Soffi, L. (2014) Use of ECAL time in physics analysis at CMS. Il nuovo cimento C, 37 (1). pp. 175-178. ISSN 1826-9885
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Abstract
The CMS ECAL is a high-resolution electromagnetic calorimeter made of PbWO4 crystals, which relies upon precision calibration in order to achieve and maintain its design performance. The fast decay time of scintillation light from the PbWO4 crystals, the electronic pulse shaping and the sampling rate allows for an excellent time resolution to be obtained with ECAL. For particles with an energy above 10 GeV the time of arrival can be measured with a resolution better than 1 ns. Good time resolution may provide discrimination between photons and jets by exploiting differences between the time profile measured in adjacent ECAL crystals. Constraints on the position of the primary vertex may also be obtained by exploiting the time measurement of two high momentum photons. The precise time measurement makes it possible to identify particles predicted by different theories beyond the Standard Model, for example long-lived neutralinos decaying into photons.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Experimental tests ; Neutralinos and charginos |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 08 May 2020 15:07 |
| Last Modified: | 08 May 2020 15:07 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/18490 |
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