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A large sample of cosmic ray events collected by the CMS detector is exploited to measure the specific energy loss of muons in the lead tungstate (PbWO4) of the electromagnetic calorimeter. The measurement spans a momentum range from 5GeV/c to 1TeV/c. The results are consistent with the expectations over the entire range. The calorimeter energy scale, set with 120GeV/c electrons, is validated down...
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