Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 14: Poster Session: Instrumentation and Applications

HK 14.18: Poster

Tuesday, March 12, 2002, 10:30–12:45, Foyer Chemie

The HERMES Recoil Detector Project — •B. Krauss, N. Pickert, and C. Vogel — Universität Erlangen-Nürnberg

Hard exclusive reactions and especially Deeply Virtual Compton Scattering (DVCS) have become a new and important research topic at HERMES. As the existing spectrometer has been designed for inclusive and semi-inclusive physics, it was decided to improve its performance by a barrel-shaped recoil detector around the internal gas target. This detector consists of three parts: Low energy protons that are characteristic of exclusive neutral meson production or DVCS are detected by a silicon telescope being installed in the vacuum of the target chamber. Pions or protons with higher momenta will be seen by a surrounding fibre tracker. Finally an outer layer of scintillators allows detection of π⁰ decay photons. While the recoil detector alone will provide a direct measurement of the 4-momentum transfer Δ to the proton, additional cuts can be applied on the overdetermined kinematics to improve exclusivity.