Deeply Virtual Compton Scattering Beam-Spin Asymmetries

Journal Article · Thu Jan 24 00:00:00 EST 2008

OSTI ID:922528

Girod, F X; Niyazov, R A

The beam spin asymmetries in the hard exclusive electroproduction of photons on the proton (ep -> epg) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the Bethe-Heitler process and of deeply virtual Compton scattering. Over the whole kinematic range (x_B from 0.11 to 0.58, Q^2 from 1 to 4.8 GeV^2, -t from 0.09 to 1.8 GeV^2), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A = a*sin(phi)/[1+c*cos(phi)]. This extensive set of data can thus be used to constrain significantly the generalized parton distributions of the nucleon in the valence quark sector.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 922528
• Report Number(s): JLAB-PHY-07-767; DOE/OR/23177-0294; arXiv:0711.4805; TRN: US0801149
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
COMPTON EFFECT
ELECTROPRODUCTION
NUCLEONS
PHOTONS
PROTONS
QUARKS
SPIN
VALENCE