Picosecond timing with CMS ECAL lead tungstate crystals.

Quaranta C.

I - Fisica nucleare e subnucleare
Aula 32C-3 - Mercoledì 19 h 09:00 - 13:00
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In the high-luminosity phase of the LHC (HL-LHC), precise time measurements with better than 30 ps resolution allow to reduce the deterioration of the reconstruction performance due to pile-up ($>$200 interactions per bunch crossing are foreseen at HL-LHC), giving the possibility to match the calorimetric energy deposits to their production vertex. A new readout electronics is being developed for the CMS ECAL, that should allow to reach the required timing performance, in particular resolution better than 30 ps should be reached for the photons from the Higgs decay. Propotypes of the new electronics have been exposed to electrons beam with energy up to 250 GeV, showing that the intrinsic ECAL resolution could reach the resolution requirements at the HL-LHC.

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