Measurement of the beam spin asymmetry of e→p→e′p′η in the deep-inelastic regime with CLAS

The CLAS Collaboration

doi:10.1016/j.physletb.2018.12.065

Measurement of the beam spin asymmetry of e→p→e^′p^′η in the deep-inelastic regime with CLAS

The CLAS Collaboration

Physics

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

Abstract

The beam spin asymmetry of the exclusive pseudoscalar channel e→p→e^′p^′η was measured for the first time in the deep-inelastic regime (W>2 GeV/c² and Q²>1 GeV²/c²) using a longitudinally polarized 5.78 GeV electron beam at Jefferson Lab with the CEBAF Large Acceptance Spectrometer. The data were accumulated in 144 four-dimensional bins of Q², x_B, −t and ϕ over a wide kinematic range, where ϕ is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the sin⁡ϕ moments is a clear indication of a substantial contribution to the polarized cross-section from transversely polarized virtual photons. In the framework of generalized parton distributions (GPDs) this contribution is expressed via longitudinal-transverse interference between chiral-even and chiral-odd GPDs. The experimental results are compared to the existing theoretical models demonstrating the sensitivity to the product of chiral-odd and chiral-even GPDs and provide new constraints to the existing GPD parameterizations.

Original language	English
Pages (from-to)	426-431
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	789
Early online date	3 Jan 2019
DOIs	https://doi.org/10.1016/j.physletb.2018.12.065
Publication status	Published - 10 Feb 2019

Bibliographical note

Keywords

Chiral-odd generalized parton distributions
CLAS collaboration
Deeply Virtual Meson Production
Nucleon structure

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10.1016/j.physletb.2018.12.065

1-s2.0-S0370269319300024-main
© 2019 The Authors.
Final published version, 412 KBLicence: CC BY

Cite this

@article{71d549d4005a4ebf98d526345dce268c,

title = "Measurement of the beam spin asymmetry of e→p→e′p′η in the deep-inelastic regime with CLAS",

abstract = "The beam spin asymmetry of the exclusive pseudoscalar channel e→p→e′p′η was measured for the first time in the deep-inelastic regime (W>2 GeV/c2 and Q2>1 GeV2/c2) using a longitudinally polarized 5.78 GeV electron beam at Jefferson Lab with the CEBAF Large Acceptance Spectrometer. The data were accumulated in 144 four-dimensional bins of Q2, xB, −t and ϕ over a wide kinematic range, where ϕ is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the sin⁡ϕ moments is a clear indication of a substantial contribution to the polarized cross-section from transversely polarized virtual photons. In the framework of generalized parton distributions (GPDs) this contribution is expressed via longitudinal-transverse interference between chiral-even and chiral-odd GPDs. The experimental results are compared to the existing theoretical models demonstrating the sensitivity to the product of chiral-odd and chiral-even GPDs and provide new constraints to the existing GPD parameterizations.",

keywords = "Chiral-odd generalized parton distributions, CLAS collaboration, Deeply Virtual Meson Production, Nucleon structure",

author = "{The CLAS Collaboration} and B. Zhao and A. Kim and K. Joo and I. Bedlinskiy and W. Kim and V. Kubarovsky and M. Ungaro and S. Adhikari and Z. Akbar and G. Angelini and H. Avakian and J. Ball and Baltzell, {N. A.} and L. Barion and M. Bashkanov and M. Battaglieri and V. Batourine and Biselli, {A. S.} and S. Boiarinov and Briscoe, {W. J.} and Brooks, {W. K.} and Burkert, {V. D.} and Carman, {D. S.} and A. Celentano and P. Chatagnon and T. Chetry and G. Ciullo and L. Clark and Clary, {B. A.} and Cole, {P. L.} and M. Contalbrigo and V. Crede and A. D'Angelo and N. Dashyan and {De Vita}, R. and {De Sanctis}, E. and M. Defurne and A. Deur and S. Diehl and C. Djalali and R. Dupre and H. Egiyan and M. Ehrhart and {El Alaoui}, A. and {El Fassi}, L. and P. Eugenio and A. Filippi and Forest, {T. A.} and G. Gavalian and N. Zachariou",

note = "{\textcopyright} 2019 The Authors.",

year = "2019",

month = feb,

day = "10",

doi = "10.1016/j.physletb.2018.12.065",

language = "English",

volume = "789",

pages = "426--431",

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

issn = "0370-2693",

publisher = "Elsevier",

}

TY - JOUR

T1 - Measurement of the beam spin asymmetry of e→p→e′p′η in the deep-inelastic regime with CLAS

AU - The CLAS Collaboration

AU - Zhao, B.

