Čerenkov light contribution in lead tungstate crystals

N. Akchurin, L. Berntzon, A. Cardini, G. Ciapetti, R. Ferrari, G. Gaudio, J. Hauptman, H. Kim, F. Lacava, L. La Rotonda, M. Livan, E. Meoni, H. Paar, A. Penzo, D. Pinci, A. Policicchio, S. Popescu, G. Susinno, Y. Roh, W. VandelliR. Wigmans

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Results of detailed measurements of the Čerenkov light yield from lead tungstate (PbWO4) crystals are presented. A single crystal as well as a small homogeneous calorimeter (ECAL), consisting of 19 PbWO4 crystals, were exposed to electrons, muons and pions at the H4 beam line at CERN. It turns out that a significant fraction of the detected light is not the result of scintillation processes, but rather of the Čerenkov mechanism. This can be assessed from the analysis of both the angular dependence of the signals and their time structure. Detailed studies of the ECAL signals, corroborated by the measurements taken with the Dual-Readout calorimeter (DREAM), backing up the ECAL during beam tests, show that it is possible to estimate the independent contributions of scintillation and Čerenkov light. This information makes it possible to account for one of the dominant sources of fluctuations in hadronic showers and thus to achieve a significant improvement in hadronic calorimetry performance.

Original languageEnglish
Article number092034
JournalJournal of Physics: Conference Series
Issue number9
StatePublished - Jun 30 2008
EventEPS High Energy Particle Physics Conference, HEPP 2007 - Manchester, United Kingdom
Duration: Jul 19 2007Jul 26 2007


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