Cms Preshower In-Situ Absolute Calibration

Physics – Medical Physics

Scientific paper

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Scientific paper

This paper describes the in-situ absolute calibration of the Preshower detector of CMS. The Preshower is based on silicon strip sensors that will be installed in the endcaps of CMS in front of the crystal Calorimeter. Energy deposited in the lead of the Preshower is estimated by the silicon sensors, allowing a re-scaling of the energy measured by the endcap crystals. Measurement of the charge deposited in the silicon strips to a few percent accuracy is required. A precise in-situ absolute calibration of the Preshower using minimum ionizing particle signals from physics events is examined. It is shown that sufficient calibration accuracy can be obtained by using muon or pion events, and that the time required for the calibration is of the order of a few days at low luminosity.

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