First measurement of the T-violating muon polarization in the decay K^+ --> mu^+ nu gamma

Anisimovsky, V. V.; Khotjantsev, A. N.; Ivashkin, A. P.

First measurement of the T-violating muon polarization in the decay K^+ --> mu^+ nu gamma

Authors

Anisimovsky, V. V.

Khotjantsev, A. N.

Ivashkin, A. P.

Description

We present the result of the first measurement of the T-violating muon polarization P_T in the decay K^+ --> mu^+ nu gamma. This polarization is sensitive to new sources of CP-violation in the Higgs sector. Using data accumulated in the period 1996-98 we have obtained P_T = (-0.64 +- 1.85(stat) +- 0.10(syst))x10^{-2} which is consistent with no T-violation in this decay.
11 pages, 8 figures