1. Performance test of a lead-glass counter for the J-PARC E36 experiment.
- Author
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Miyazaki, Y., Shimizu, S., Bianchin, S., Djalali, C., Gill, D., Jiang, J., Hasinoff, M., Horie, K., Igarashi, Y., Imazato, J., Ivashkin, A., Kohl, M., Narikawa, R., Pywell, R., Strauch, S., Tabata, M., Toyoda, A., Yamazaki, H., and Yoshioka, T.
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CRYSTAL glass , *PHYSICS experiments , *LEPTONS (Nuclear physics) , *CHERENKOV counters , *MOMENTUM (Mechanics) , *POLYETHYLENE - Abstract
The J-PARC E36 experiment will search for a violation of lepton universality by a precise measurement of the ratio of the kaon decay widths R K = Γ ( K + → e + ν ) / Γ ( K + → μ + ν ) . Charged particles will be identified by the combination of three independent systems: a lead-glass Cherenkov counter, an aerogel Cherenkov counter, and a time-of-flight measurement. The performance of the lead-glass Cherenkov counter was investigated with e + , μ + , and π + beams in the relevant momentum region from the K + decays. By using a polyethylene degrader to slow down the beam momentum in front of the lead-glass block, we succeeded in reducing the muon mis-identification probability down to 5% while maintaining a high e + detection efficiency of 98%. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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