Speaker
Description
The Mu2e and MEG/MEG-II projects stand in the landscape of Intensity Frontier experiments searching for Charged Lepton Flavour Violation in the muon sector.
The Mu2e experiment will search for the conversion of a negative muon into a mono-energetic electron with a 104.97 MeV energy, and aims to improve the current experimental limit by a factor $10^4$.
The calorimeter will provide particle identification, a standalone trigger, and track-seeding, while granting $\sigma_E<10$\% and $\sigma_T<500$ ps for 100 MeV electrons. It consists of two annular disks, each one containing 674 un-doped CsI crystals, readout by two large-area custom UV-extended SiPMs. The apparatus will have to sustain high particle rates (50 kHz/cm$^2$) in a $10^{-4}$ Torr vacuum, a 1T magnetic field, 100 Gy/y ionizing doses and $2\times10^{11}$ n$_{1_{MeV}}$
/cm$^2$ y.
On the other hand, the MEG-II experiment, designed to search for the $\mu+\to e\gamma$ decay, will improve by 1 order of magnitude the MEG sensitivity.
The MEG-II experiment features the same MEG liquid xenon calorimeter, improved with a highly granular readout realized with 4092 custom VUV-extended SiPMs. The calorimeter is expected to have a $\sigma_E \sim 1\%$ and a $\sigma_T \sim 50$ps for the 52.8 MeV $\gamma$-rays emitted in the decay.
