The MEG Spectrometer at PSI

Abstract

The MEG experiment is designed to search the Lepton Flavor Violating process μ e+γ mori-1999,meg2007-baldini. This search requires a high intensity muon beam stopping in a thin target with the maximum rate compatible with the background from combinatorial events. The events are analyzed by a high resolution and fast liquid xenon calorimeter and by a spectrometer composed by an array of ultra-light drift chambers (DCH) for momentum measurement and a double layered timing counter (TC) for measuring the e+ time. The design parameters and performance of the spectrometer during the 2008 physics run are described.