The Timing Counter of the MEG experiment: calibration and performance

الأصل · EN

The MEG detector is designed to test Lepton Flavor Violation in the μ+→ e+γ decay down to a Branching Ratio of a few 10⁻¹³. The decay topology consists in the coincident emission of a monochromatic photon in direction opposite to a monochromatic positron. A precise measurement of the relative time tₑ₊ᵧ is crucial to suppress the background. The Timing Counter (TC) is designed to precisely measure the time of arrival of the e+ and to provide information to the trigger system. It consists of two sectors up and down stream the decay target, each consisting of two layers. The outer one made of scintillating bars and the inner one of scintillating fibers. Their design criteria and performances are described.