München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 67: Detektorsysteme 3

T 67.1: Group Report

Friday, March 13, 2009, 14:00–14:20, A016

New Results from the HERMES Recoil Detector — •Andreas Mussgiller — DESY, 22603 Hamburg, Germany

Hard exclusive processes provide access to generalized parton distributions (GPDs), which extend our description of the nucleon structure beyond the standard parton distributions. The Deeply Virtual Compton Scattering (DVCS) process provides the theoretically cleanest access to the GPDs. For the final two years of data taking, a Recoil Detector had been installed at the HERMES experiment at HERA with the purpose of improving the ability to measure hard-exclusive processes. In addition the Recoil Detector allows to measure the individual background contributions which can be used to refine previously published results on DVCS. The Recoil Detector consisted of three sub-detectors inside a 1 T solenoidal magnetic field. A silicon detector operated inside the HERA vacuum, a scintillating fiber tracker, and a photon detector. The progress of the ongoing data analysis will be presented.