D. Kaneko

A limit for the decay from the MEG experiment

Reference EPFL-ARTICLE-173143doi:10.1016/j.nuclphysb.2010.03.030 URL: http://arxiv.org/abs/arXiv:0908.2594 Record created on 2011-12-23, modified on 2017-05-12

The MEG detector for μ+→e+γ decay search

The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 to search for the decay μ+→e+γ by using one of the most intense continuous μ+ beams in the world. This paper presents the MEG components: the positron spectrometer, including a thin target, a superconducting magnet, a set of drift chambers for measuring the muon decay vertex and the positron momentum, a timing counter for measuring the positron time, and a liquid xenon detector for measuring the photon energy, position and time. The trigger system, the read-out electronics and the data acquisition system are also presented in detail. The paper is completed with a description of the equipment and techniques developed for the calibration in time and energy and the simulation of the whole apparatus.

A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data

We report an improved measurement of the cosmic microwave background B-mode polarization power spectrum with the Polarbear experiment at 150 GHz. By adding new data collected during the second season of observations (2013–2014) to re-analyzed data from the first season (2012–2013), we have reduced twofold the band-power uncertainties. The band powers are reported over angular multipoles

Measurement of the radiative decay of polarized muons in the MEG experiment

500\leqslant {\ell }\leqslant 2100

Performance of a continuously rotating half-wave plate on the POLARBEAR telescope

, where the dominant B-mode signal is expected to be due to the gravitational lensing of E-modes. We reject the null hypothesis of no B-mode polarization at a confidence of 3.1σ including both statistical and systematic uncertainties. We test the consistency of the measured B-modes with the Λ Cold Dark Matter (ΛCDM) framework by fitting for a single lensing amplitude parameter A L relative to the Planck 2015 best-fit model prediction. We obtain

Muon polarization in the MEG experiment: Predictions and measurements

{A}_{L}={0.60}_{-0.24}^{+0.26}(\mathrm{stat}{)}_{-0.04}^{+0.00}(\mathrm{inst})

Development of PPD Sensitive to Deep UV Scintillation Photons of Liquid Xenon

± 0.14(foreground) ± 0.04(multi), where

Performance of UV-sensitive MPPC for liquid xenon detector in MEG experiment

{A}_{L}=1

Development of large area UV-sensitive MPPCs to detect scintillation light from liquid xenon

is the fiducial ΛCDM value.

Development of PPDs to detect scintillation light from liquid xenon

We studied the radiative muon decay