# Physics of fundamental Symmetries and Interactions - PSI2019

Oct 20 – 25, 2019
PSI
Europe/Zurich timezone

## Positron Reconstruction Algorithms for MEG II Pixelated Timing Counter

Oct 22, 2019, 5:15 PM
1m
WHGA/001 - Auditorium (PSI)

Poster

### Speaker

Masashi Usami (The Univ. of Tokyo, ICEPP)

### Description

The MEG II experiment is designed to achieve the world’s most sensitive $\mu^+ \rightarrow e^+\gamma$ decay search with the most intense muon beam ($7 \times 10^7 \mu^+ / s$) in Paul Scherrer Institut . This decay is prohibited in the standard model theory but predicted to occur in the many beyond standard model theories. Thus, to find this decay means to find the new physics.

To discover this undiscovered rare decay, the precise reconstruction of positron under the intense muon beam environment is necessary. We constructed the pixelated timing counter (pTC) to determine the positron crossing timing under 40 ps resolution.

We have been developed the positron reconstruction algorithms using pTC information effectively. For example, a tracking algorithm inside pTC has recently developed and this will give us even more information for the precise reconstruction. Here we will present a novel positron reconstruction algorithms to bring out the potential of pTC and achieve the best performance for the experiment.

### Primary author

Masashi Usami (The Univ. of Tokyo, ICEPP)

### Co-authors

Gianluigi Boca (INFN Pavia, The University of Pavia) paolo walter cattaneo (INFN Pavia) Matteo De Gerone (INFN Genova) Flavio Gatti (University and INFN of Genoa) Mitsutaka Nakao (The University of Tokyo) Miki Nishimura (The University of Tokyo) Wataru Ootani (Univ. of Tokyo) massimo rossella (INFN - Sezione di Pavia) Yusuke Uchiyama (The University of Tokyo) Kosuke Yanai (University of Tokyo) Fedor Ignatov (Budker Institute of Nuclear Physics)