Energy calibration of laterally segmented electromagnetic calorimeters based on neutral pion detection

摘要

This paper describes a method for energy calibration of laterally segmented electromagnetic calorimeters based on the detection of two-photon decays of π0 mesons.The calibration procedure performs a x2 function minimization between the measured π0 energy in the calorimeter and its expected energy deduced from the π0 momentum direction.The performance of this technique is demonstrated with a Monte Carlo simulation of an experimental case where biased calibration coefficients are employed.The real calibration coefficients are restored with less than 1％ relative accuracy when a sufficient number of π0 is detected.This technique is applied to monitor daily the calibration coefficients of the calorimeter used in the Jefferson Lab Hall A DVCS experiments.