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21.2 improved leakage for photon iso

Jean-Baptiste De Vivie De Regie requested to merge jdevivi/athena:21.2-ImprovedLeakageForPhotonIso into 21.2

An updated photon isolation leakage parameterisation has been provided. The code has been modified to be able to switch between the updated and default one. Both parameterisations come from rel20.2 studies, and the same input histograms, therefore the name of the calibration root file sill contains rel20_2 as the default one. The default is to use the previous parameterisation, but at analysis level, once the new data-driven correction will be available, the recommendation will be to use the update parameterisation

Edited by Jean-Baptiste De Vivie De Regie

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