DVCS with longitudinally polarized target using CLAS at 6 GeV

Journal Article · Tue Aug 04 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3215721· OSTI ID:21316985

Biselli, Angela ^[1]

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1. Fairfield University, Fairfield, CT 06824 (United States)

Deeply Virtual Compton Scattering (DVCS) is one of the simplest processes that can be described in terms of Generalized Parton Distributions (GPDs). The target single-spin asymmetry (target SSA) in the reaction ep-vector{yields}ep{gamma} is directly proportional to the imaginary part of the DVCS amplitude, and gives access to a combination of GPDs namely H-tilde, H, and E. This asymmetry will be measured in a dedicated experiment at Jefferson Lab using the CEBAF 6-GeV polarized electron beam, a polarized solid-state {sup 14}NH{sub 3} target, and the CEBAF Large Acceptance Spectrometer (CLAS) together with the Inner Calorimeter (IC). The expected asymmetry from leading-order calculations is in the range of 20% to 40%, depending on the kinematics and on the GPD model used. The DVCS amplitude will be mapped out in the Q{sup 2} region from 1 to 4 GeV{sup 2}, x{sub B} from 0.15 to 0.55 and -t from 0.1 to 2 GeV{sup 2} providing new constraints on the GPDs.

• OSTI ID: 21316985
• Journal Information: AIP Conference Proceedings, Vol. 1149, Issue 1; Conference: 18. international spin physics symposium, Charlottesville, VA (United States), 6-11 Oct 2008; Other Information: DOI: 10.1063/1.3215721; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CEBAF ACCELERATOR
COMPTON EFFECT
ELECTRON BEAMS
ELECTRON-PROTON INTERACTIONS
FOUR MOMENTUM TRANSFER
GEV RANGE
GLUONS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE KINEMATICS
PARTICLE PRODUCTION
PARTICLE STRUCTURE
PHOTONS
POLARIZATION
POLARIZED TARGETS
QUANTUM CHROMODYNAMICS
QUARKS
SPIN