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Study of the polar cracks in the electromagnetic calorimeter the photon case, CMS Note 1997.pdf

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Study of the polar cracks in the electromagnetic calorimeter the photon case, CMS Note 1997

Available on CMS information server CMS NOTE 1997/087 The Compact Muon Solenoid Experiment Mailing address: CMS CERN, CH-1211 GENEVA 23, Switzerland CMS Note 10 November 1997 Study of the Polar Cracks in the Electromagnetic Calorimeter : the Photon Case V. Daponte, A. Givernaud, E. Locci SPP - DAPNIA, CE Saclay Abstract The study of the polar cracks in the electromagnetic calorimeter complements a former note which was devoted to the study of the azimuthal cracks. We show that the effects of cracks on the measured energy can be substancially reduced by applying a correction factor which is roughly independent of the incident energy. The physics case of a 100 GeV Higgs decaying to 2 photons is addressed. 21. Introduction The study of the polar cracks in the electromagnetic calorimeter complements the note [1] which was devoted to the study of the azimuthal cracks. This latest showed that the effects of azimuthal cracks on the measured energy could be substancially reduced by applying a correction factor which is roughly independent of the incident energy. The present note is strongly correlated to note [1]. As a conclusion and an illustration of the effect of azimuthal and polar cracks on the measurement of the photon energy, the physics case of a 100 GeV Higgs decaying to 2 photons will be addressed. 2. The ECAL geometry 2.1 Description We used the detailed ECAL simulation (3M geometry: R is about 1.44m and ?φx?η = (0.0145)2 ) described in note [2]. In θ (polar angle) and in φ (azimuth), the distance between the last crystal in a module (basket) and the module wall is 0.5 mm. The module walls are made of carbon fibres. Their thickness is 2 mm along θ, and 1mm along φ. Along φ the modules are separated by 3 mm of air, whilst this distance is only 1 mm along θ. In both coordinates, the cracks (i.e. the distance between the last crystal in one module and the first crystal in its neighbour) is then 6 mm. 2.2 Study of the shape of the polar cracks All 18 azimuthal crack