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Precise Measurement of the Pi+ -> Pi0 e+ nu Branching Ratio by Pocanic, D.; Frlez, E.; Baranov, V. A.; Bertl, W.; Broennimann, C.; Bychkov, M.; Crawford, J. F.; Daum, M.; Khomutov, N. V.; Korenchenko, A. S.; Korenchenko, S. M.; Kozlowski, T.; Kravchuk, N. P.; Kuchinsky, N. A.; Li, W.; Minehart, R. C.; Mzhavia, D.; Ritchie, B. G.; Ritt, S.; Rozhdestvensky, A. M.; Sidorkin, V. V.; Smith, L. C.; Supek, I.; Tsamalaidze, Z.; VanDevender, B. A.; Wang, Y.; Wirtz, H. -P.; Ziock, K. O. H. is a scholarly article available to read on EtoBox.

What is Precise Measurement of the Pi+ -> Pi0 e+ nu Branching Ratio about?

Using a large acceptance calorimeter and a stopped pion beam we have made a precise measurement of the rare Pi+ -> Pi0 e+ Nu,(pi_beta) decay branching ratio. We have evaluated the branching ratio by normalizing the number of observed pi_beta decays to the number of observed Pi+ -> e+ Nu, (pi_{e2}) decays. We find the value of Gamma(Pi+ -> Pi0 e+ Nu)/Gamma(total) = [1.036 +/- 0.004(stat.) +/- 0.004(syst.) +/- 0.003(pi_{e2})] x 10^{-8}$, where the first uncertainty is statistical, the second systematic, and the third is the pi_{e2} branching ratio uncertainty. Our result agrees well with the Standard Model prediction.

Author

Pocanic, D.; Frlez, E.; Baranov, V. A.; Bertl, W.; Broennimann, C.; Bychkov, M.; Crawford, J. F.; Daum, M.; Khomutov, N. V.; Korenchenko, A. S.; Korenchenko, S. M.; Kozlowski, T.; Kravchuk, N. P.; Kuchinsky, N. A.; Li, W.; Minehart, R. C.; Mzhavia, D.; Ritchie, B. G.; Ritt, S.; Rozhdestvensky, A. M.; Sidorkin, V. V.; Smith, L. C.; Supek, I.; Tsamalaidze, Z.; VanDevender, B. A.; Wang, Y.; Wirtz, H. -P.; Ziock, K. O. H.

Published

2003

Language

EN