Test beam of the calibration system for the muon $g-2$ experiment performed with a 500 MeV $e^{-}$ beam at the Beam Test Facility in Frascati.

Anastasi A., Bartolini M., Bedeschi F., Cauz D., Dabagov S., Di Sciascio G., Driutti A., Escalante O., Ferrari C., Fienberg A.T., Fioretti A., Gabbanini C., Gioiosa A., Hampai D., Hertzog D.W., Iacovacci M., Kaspar J., Lusiani A., Mastroianni S., Moricciani D., Pauletta G., Piacentino G.M., Raha N., Rossi E., Venanzoni G.
  Venerdì 30/09   15:00 - 18:00   Edificio CLA - Aula T3   I - Fisica nucleare e subnucleare
The muon anomaly $(g-2)$/2 has been measured to 0.54 parts per million by E821 experiment at Brookhaven Lab, and at present there is a 3 to 4-standard deviation difference between the SM and experimental values. A new muon $(g-2)$ experiment, E989, is being prepared at Fermilab that will improve the experimental error by a factor of four to clarify this difference. A central component to reach this fourfold improvement in accuracy is the lead fluoride calorimeter and the high-precision laser calibration system. After reviewing the requirements and the choices adopted for these systems, we will report the results of a Test Beam at performed at the Beam Test Facility (BTF) in Frascati in which a prototype of a module of the calorimeter fully equipped with electronics and the full laser calibration system will be tested with a beam of electrons of 500 MeV.