Beam Spin Asymmetries in Deeply Virtual Compton Scattering (DVCS) With CLAS at 4.8 GeV

Authors

G. Gavalian, Old Dominion University
M. J. Amaryan, Old Dominion UniversityFollow
H. Bagdasaryan, Old Dominion University
M. Bektasoglu, Old Dominion University
S. Bültmann, Old Dominion UniversityFollow
S. L. Careccia, Old Dominion University
K. V. Dharmawardane, Old Dominion University
G. E. Dodge, Old Dominion UniversityFollow
N. Guler, Old Dominion University
C. E. Hyde, Old Dominion UniversityFollow
H. G. Juengst, Old Dominion University
N. Kalantarians, Old Dominion University
A. Klein, Old Dominion UniversityFollow
S. E. Kuhn, Old Dominion UniversityFollow
J. Lachniet, Old Dominion University
M. R. Niroula, Old Dominion University
R. A. Niyazov, Old Dominion University
L. M. Qin, Old Dominion University
F. Sabatié, Old Dominion University
S. Tkachenko, Old Dominion University
L. B. Weinstein, Old Dominion UniversityFollow
J. Yun, Old Dominion University
J. Zhang, Old Dominion University
CLAS Collaboration

Document Type

Article

Publication Date

2009

DOI

10.1103/PhysRevC.80.035206

Publication Title

Physical Review C

Volume

80

Issue

3

Pages

035206 (14 pages)

Abstract

We report measurements of the beam spin asymmetry in deeply virtual Compton scattering (DVCS) at an electron beam energy of 4.8 GeV using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The DVCS beam spin asymmetry has been measured in a wide range of kinematics, 1.02<2.8 (GeV/c)², 0.12<_xB<0.48, and 0.1<−t<0.8 (GeV/c)², using the reaction →ep→e′pX. The number of H(e,e′γp) and H(e,e′π⁰p) events are separated in each (Q²,_xB,t) bin by a fit to the line shape of the H(e,e′p)X M²_x distribution. The validity of the method was studied in detail using experimental and simulated data. It was shown that with the achieved missing mass squared resolution and the available statistics, the separation of DVCS–Bethe-Heitler and π0 events can reliably be done with less than 5% uncertainty. Also, the Q² and t dependences of the sinϕ moments of the asymmetry are extracted and compared with theoretical calculations.

Comments

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©2009 The American Physical Society

Original Publication Citation

Gavalian, G., Burkert, V. D., Elouadrhiri, L., Holtrop, M., Stepanyan, S., Abrahamyan, D., . . . Collaboration, C. (2009). Beam spin asymmetries in deeply virtual compton scattering (DVCS) with CLAS at 4.8 GeV. Physical Review C, 80(3), 03520 doi:10.1103/PhysRevC.80.035206

ORCID

0000-0002-5648-0256 (Amaryan), 0000-0002-5680-1814 (Bueltmann), 0000-0003-1582-2376 (Dodge), 0000-0001-7282-8120 (Hyde), 0000-0003-2243-6836 (Kuhn), 0000-0001-5416-2900 (Weinstein)

Repository Citation

Gavalian, G.; Amaryan, M. J.; Bagdasaryan, H.; Bektasoglu, M.; Bültmann, S.; Careccia, S. L.; Dharmawardane, K. V.; Dodge, G. E.; Guler, N.; Hyde, C. E.; Juengst, H. G.; Kalantarians, N.; Klein, A.; Kuhn, S. E.; Lachniet, J.; Niroula, M. R.; Niyazov, R. A.; Qin, L. M.; Sabatié, F.; Tkachenko, S.; Weinstein, L. B.; Yun, J.; Zhang, J.; and CLAS Collaboration, "Beam Spin Asymmetries in Deeply Virtual Compton Scattering (DVCS) With CLAS at 4.8 GeV" (2009). Physics Faculty Publications. 336.
https://digitalcommons.odu.edu/physics_fac_pubs/336