BELLE2-NOTE-TE-2020-026 BELLE2-NOTE-PL-2021-008

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

Henrikas Svidras ; Markus Röhrken ; Simon Wehle ; Kerstin Tackmann

17 September 2021

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.

Keyword(s): photon ; efficiency ; gamma ; detection ; ecl ; calorimeter ; performance ; photons ; gammas

The record appears in these collections:
Belle II Notes (Public) > Belle II Notes : Approved plots
Belle II Notes (Internal) > Belle II Notes: Technical

 Record created 2021-08-17, last modified 2022-06-22

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