Measurement of the data to MC ratio of photon reconstruction efficiency of the Belle II calorimeter using radiative muon pair events

Sumitted to PubDB: 2022-06-22

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Authors	Markus Röhrken, Henrikas Svidras, Kerstin Tackmann, Simon Wehle
Date	Sept. 17, 2021
Belle II Number	BELLE2-NOTE-PL-2021-008
Abstract	This note presents photon detection efficiency data-to-simulation ratio distributions in the barrel region of the electromagnetic calorimeter of the Belle II detector at the SuperKEKB asymmetric energy electron-positron collider. They are computed using 71.2 fb−1 of experimental data collected by the Belle II detector and the official Belle II Monte Carlo simulation. An initial-state high energy photon from e+e− → μ+μ−(γISR) is searched by predicting its momentum from missing momentum of the dimuon system. The data-to-simulation ratios of the detection efficiency are presented as functions of missing momentum and its angular directions.