An Overview of Recent Deeply Virtual Compton Scattering Results at HERMES

Journal Article · Thu Dec 17 00:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3293946· OSTI ID:21325768

Mahon, David Francis ^[1]

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1. University of Glasgow, Glasgow, G12 8QQ, Scotland (United Kingdom)

We present recently-released HERMES Deeply Virtual Compton Scattering results of Beam-Helicity (formerly Beam-Spin, BSA) and Beam-Charge (BCA) asymmetries from unpo-larised proton, deuteron and selected heavy nuclear gas targets. A new analysis technique utilising the ability of HERA to produce a longitudinally-polarised lepton beam of both charges has been used to simultaneously extract the BSA and BCA amplitudes arising from the DVCS-squared and Interference terms of the total cross section for proton and deuteron data. Results of the Transverse Target-Spin Asymmetry (TTSA) obtained using this technique have been published for transversely-polarised proton data. These extracted asymmetries are presented, integrated over the kinematic acceptance of the HERMES experiment for this interaction, with their dependences on -t, x{sub B} and Q{sup 2} also shown. The results are compared with asymmetries from a phenomenological model of GPDs based on double distributions.

• OSTI ID: 21325768
• Journal Information: AIP Conference Proceedings, Vol. 1182, Issue 1; Conference: 10. conference on the intersections of particle and nuclear physics, San Diego, CA (United States), 26-31 May 2009; Other Information: DOI: 10.1063/1.3293946; (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

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
COMPTON EFFECT
DEUTERIUM COMPOUNDS
DEUTERONS
FOUR MOMENTUM TRANSFER
HELICITY
HERA STORAGE RING
INTERFERENCE
LEPTON BEAMS
LEPTON-NUCLEON INTERACTIONS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
POLARIZED BEAMS
PROTONS
SPIN
TOTAL CROSS SECTIONS