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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Instrumentation V

HK 26.6: Vortrag

Mittwoch, 18. März 2026, 15:00–15:15, PHIL A 301

Construction of the crystal Zero Degree Detector for BESIII — •Frederic Stieler, Achim Denig, Peter Drexler, Werner Lauth, Max Lellmann, Jan Muskalla, Jannik Petersen, Saskia Plura, Christoph Florian Redmer, Yasemin Schelhaas, and Hang Zhou — Institute for Nuclear Physics, Johannes Gutenberg University Mainz, Germany

The crystal Zero Degree Detector (cZDD) is an addition to the BESIII experiment in China. In order to measure hadronic cross sections with the Initial State Radiation (ISR) method for a more precise calculation of the hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon, ISR photons have to be detected. Since these photons are mostly emitted at small angles in relation to the colliding particles, the cZDD will measure these photons at angles of about 1.5 mrad to 10.4 mrad, which are not covered yet by the already existing detectors at BESIII.

Following its installation at BESIII, first commissioning data have been taken. The detector is now being used to perform relative-luminosity measurements, allowing an evaluation of its performance and stability under real experimental conditions.

This contribution discusses the current status of the cZDD, covering its installation, commissioning, and the first results of the relative-luminosity measurements.

Keywords: BEPCII; BESIII; cZDD; LYSO