A new limit of T-violating transverse muon polarization in the K⁺toπ⁰μ⁺ ν decay

M. Abe , M. Aliev , V. Anisimovsky , M. Aoki , Y. Asano , T. Baker , M. Blecher , P. Depommier

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M. Hasinoff K. Horie Y. Igarashi J. Imazato A.P. Ivashkin M.M. Khabibullin A.N. Khotjantsev Yu.G. Kudenko Y. Kuno K.S. Lee A. Levchenko G.Y. Lim J.A. Macdonald O.V. Mineev N. Okorokova C. Rangacharyulu S. Shimizu Y.-H. Shin Y.-M. Shin K.S. Sim N. Yershov T. Yokoi

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classification ✦ hep-ex

keywords limitdecaygivingmuonpolarizationstatsystt-violating

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A search for T-violating transverse muon polarization ($P_T$) in the $K^{+}\to \pi^{0}\mu^{+}\nu$ decay was performed using kaon decays at rest. A new improved value, $P_T= -0.0017\pm 0.0023 (stat)\pm 0.0011 (syst)$, was obtained giving an upper limit, $| P_T | < 0.0050$. The T-violation parameter was determined to be Im$\xi = -0.0053 \pm 0.0071(stat)\pm 0.0036(syst)$ giving an upper limit, $|$Im$\xi| <0.016$.

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A new limit of T-violating transverse muon polarization in the K⁺toπ⁰μ⁺ ν decay

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