|
FIZIKA B 20 (2011) 1, 75-92
 
NEW RESULTS ON THE μ+ → e+ γ DECAY FROM THE MEG EXPERIMENT
A. PAPA, on behalf of the MEG collaboration
Paul Scherrer Institut, Villigen, Switzerland
Received 4 January 2011; Accepted 9 November 2011
Online 10 January 2012
The aim of the MEG experiment is to measure the branching ratio
of the rare muon decay BR = (μ+ → e
+ γ)/(μ+ →
e+νe
νμ)
at a sensitivity of ≈ 10−13. To reach this goal, the
experiment must use the most intense continuous muon beam available
( ≈ 108 μ/s) and obtain the highest energy, time and
space resolutions, today reachable. MEG started to collect data at
the end of 2008. During 2009 a large part of the data taking time
was devoted to calibration measurements and detector performance
optimizations; a new physics data sample was collected at the end
of this year in 1.5 months of acquisition time. A description of
the main features of each subdetector and of the measured
resolutions are given and the results of the search for
μ+ → e+ γ decay based on the 2009 data sample are
presented.
PACS numbers: 13.35.Bv, 11.30.Hv, 11.30.Qc, 14.60.Fg
UDC 539.126.3
Keywords: lepton flavour violation, MEG experiment, μ+ → e+ γ
|
