Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Fundamental Symmetries I

HK 11.4: Talk

Monday, February 26, 2018, 17:30–17:45, HZO 100

Normalization of stopped muons for the COMET muon to electron conversion experiment — •Andreas Jansen, Kai Zuber, and Dominik Stöckinger — TU Dresden, Institut für Kern- und Teilchenphysik, Germany

The COMET experiment at J-PARC in Japan will search for charged-lepton flavor violation by measuring the rate of neutrinoless transition of muons to electrons in the surrounding of atomic nuclei. Because this process is highly suppressed in the Standard Model it represents an excellent candidate to search for new physics and to confirm or constrain many new theories.

Negative muons will be shot at a muon stopping target where they are stopped in the coulomb field of aluminum atoms. As muons are mostly captured in excited energy levels they promptly cascade down to the 1s ground state, emitting characteristic X-rays in the process. To obtain the total number of muons stopped these X-rays are beeing measured using a high-purity germanium detector.

The key role in the following calculation plays the full energy peak efficiency of the used detector. Because of a complex structure of the muon stopping target as well as the far away position of the detector 3.5 m downstream, it is not trivial to determine this quantity. The talk will present the methods which were developed to study the efficiency and determine its value for the upcoming COMET measurements.