Speaker
Description
The crystal Zero Degree Detector (cZDD) is a proposed upgrade to the BESIII experiment in China. In order to measure hadronic cross sections using the Initial State Radiation (ISR) method for a more precise determination of the hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon, ISR photons must be detected. Since these photons are predominantly emitted at small angles with respect to the colliding beams, the cZDD will detect them in an angular range from approximately 1.5 mrad to 10.4 mrad, which is not covered
by the existing detectors at BESIII. In addition, the cZDD will replace the beam luminosity monitors currently in operation.
The design of the first cZDD prototype, the results of its beam test at the
Mainz Microtron (MAMI), and initial studies of its performance as a beam monitor for BESIII are presented at the 14th Beam Telescopes and Test Beams Workshop in Mainz.