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T: Fachverband Teilchenphysik

T 28: QCD 2

T 28.4: Talk

Wednesday, March 11, 2009, 17:30–17:45, A017

Measurements of Deeply Virtual Compton Scattering from HERMES — •Weilin Yu, Avetik Airapetian, Michael Düren, Roberto Perez-Benito, and Hasko Stenzel — II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392 Gießen, Deutschland

Generalized Parton Distributions (GPDs) provide a way to access to the total angular momenta of partons and give a more complete picture of the nucleon structure than the ordinary Parton Distribution Functions (PDFs). Deeply Virtual Compton Scattering (DVCS) is the most direct exclusive process to study GPDs. Different azimuthal cross-section asymmetries of the DVCS and Bethe-Heitler (BH) interference term have been measured in the HERMES experiment.

The HERMES experiment was upgraded by installing a Recoil Detector in January 2006. Data were taken until the end of the HERA running, June 2007. Exclusive DVCS measurement can be achieved first time by detecting the recoiling proton with the Recoil Detector in the HERMES experiment.