Beam spin asymmetries in deeply virtual Compton scattering (DVCS) with CLAS at 4.8 GeV
- University of New Hampshire, Durham, New Hampshire 03824-3568 (United States)
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
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, 1.0<Q{sup 2}<2.8 (GeV/c){sup 2}, 0.12<x{sub B}<0.48, and 0.1<-t<0.8 (GeV/c){sup 2}, using the reaction e-vector p{yields}e{sup '}pX. The number of H(e,e{sup '}{gamma}p) and H(e,e{sup '}{pi}{sup 0}p) events are separated in each (Q{sup 2},x{sub B},t) bin by a fit to the line shape of the H(e,e{sup '}p)X M{sub x}{sup 2} 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 {pi}{sup 0} events can reliably be done with less than 5% uncertainty. Also, the Q{sup 2} and t dependences of the sin{phi} moments of the asymmetry are extracted and compared with theoretical calculations.
- OSTI ID:
- 21293871
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 80, Issue 3; Other Information: DOI: 10.1103/PhysRevC.80.035206; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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