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SUMMARY:Development of a novel high granularity crystal electromagnetic ca
 lorimeter
DTSTART;VALUE=DATE-TIME:20230907T152000Z
DTEND;VALUE=DATE-TIME:20230907T154000Z
DTSTAMP;VALUE=DATE-TIME:20260906T150905Z
UID:indico-contribution-2983@indico.tlabs.ac.za
DESCRIPTION:Speakers: Baohua Qi (Institute of High Energy Physics\, Chines
 e Academy of Sciences)\nMotivated by the physics programs that aim at prec
 ision measurements of the Higgs\, W and Z bosons\, as well as the top quar
 k\, future lepton colliders (e.g. the Circular Electron Positron Collider\
 , or CEPC) require an excellent calorimetry system to achieve the unpreced
 ented jet energy resolution. The CEPC team has proposed a new detector con
 cept named “the 4th detector concept”. A major motivation is to signif
 icantly improve the Boson Mass Resolution (BMR) of better than 3% compared
  to 4%\, which corresponds to the performance of the baseline detector pro
 posed in the CEPC Conceptual Design Report (CEPC CDR). As a key sub-detect
 or of “the CEPC 4th detector concept”\, the novel high granularity cry
 stal electromagnetic calorimeter (ECAL) is designed to achieve an excellen
 t jet reconstruction and an optimal EM energy resolution of $2-3~\\%/\\sqr
 t{E(GeV)}$ with the homogeneous structure and excellent three-dimensional 
 spatial and temporal resolutions.\n\nExtensive R&D efforts have been carri
 ed out to assess the potential and requirements of the crystal ECAL with d
 edicated Geant4 full simulation\, ranging from the ECAL detector units to 
 the full sub-detector system. Hardware activities\, which focus on charact
 erizing crystals and silicon photomultipliers (SiPMs)\, have been conducte
 d to provide solid inputs for simulation validation. The physics performan
 ce evaluation studies are ongoing with particle-flow algorithm “Arbor”
 \, which is being optimized for the crystal ECAL as well as the general 
 “4th detector concept”. Meanwhile\, small-scale crystal modules are cu
 rrently under development for beam tests to evaluate the performance of el
 ectromagnetic showers and to address critical issues at the system-level.\
 n\nThis contribution will introduce the crystal ECAL design and optimizati
 ons\, the latest progress on the performance evaluation\, crystal-SiPM mea
 surements and simulation validation. Preliminary beamtest results could al
 so be expected.\n\nhttps://indico.tlabs.ac.za/event/112/contributions/2983
 /
LOCATION: Meeting Room 2.41 - 2.43
URL:https://indico.tlabs.ac.za/event/112/contributions/2983/
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