18-22 February 2019
Vienna University of Technology
Europe/Vienna timezone

Belle II electromagnetic calorimeter.

19 Feb 2019, 16:30
20m
EI9 ()

EI9

Talk Calorimeters Calorimeter

Speaker

Alexander Kuzmin (Budker Institute of Nuclear Physics/Novosibirsk State University)

Description

The electromagnetic calorimeter of the Belle II detector and its
performance in the first KEKB run during 2018 are described. It is a
high-granularity homogeneous calorimeter based on 8736 CsI(Tl)
scintillating crystals. The scintillation light is detected by two PIN
photodiodes. Electronics of the calorimeter provides signal readout with
2 MHz digitization followed by wave form analysis (WFA) in FPGA resulting in
both amplitude and time reconstruction. Usage of the WFA reduces
a contribution of the pile-up noise, the time information allows to
suppress the beam background. The information from the calorimeter is used
for particle energy measurement, particle idetification as well as for the
collider luminosity measurement. The figure shows the reconstructed energy for
photons from $e^+e^-\to\gamma\gamma$. Red and blue points correspond
to data and MC, respectively.

Primary author

Alexander Kuzmin (Budker Institute of Nuclear Physics/Novosibirsk State University)

Presentation Materials