Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 31: Instrumentation and Applications IV

HK 31.5: Vortrag

Mittwoch, 10. März 2004, 15:15–15:30, C

Proton Pion identification with a scintillating fiber detector — • Wolfgang Sommer, Michael Düren, Matthias Hartig, Matthias Hoek, Tibor Keri, Shaojun Lu, Lukas Rubacek, Björn Seitz, and Hasko Stenzel — II. Physikalisches Institut, JLU-Giessen, 35392 Giessen

The Hermes Recoil Project aims at measuring recoil protons produced in DVCS and Bethe-Heitler processes with transverse momenta between 0.1 GeV/c to 1.4 GeV/c. One part of the detector, the scintillating fiber detector was designed to track and identify protons between 0.3 GeV/c and 0.8 GeV/c. The dominant source of background for protons originating from DVCS are pions resulting predominantly from Δ-decays. Scintillating fiber detectors, which are well known as tracking devices, are used in our detector to separate protons and pions in the specified momentum range. This is achieved by measuring the deposited energy and comparing it to the calculated response for protons and pions. The applied method is a modification of the Log-Likelihood method used in the current Hermes experiment. The separation of protons and pions was tested during an experiment at GSI Darmstadt using a mixed proton/pion beam.