Longitudinal Target-Spin Asymmetries for Deeply Virtual Compton Scattering

CLAS Collaboration; E. Seder; A. Biselli; S. Pisano; S. Niccolai; Gary Smith; K. Joo; K. Adhikari; M. J. Amaryan; M. D. Anderson; S. Anefalos Pereira; H. Avakian; M. Battaglieri; I. Bedlinskiy; J. Bono; S. Boiarinov; P. Bosted; W. Briscoe; J. Brock; W. K. Brooks; S. Bueltmann; V. D. Burkert; D. S. Carman; C. Carlin; A. Celentano; S. Chandavar; G. Charles; L. Colaneri; P. L. Cole; M. Contalbrigo; D. Crabb; V. Crede; A. D'Angelo; N. Dashyan; R. De Vita; E. De Sanctis; A. Deur; C. Djalali; D. Doughty; R. Dupre; L. El Fassi; L. Elouadrhiri; P. Eugenio; G. Fedotov; S. Fegan; A. Filippi; J. A. Fleming; A. Fradi; D. P. Watts; Nicholas Zachariou; L. Zana

doi:10.1103/PhysRevLett.114.032001

Longitudinal Target-Spin Asymmetries for Deeply Virtual Compton Scattering

CLAS Collaboration, E. Seder, A. Biselli, S. Pisano, S. Niccolai^*, Gary Smith, K. Joo, K. Adhikari, M. J. Amaryan, M. D. Anderson, S. Anefalos Pereira, H. Avakian, M. Battaglieri, I. Bedlinskiy, J. Bono, S. Boiarinov, P. Bosted, W. Briscoe, J. Brock, W. K. BrooksS. Bueltmann, V. D. Burkert, D. S. Carman, C. Carlin, A. Celentano, S. Chandavar, G. Charles, L. Colaneri, P. L. Cole, M. Contalbrigo, D. Crabb, V. Crede, A. D'Angelo, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, C. Djalali, D. Doughty, R. Dupre, L. El Fassi, L. Elouadrhiri, P. Eugenio, G. Fedotov, S. Fegan, A. Filippi, J. A. Fleming, A. Fradi, D. P. Watts, Nicholas Zachariou, L. Zana

^*Corresponding author for this work

School of Physics and Astronomy

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

Abstract

A measurement of the electroproduction of photons off protons in the deeply inelastic regime was performed at Jefferson Lab using a nearly 6 GeV electron beam, a longitudinally polarized proton target, and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep. e'p'gamma. events, which arise from the interference of the deeply virtual Compton scattering and the Bethe-Heitler processes, were extracted over the widest kinematics in Q(2), x(B), t, and phi, for 166 four-dimensional bins. In the framework of generalized parton distributions, at leading twist the t dependence of these asymmetries provides insight into the spatial distribution of the axial charge of the proton, which appears to be concentrated in its center. These results also bring important and necessary constraints for the existing parametrizations of chiral-even generalized parton distributions.

Original language	English
Article number	032001
Number of pages	7
Journal	Physical Review Letters
Volume	114
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.114.032001
Publication status	Published - 22 Jan 2015

Keywords / Materials (for Non-textual outputs)

GENERALIZED PARTON DISTRIBUTIONS
ELECTRON-SCATTERING
FORM-FACTORS
NUCLEON
IMPACT
CLAS

Access to Document

10.1103/PhysRevLett.114.032001

Cite this

CLAS Collaboration, Seder, E., Biselli, A., Pisano, S., Niccolai, S., Smith, G., Joo, K., Adhikari, K., Amaryan, M. J., Anderson, M. D., Pereira, S. A., Avakian, H., Battaglieri, M., Bedlinskiy, I., Bono, J., Boiarinov, S., Bosted, P., Briscoe, W., Brock, J., ... Zana, L. (2015). Longitudinal Target-Spin Asymmetries for Deeply Virtual Compton Scattering. Physical Review Letters, 114(3), Article 032001. https://doi.org/10.1103/PhysRevLett.114.032001

@article{2ac89da3c5d24abbb85f8e8bf5949987,

title = "Longitudinal Target-Spin Asymmetries for Deeply Virtual Compton Scattering",

abstract = "A measurement of the electroproduction of photons off protons in the deeply inelastic regime was performed at Jefferson Lab using a nearly 6 GeV electron beam, a longitudinally polarized proton target, and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep. e'p'gamma. events, which arise from the interference of the deeply virtual Compton scattering and the Bethe-Heitler processes, were extracted over the widest kinematics in Q(2), x(B), t, and phi, for 166 four-dimensional bins. In the framework of generalized parton distributions, at leading twist the t dependence of these asymmetries provides insight into the spatial distribution of the axial charge of the proton, which appears to be concentrated in its center. These results also bring important and necessary constraints for the existing parametrizations of chiral-even generalized parton distributions.",

keywords = "GENERALIZED PARTON DISTRIBUTIONS, ELECTRON-SCATTERING, FORM-FACTORS, NUCLEON, IMPACT, CLAS",

author = "{CLAS Collaboration} and E. Seder and A. Biselli and S. Pisano and S. Niccolai and Gary Smith and K. Joo and K. Adhikari and Amaryan, {M. J.} and Anderson, {M. D.} and Pereira, {S. Anefalos} and H. Avakian and M. Battaglieri and I. Bedlinskiy and J. Bono and S. Boiarinov and P. Bosted and W. Briscoe and J. Brock and Brooks, {W. K.} and S. Bueltmann and Burkert, {V. D.} and Carman, {D. S.} and C. Carlin and A. Celentano and S. Chandavar and G. Charles and L. Colaneri and Cole, {P. L.} and M. Contalbrigo and D. Crabb and V. Crede and A. D'Angelo and N. Dashyan and {De Vita}, R. and {De Sanctis}, E. and A. Deur and C. Djalali and D. Doughty and R. Dupre and {El Fassi}, L. and L. Elouadrhiri and P. Eugenio and G. Fedotov and S. Fegan and A. Filippi and Fleming, {J. A.} and A. Fradi and Watts, {D. P.} and Nicholas Zachariou and L. Zana",

