Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 54: HK+T Joint Session IX: Calorimeter
HK 54.5: Talk
Thursday, March 30, 2017, 18:05–18:20, F 234
The crystal Zero Degree Detector at BESIII — Achim Denig1, Peter Drexler1, •Brice Garillon1, Leonard Koch2, Wolfgang Kühn2, Sören Lange2, Werner Lauth1, Yutie Liang2, Torben Rathmann1, and Christoph Redmer1 for the BESIII collaboration — 1Johannes Gutenberg Universität Mainz — 2Justus-Liebig-Universität Gießen
The BESIII experiment based at the BEPCII e+e− collider (Beijing, China) is investigating physics in the charm-τ region. Processes in which the particles emission peaks towards small polar angles, such as photons from initial state radiation (ISR) or scattered leptons from γ γ collisions, are detected with limited efficiency.
In order to improve their detections, we propose two small calorimeters placed at the very forward/backward angles. Each detector is composed of two arrays of 4x3 rectangular-shaped scintillating LYSO crystals, separated by a gap. The scintillation light will be collected by silicon photomultipliers (SiPMs) and the signals will be digitized using sampling Analog-to-Digital Converters (ADC).
In this contribution, we present a performance study of the detectors, based on a Geant4 simulation of BESIII, as well as the results from the tests of the LYSO crystals and the read-out electronics using radioactive sources and electron beams at the MAMI accelerator.
This work is supported by the DFG under contract No. CRC 1044.