Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 115: Kalorimeter (gemeinsam mit HK)

T 115.5: Vortrag

Donnerstag, 30. März 2017, 18:05–18:20, F 234

The crystal Zero Degree Detector at BESIIIAchim 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.

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