Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Fundamental Symmetries I

HK 24.2: Group Report

Tuesday, March 28, 2017, 14:30–15:00, F 073

Parity violation in the 2s-1s muonic X-ray transition — •Frederik Wauters — Johannes Gutenberg University of Mainz, Germany

Negative muons at rest get captured by nearby atoms in highly exited atomic states. These muonic atoms subsequently de-exite via radiative and Auger transitions until the muon ends up in the 1s orbital. Due to the substantial overlap between the muon wave function and the nucleus, muonic X-rays are extremely sensitive to short range interactions. For example, weak neutral currents will mix the opposite parity 2p and 2s atomic states, leading to parity violation in the 2s-1s transition. Recent anomalies in precision muon data suggest new physics which may amplify this effect. A ongoing effort at the Paul Scherrer Institute (Switzerland) aims at measuring atomic parity violating in muonic X-rays for the first time for nuclei around Z=30. As a first step, we will make use of coincidences in the muonic X-ray cascade to suppress the background for the 2s-1s transition, utilizing high granularity, large solid angle germanium detectors. Once a clear 2s-1s signal above background is achieved, our goal for 2017, a full atomic parity violation experiment can be developed.