Heidelberg 2007 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 510: Detektorsysteme I

T 510.5: Vortrag

Freitag, 9. März 2007, 15:00–15:15, KIP SR 3.401

A Recoil Detector to measure hard exclusive reactions at the HERMES experiment — •Roberto Perez for the HERMES collaboration — Justus-Liebig-Universit Gießen, II.Physikalisches Institut, Heinrich-Buff-Ring 16, 35392 Gießen, Germany

To study hard exclusive processes which provide access to generalised parton distributions (GPDs) and hence to the orbital angular momentum of the quarks, a new Recoil Detector surrounding the internal gas target of HERMES experiment at DESY was installed. The Recoil Detector improves the selection of exclusive events by a direct measurement of the momentum and track direction of the recoiling particle as well as by rejecting non-exclusive background. This detector is an ideal tool to combine energy and position measurements for charged particles in an intermediate momentum range 0.1 to 1.4 GeV/c. The HERMES Recoil Detector consists of three main components located inside a solenoidal magnet which provide a 1 T longitudinal magnetic field. A silicon strip detector surrounding the target cell inside the vacuum, a scintillating fiber tracker and a photon detector. Presently the Recoil Detector is fully commissioned and operating. Data taking will continue until the final HERA shutdown in July of 2007.