CERN Accelerating science

CMS Note
Report number	CMS-CR-2010-123
Title	Measurement of the muon stopping power in lead tungstate with the Electromagnetic Calorimeter in CMS
Author(s)	Benaglia, Andrea Davide (Milan Bicocca U. ; INFN, Milan Bicocca)
Publication	2010
Collaboration	CMS Collaboration
Imprint	25 Jul 2010
Number of pages	7
Presented at	14th International Conference On Calorimetry In High Energy Physics, Beijing, China, 10 - 14 May 2010
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Keywords	ECAL
Abstract	A large sample of cosmic ray events collected by the CMS detector has been exploited to measure the muon stopping power in the lead tungstate (PbWO$_4$) of the electromagnetic calorimeter. The events were recorded in October-November 2008, during commissioning runs of the CMS detector with the solenoid at the nominal field strength of 3.8 T. The measurement spans a momentum range from 5 to 1000 GeV/c. The results are consistent with the expectations over the entire range. A comparison of collision losses with radiative losses allowed for a first experimental determination of muon critical energy in lead tungstate, measured to be $160^{+5}_{-6}\,({\rm stat.}) \pm8\,({\rm syst.})$ GeV, in agreement with expectations.
Copyright/License	Preprint: (License: CC-BY-4.0)