Bonn 2010 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
T: Fachverband Teilchenphysik
T 31: QCD IV
T 31.5: Talk
Thursday, March 18, 2010, 17:45–18:00, HG X
Exclusive ρ0 Production from the Recoil Detector at HERMES — •Perez-Benito Roberto Francisco, Dueren Micheal, Hayrapetyan Avetik, Stenzel Hasko, and Yu Weilin — Justus-Liebig-Universität Gießen, II. Physikalisches Institut
The HERMES experiment (HERa MEasurement of Spin) at DESY was originally designed to study the spin structure of the nucleon by inclusive and semi-inclusive deep inelastic scattering. Here, we report about hard exclusive processes that can be described in terms of Generalised Patron Distribution (GPDs). The extraction of beam-charge, beam-helicity and target-spin asymmetries from the accumulated HERMES data allows access to GPD-related information.
In January 2006 a Recoil Detector was installed that surrounded the internal gas target of the HERMES experiment. The HERMES Recoil Detector consisted of three components: a silicon strip detector inside the vacuum, a scintillating fiber tracker and the photon detector with three layers of tungsten and scintillator bars in three different orientations. All three detectors were located inside a solenoidal magnet which provides a 1T longitudinal magnetic field. The detector improves the selection of exclusive events by a direct measurement of the recoiling target nucleon in an intermediate momentum range of 0.1 to 1.4 GeV/c as well as by rejecting non-exclusive background.
The ratio of the cross-sections of ρ0 meson production between hydrogen and deuterium will provide an insight into the relative contribution to the nucleon cross-section from quarks and gluons.