Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 39: Instrumentation and Applications V

HK 39.2: Group Report

Thursday, March 11, 2004, 14:00–14:30, C

The HERMES Recoil Detector — •Lukas Rubacek — II. Physikalisches Institut, Uni Giessen, 35392 Giessen

Generalized Parton Distributions (GPDs) are a novel theoretical approach to unde rstand the internal structure of hadrons. Experimentally, GPDs are accessible via the measurement of hard exclusive reactions. HERMES has already investigated the se reaction in e.g. Deeply Virtual Compton Scattering (DVCS) or hard exclusive electroproduction of ρ mesons. The recoil detector will significa ntly improve the current resolution of these type of measurements at HERMES. The HERMES Recoil Detector will consist of three active detector components: a silicon detector surrounding the target cell inside the beam vacuum, a scintillating fiber (SciFi) tracker and a photon detector consisting of a tungst en scintillator sandwich. The whole detector will be placed in a longitudinal magne tic field of about 1 Tesla. The individual detector components have been successfully tested at pion and proton beams. of the pr oject.