AU - Kim, A.

AU - Joo, K.

AU - Bedlinskiy, I.

AU - Kim, W.

AU - Kubarovsky, V.

AU - Ungaro, M.

AU - Adhikari, S.

AU - Akbar, Z.

AU - Angelini, G.

AU - Avakian, H.

AU - Ball, J.

AU - Baltzell, N. A.

AU - Barion, L.

AU - Bashkanov, M.

AU - Battaglieri, M.

AU - Batourine, V.

AU - Biselli, A. S.

AU - Boiarinov, S.

AU - Briscoe, W. J.

AU - Brooks, W. K.

AU - Burkert, V. D.

AU - Carman, D. S.

AU - Celentano, A.

AU - Chatagnon, P.

AU - Chetry, T.

AU - Ciullo, G.

AU - Clark, L.

AU - Clary, B. A.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - Crede, V.

AU - D'Angelo, A.

AU - Dashyan, N.

AU - De Vita, R.

AU - De Sanctis, E.

AU - Defurne, M.

AU - Deur, A.

AU - Diehl, S.

AU - Djalali, C.

AU - Dupre, R.

AU - Egiyan, H.

AU - Ehrhart, M.

AU - El Alaoui, A.

AU - El Fassi, L.

AU - Eugenio, P.

AU - Filippi, A.

AU - Forest, T. A.

AU - Gavalian, G.

AU - Zachariou, N.

PY - 2019/2/10

Y1 - 2019/2/10

N2 - The beam spin asymmetry of the exclusive pseudoscalar channel e→p→e′p′η was measured for the first time in the deep-inelastic regime (W>2 GeV/c2 and Q2>1 GeV2/c2) using a longitudinally polarized 5.78 GeV electron beam at Jefferson Lab with the CEBAF Large Acceptance Spectrometer. The data were accumulated in 144 four-dimensional bins of Q2, xB, −t and ϕ over a wide kinematic range, where ϕ is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the sin⁡ϕ moments is a clear indication of a substantial contribution to the polarized cross-section from transversely polarized virtual photons. In the framework of generalized parton distributions (GPDs) this contribution is expressed via longitudinal-transverse interference between chiral-even and chiral-odd GPDs. The experimental results are compared to the existing theoretical models demonstrating the sensitivity to the product of chiral-odd and chiral-even GPDs and provide new constraints to the existing GPD parameterizations.

AB - The beam spin asymmetry of the exclusive pseudoscalar channel e→p→e′p′η was measured for the first time in the deep-inelastic regime (W>2 GeV/c2 and Q2>1 GeV2/c2) using a longitudinally polarized 5.78 GeV electron beam at Jefferson Lab with the CEBAF Large Acceptance Spectrometer. The data were accumulated in 144 four-dimensional bins of Q2, xB, −t and ϕ over a wide kinematic range, where ϕ is the azimuthal angle between the lepton and hadron scattering planes, The measured azimuthal dependence with large amplitudes of the sin⁡ϕ moments is a clear indication of a substantial contribution to the polarized cross-section from transversely polarized virtual photons. In the framework of generalized parton distributions (GPDs) this contribution is expressed via longitudinal-transverse interference between chiral-even and chiral-odd GPDs. The experimental results are compared to the existing theoretical models demonstrating the sensitivity to the product of chiral-odd and chiral-even GPDs and provide new constraints to the existing GPD parameterizations.

KW - Chiral-odd generalized parton distributions

KW - CLAS collaboration

KW - Deeply Virtual Meson Production

KW - Nucleon structure

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U2 - 10.1016/j.physletb.2018.12.065

DO - 10.1016/j.physletb.2018.12.065

M3 - Article

AN - SCOPUS:85059573611

SN - 0370-2693

VL - 789

SP - 426

EP - 431

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

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

ER -