year = "2015",

month = jan,

day = "22",

doi = "10.1103/PhysRevLett.114.032001",

language = "English",

volume = "114",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "3",

}

CLAS Collaboration, Seder, E, Biselli, A, Pisano, S, Niccolai, S, Smith, G, Joo, K, Adhikari, K, Amaryan, MJ, Anderson, MD, Pereira, SA, Avakian, H, Battaglieri, M, Bedlinskiy, I, Bono, J, Boiarinov, S, Bosted, P, Briscoe, W, Brock, J, Brooks, WK, Bueltmann, S, Burkert, VD, Carman, DS, Carlin, C, Celentano, A, Chandavar, S, Charles, G, Colaneri, L, Cole, PL, Contalbrigo, M, Crabb, D, Crede, V, D'Angelo, A, Dashyan, N, De Vita, R, De Sanctis, E, Deur, A, Djalali, C, Doughty, D, Dupre, R, El Fassi, L, Elouadrhiri, L, Eugenio, P, Fedotov, G, Fegan, S, Filippi, A, Fleming, JA, Fradi, A, Watts, DP, Zachariou, N & Zana, L 2015, 'Longitudinal Target-Spin Asymmetries for Deeply Virtual Compton Scattering', Physical Review Letters, vol. 114, no. 3, 032001. https://doi.org/10.1103/PhysRevLett.114.032001

TY - JOUR

T1 - Longitudinal Target-Spin Asymmetries for Deeply Virtual Compton Scattering

AU - CLAS Collaboration

AU - Seder, E.

AU - Biselli, A.

AU - Pisano, S.

AU - Niccolai, S.

AU - Smith, Gary

AU - Joo, K.

AU - Adhikari, K.

AU - Amaryan, M. J.

AU - Anderson, M. D.

AU - Pereira, S. Anefalos

AU - Avakian, H.

AU - Battaglieri, M.

AU - Bedlinskiy, I.

AU - Bono, J.

AU - Boiarinov, S.

AU - Bosted, P.

AU - Briscoe, W.

AU - Brock, J.

AU - Brooks, W. K.

AU - Bueltmann, S.

AU - Burkert, V. D.

AU - Carman, D. S.

AU - Carlin, C.

AU - Celentano, A.

AU - Chandavar, S.

AU - Charles, G.

AU - Colaneri, L.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - Crabb, D.

AU - Crede, V.

AU - D'Angelo, A.

AU - Dashyan, N.

AU - De Vita, R.

AU - De Sanctis, E.

AU - Deur, A.

AU - Djalali, C.

AU - Doughty, D.

AU - Dupre, R.

AU - El Fassi, L.

AU - Elouadrhiri, L.

AU - Eugenio, P.

AU - Fedotov, G.

AU - Fegan, S.

AU - Filippi, A.

AU - Fleming, J. A.

AU - Fradi, A.

AU - Watts, D. P.

AU - Zachariou, Nicholas

AU - Zana, L.

PY - 2015/1/22

Y1 - 2015/1/22

N2 - A measurement of the electroproduction of photons off protons in the deeply inelastic regime was performed at Jefferson Lab using a nearly 6 GeV electron beam, a longitudinally polarized proton target, and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep. e'p'gamma. events, which arise from the interference of the deeply virtual Compton scattering and the Bethe-Heitler processes, were extracted over the widest kinematics in Q(2), x(B), t, and phi, for 166 four-dimensional bins. In the framework of generalized parton distributions, at leading twist the t dependence of these asymmetries provides insight into the spatial distribution of the axial charge of the proton, which appears to be concentrated in its center. These results also bring important and necessary constraints for the existing parametrizations of chiral-even generalized parton distributions.

AB - A measurement of the electroproduction of photons off protons in the deeply inelastic regime was performed at Jefferson Lab using a nearly 6 GeV electron beam, a longitudinally polarized proton target, and the CEBAF Large Acceptance Spectrometer. Target-spin asymmetries for ep. e'p'gamma. events, which arise from the interference of the deeply virtual Compton scattering and the Bethe-Heitler processes, were extracted over the widest kinematics in Q(2), x(B), t, and phi, for 166 four-dimensional bins. In the framework of generalized parton distributions, at leading twist the t dependence of these asymmetries provides insight into the spatial distribution of the axial charge of the proton, which appears to be concentrated in its center. These results also bring important and necessary constraints for the existing parametrizations of chiral-even generalized parton distributions.

KW - GENERALIZED PARTON DISTRIBUTIONS

KW - ELECTRON-SCATTERING

KW - FORM-FACTORS

KW - NUCLEON

KW - IMPACT

KW - CLAS

U2 - 10.1103/PhysRevLett.114.032001

DO - 10.1103/PhysRevLett.114.032001

M3 - Article

SN - 0031-9007

VL - 114

JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

M1 - 032001

ER -

Longitudinal Target-Spin Asymmetries for Deeply Virtual Compton Scattering

Abstract

Keywords / Materials (for Non-textual outputs)

Access to Document

Fingerprint

Cite this