB, Q2) phase space, providing a direct access to the real part of the Compton Form Factor (CFF) H. Additionally, these measurements confront the Bethe-Heitler dominance hypothesis and eventual effects beyond leading twist. The impact of potential positron beam data on the determination of CFFs is also investigated within a local fitting approach of experimental observables. Positron data are shown to strongly reduce correlations between CFFs and consequently improve significantly the determination of Re [H].

AB - The unpolarized and polarized Beam Charge Asymmetries (BCAs) of the e→ ±p→ e±pγ process off unpolarized hydrogen are discussed. The measurement of BCAs with the CLAS12 spectrometer at the Thomas Jefferson National Accelerator Facility, using polarized positron and electron beams at 10.6 GeV is investigated. This experimental configuration allows to measure azimuthal and t-dependences of the unpolarized and polarized BCAs over a large (xB, Q2) phase space, providing a direct access to the real part of the Compton Form Factor (CFF) H. Additionally, these measurements confront the Bethe-Heitler dominance hypothesis and eventual effects beyond leading twist. The impact of potential positron beam data on the determination of CFFs is also investigated within a local fitting approach of experimental observables. Positron data are shown to strongly reduce correlations between CFFs and consequently improve significantly the determination of Re [H].

UR - https://www.scopus.com/pages/publications/85107561331

U2 - 10.1140/epja/s10050-021-00474-z

DO - 10.1140/epja/s10050-021-00474-z

M3 - Article

AN - SCOPUS:85107561331

SN - 1434-6001

VL - 57

JO - European Physical Journal A

JF - European Physical Journal A

IS - 6

M1 - 186

ER -

Beam charge asymmetries for deeply virtual Compton scattering off the proton

Abstract

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