24-28 February 2020
Budker Institute of Nuclear Physics
Asia/Novosibirsk timezone

Performance of the Belle II Electromagnetic Calorimeter in First Data

26 Feb 2020, 14:50
Contributed Oral Calorimetry Calorimetry


Savino Longo (DESY)


The Belle II experiment at the SuperKEKB electron-positron collider in Tsukuba, Japan began physics data taking in 2019 and will search for new physics in the flavour sector of the Standard Model as well as for dark sectors. The Belle II electromagnetic calorimeter plays a central role in photon, neutral pion and neutral hadron reconstruction, in addition to enabling advanced triggering techniques to give Belle II improved sensitivities to unique signatures of potential new physics. The calorimeter is constructed from 8736 CsI(Tl) scintillator crystals which have been equipt with new waveform sampling electronics to maintain high performance while operating in the intense beam background environment produced by SuperKEKB. This talk will present measurements of the photon and neutral pion reconstruction performance during the first physics data-taking runs of Belle II in addition to results of the first application of CsI(Tl) pulse shape discrimination at a B-Factory experiment. Through the application of pulse shape discrimination, it will be demonstrated that improvements are achieved in challenging and important areas of particle identification such as neutral hadron vs. photon identification and low momentum charged particle identification.

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