Precise Measurement of the Pi+ -> Pi0 e+ nu Branching Ratio

Details Precise Measurement of the Pi+ -> Pi0 e+ nu Branching Ratio Precise Measurement of the Pi+ -> Pi0 e+ nu Branching Ratio

2003-12-09

arxiv.org/abs/hep-ex/0312030v2

Phys.Rev.Lett.93:181803,2004

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 5 figures, 1 table, revtex4; changed content; updated analysis

Scientific paper

10.1103/PhysRevLett.93.181803

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.

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