The Liquid Xenon calorimeter of the MEG experiment
In the Standard Model (SM) of electroweak interactions the Lepton Flavour Violating (LFV) processes are forbidden at all; however almost all SM extensions predict processes which do not conserve the lepton number. In particular the supersymmetric models predict branching ratios for LFV reactions at level of 10−(13÷16), which should be experimentally observable. The µ → e γ process is one of the golden channels for the LFV observation [1, 6]. The present limit for the branching ratio (µ → eγ)/(µ → ALL) is 1.2 × 10−11  and the aim of the MEG experiment at Paul Scherrer Institute (PSI) is to improve this limit by a factor ∼ 100. This challenging goal requires refined and innovative detection techniques in order to reach very high resolutions in the measurement of γ and e + energy, momentum and timing. One of the key elements is the Liquid Xenon (LXe) e.m. calorimeter, the main subject of this paper.
KeywordsLepton Number Beam Test Lepton Flavour Violate Paul Scherrer Institute Muon Beam
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