The performance of the CMS ECAL preshower detector at LHC

CMS Collaboration

Research output: Contribution to journalConference articlepeer-review


The Preshower detector is part of the CMS endcap electromagnetic calorimeter, located in front of the lead tungstate crystals. It comprises two orthogonal planes of silicon strip sensors each preceded by a thin layer of lead. The purpose of the Preshower is to identify two closely spaced photons from π0 decays, allowing a reduction of one of the backgrounds to the two-photon decay channel of the intermediate mass Higgs boson - π0s in jets faking photons. Following a brief overview of the design of the Preshower, we present occupancy measurements and first in-situ absolute calibration.

Original languageEnglish
JournalProceedings of Science
StatePublished - 2010
Event35th International Conference of High Energy Physics, ICHEP 2010 - Paris, France
Duration: 22 Jul 201028 Jul 2010


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