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SUMMARY:The combined liquid xenon - crystal CsI calorimeter of CMD-3 detec
 tor
DTSTART;VALUE=DATE-TIME:20140228T022500Z
DTEND;VALUE=DATE-TIME:20140228T025000Z
DTSTAMP;VALUE=DATE-TIME:20261014T233501Z
UID:indico-contribution-115@indico.inp.nsk.su
DESCRIPTION:Speakers: Vasiliy Shebalin (Budker Institute of Nuclear Physic
 s)\nSince 2010 the CMD-3 detector has been collecting data at the e⁺e⁻
  collider VEPP-2000 in the Budker Institute of Nuclear Physics. CMD-3 is a
  general purpose detector designed to study e⁺e⁻ annihilation into had
 rons in the wide energy range\, E(c.m.s) = 0.3÷2 GeV. During 3 years of o
 peration detector collected integral luminosity of about 60 nb⁻¹.\nThe 
 barrel electromagnetic calorimeter of the detector consists of two subsyst
 ems: closest to the beam pipe is the Liquid Xenon calorimeter (LXe) and th
 e outer one is based on CsI scintillation crystals (CsI). LXe calorimeter 
 contains 400 liters of LXe\, covers a solid angle 0.8×4π and has a thick
 ness equals to 5.4 X₀. Finely segmented strip structure of the calorimet
 er electrodes provides the possibility to analyze energy deposition profil
 e through the shower direction\, reconstruct tracks of charged particles a
 nd measure total energy deposition.\nThe CsI calorimeter consists of 8 oct
 ants\, located around the LXe calorimeter\, and contains 1152 counters. Ea
 ch counter is based on CsI(Tl) or CsI(Na) crystal of 6×6×15 cm³ size th
 at corresponds to 8.1 X₀ in the direction transverse to the beam.\nThe t
 otal thickness of the barrel calorimeter is equal to 13.5 X₀.\nThe main 
 advantage of the combined barrel calorimeter is that the LXe calorimeter a
 llows to measure the coordinates of gamma conversion point with spatial re
 solution of about 1.5 mm\, and additional 8 X₀ of crystal CsI provides t
 he total energy resolution of combined calorimeter of about 4.5% /1GeV.\nT
 he design of the calorimeter and its current performance are presented.\nT
 he energy calibration procedures using cosmic rays for LXe and CsI and usi
 ng elastic e⁺e⁻ scattering process for the LXe calorimeter are present
 ed in this work. The accuracy of calibration constants for LXe and CsI cal
 orimeters are about 2% and 3% correspondingly. Also the gamma energy recon
 struction is described in the work and the results of π⁰ reconstruction
  giving the π⁰ width of about 8% are presented.\n\nhttps://indico.inp.n
 sk.su/event/0/contributions/115/
LOCATION:
URL:https://indico.inp.nsk.su/event/0/contributions/115/
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