Speaker
Alessandra Luca
(INFN - LNF)
Description
The Mu2e experiment at FNAL aims to measure the charged-lepton flavor violating
neutrinoless conversion of of a negative muon into an electron. The conversion results in a monochromatic electron with an energy slightly below the rest mass of the muon (104.97 MeV).
The calorimeter should confirm that the candidates reconstructed by the extremely
precise tracker system are indeed conversion electrons. We therefore look for a calorimeter with a large acceptance, excellent energy resolution O(2%) and a reasonable position (time)
resolution of few mm (<1 ns). Moreover, the calorimeter should also provide a trigger for
the experiment and perform a powerful mu/e particle identification.
Finally, it should be able to keep functionality in an environment where the background delivers a dose of ~ 200 Gy/year in the hottest area. It will also need to work
immersed in 1 T axial magnetic field.
The baseline version of the Mu2e calorimeter is composed of four
homogeneous parallelepiped vanes with ~ 2000 rectangular LYSO crystals,
3x3x11 cm$^3$ dimension, each read out by two large area APDs.
photodiodes (APD's).
We show the calorimeter design, the results
obtained at 100 MeV with a small size prototype and the excellent
data-to-MC comparison for these data. We also show the simulation
of the calorimeter in mu2e and the plans for R&D and calibration.
Primary author
Alessandra Luca
(INFN - LNF)
