Feb 11 – 15, 2013
Vienna University of Technology
Europe/Vienna timezone

The CMS electromagnetic calorimeter: performance and role in the discovery of the Higgs boson

Feb 14, 2013, 9:25 AM
Vienna University of Technology

Vienna University of Technology

Gußhausstraße 25-29, 1040 Wien (Vienna), Austria


Julie Malcles (CEA - Centre d'Etudes de Saclay (FR))


The signature of the two-photon decay of a low-mass Higgs boson is a narrow resonance, smeared by the photon energy resolution, over a large continuum background. The excellent energy resolution and photon identification capabilities of the CMS electromagnetic calorimeter (ECAL) at the LHC enhance the experimental sensitivity to this decay mode. The ECAL is a hermetic, fine grained and homogeneous calorimeter containing 75848 lead-tungstate (PbWO4) crystals, located inside the CMS superconducting solenoidal magnet. The scintillation light is detected by avalanche photodiodes (APDs) in the barrel section and by vacuum phototriodes (VPTs) in the two endcap sections. A silicon/lead pre-shower detector is installed in front of the endcaps. The ECAL performance is presented in detail and its role in the hunt for the Higgs boson, through the two-photon decay mode, is discussed.
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Primary author

Julie Malcles (CEA - Centre d'Etudes de Saclay (FR))

Presentation materials