Oct 16 – 20, 2016
Europe/Zurich timezone

Performance of MEG II Positron Timing Counter Based on Commissioning Run Result

Oct 18, 2016, 6:30 PM


Ms Miki Nishimura (The University of Tokyo)


We have developed a positron timing counter (TC) for the MEG II experiment which aims to search for μ+→e+γ decay with the world’s highest sensitivity. The TC is segmented into 512 small scintillation counters with 6 SiPMs at the both ends. Since the positron time is measured by several counters (~9 on average), an excellent timing resolution is expected. We constructed and installed a part of the final TC including calibration system with laser and performed an engineering run at piE5 beam line in PSI in 2015 winter and 2016 summer. The positron timing measurement was success and we already achieved an excellent overall resolution of 31.5 ps with 10 hits as a preliminary result. In this talk the expected final performance of TC based on the commissioning run will be discussed. Furthermore, a developed analysis algorithm, contribution of a positron tracker, and laser calibration will be presented.

Primary author

Ms Miki Nishimura (The University of Tokyo)


Antonio DE BARI (INFN Pavia) Dr Donato Nicolo (INFN Pisa) Prof. Flavio Gatti (University and INFN of Genoa) Gianluigi BOCA (INFN pavia) Dr Luca Galli (INFN Pisa) Marcello SIMONETTA (INFN Pavia) Marco FRANCESCONI (INFN Pisa) Massimo ROSSELLA (INFN Pavia) Dr Matteo De Gerone (INFN Genova) Michele Biasotti (INFN sez. Genova) Mr Mitsutaka Nakao (the Unv. of Tokyo) Dr Stefan Ritt (Paul Scherrer Institut) Wataru Ootani (Univ. of Tokyo) Yusuke Uchiyama (Paul Scherrer Institut) Dr alexander mtchedlishvili (Dr) Dr paolo walter cattaneo (INFN Pavia)

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