R&D for a Dedicated Fast Timing Layer in the CMS Endcap Upgrade

Abstract

The PhaseII Upgrades of CMS are being planned for the High Luminosity LHC (HL-LHC) era when the mean number of interactions per beam crossing ("in-time pileup") is expected to reach ~140-200. The potential backgrounds arising from mis-associated jets and photon showers, for example, during event reconstruction could be reduced if physics objects are tagged with an "event time". This tag is fully complementary to the "event vertex" which is already commonly used to reduce mis-reconstruction. Since the tracking vertex resolution is typically ~10^{-3} (50 micron/4.8cm) of the rms vertex distribution, whereas only ~10^{-1} (i.e. 20 vs.170 picoseconds (psec)) is demonstrated for timing, it is often assumed that only photon (i.e. EM calorimeter or shower-max) timing is of interest. We show that the optimal solution will likely be a single timing layer which measures both charged particle and photon time (a pre-shower layer).

Proceedings of the 2014 Workshop on Picosecond Photon Sensors for Physics and Medical Applications, Clermont Ferrand. 9 pages, 4 figures

References in corpus (3)

• Design of a 10 picosecond Time of Flight Detector using Avalanche Photodiodes
• Experimental Challenges of the European Strategy for Particle Physics
• Very Forward Calorimetry at the LHC - Recent results from ATLAS

Cited by in corpus (15)

• Response of microchannel plates to single particles and to electromagnetic showers
• Capacitively coupled pickup in MCP-based photodetectors using a conductive metallic anode
• Characterization of the CMS Endcap Timing Layer readout chip prototype with charge injection
• The Analog Front-end for the LGAD Based Precision Timing Application in CMS ETL
• Evolution and Recent Developments of the Gaseous Photon Detectors Technologies
• Deep Diffused Avalanche Photodiodes for Charged Particles Timing
• PICOSEC: Charged particle Timing to 24 picosecond Precision with MicroPattern Gas Detectors
• Deep Diffused APDs for Charged Particle Timing Applications: Performance after Neutron Irradiation
• Signal Processing to Reduce Dark Noise Impact in Precision Timing
• Digitized Waveform Signal Processing for Fast Timing: An Application to SiPM Timing in the Presence of Dark Count Noise
• Digitized Waveform Processing for Fast Timing
• Picosecond timing of Microwave Cherenkov Impulses from High-Energy Particle Showers Using Dielectric-loaded Waveguides
• Upgrades for the Precision Proton Spectrometer at the LHC: Precision Timing and Tracking Detectors
• High precision time measurements in future experiments
• Picosecond Timing-Planes for Future Collider Detectors