Abstract
The upgrade of the Compact Muon Solenoid (CMS) crystal electromagnetic calorimeter (ECAL), which will operate at the High Luminosity Large Hadron Collider (HL-LHC), will achieve a timing resolution of around 30 ps for high energy photons and electrons. In this talk we will discuss the benefits of precision timing for the ECAL event reconstruction at HL-LHC. Simulation studies on the timing properties of PbWO crystals, as well as the impact of the photosensors and the readout electronics on the timing performance, will be presented. Test beam studies on the timing performance of PbWO4 crystals with various photosensors and readout electronics will be shown.
Highlights
The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid Experiment (CMS) [1] is currently operating at the Large Hadron Collider (LHC) [2] with proton-proton collisions at 13 TeV center-of-mass energy and at a bunch spacing of 25 ns, at an instantaneous luminosity in the range of up to 1.7×1034 cm−2s−1
The upgrade of the Compact Muon Solenoid (CMS) crystal electromagnetic calorimeter (ECAL), which will operate at the High Luminosity Large Hadron Collider (HL-LHC), will achieve a timing resolution of around 30 ps for high energy photons and electrons
In this talk we will discuss the benefits of precision timing for the ECAL event reconstruction at HL-LHC
Summary
The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid Experiment (CMS) [1] is currently operating at the Large Hadron Collider (LHC) [2] with proton-proton collisions at 13 TeV center-of-mass energy and at a bunch spacing of 25 ns, at an instantaneous luminosity in the range of up to 1.7×1034 cm−2s−1. The higher instantaneous luminosity will result in around 200 concurrent interactions per LHC bunch crossing, termed pileup, spread over a luminous region of a few centimetres along the beam axis, and of about few 100 ps in time. This will present significant challenges to the reconstruction algorithms currently in use in CMS. Pileup mitigation can be substantially improved by means of precision time-tagging of calorimeter clusters. This is achieved by associating them to primary vertices via 4D triangulation [5]. Assuming 20 ps timing resolution, the 4D triangulation vertexing allows the effective pileup to be reduced to the current Run II levels, restoring the vertex reconstruction efficiency
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