# The laser calibration system of the Muon g-2 experiment at Fermilab.

Girotti P.

Comunicazione
I - Fisica nucleare e subnucleare
Aula Palazzo dell'Emiciclo - Sala Ipogea - Giovedì 26 h 09:00 - 12:30
The muon anomaly, $a_{\mu}$, is a low-energy observable which can be both measured and computed to high precision, making it a sensitive test of the Standard Model and a probe for new physics. The previous measurement by the Brookhaven E821 experiment found a 3-standard-deviation discrepancy from the predicted value. The new Muon g-2 experiment at Fermilab aims to improve the experimental error by a factor of four in order to clarify the origin of this difference. We describe the high-precision laser calibration system used to monitor the calorimeters' response during the time muons are stored (700 $\mu$s).