The CP-conserving contribution to the transverse muon polarization in K+ -> mu+ nu gamma

Details The CP-conserving contribution to the transverse muon polarization in K+ -> mu+ nu gamma The CP-conserving contribution to the transverse muon polarization in K+ -> mu+ nu gamma

1999-03-08

arxiv.org/abs/hep-ph/9903284v1

Phys.Lett. B459 (1999) 295-300

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 3 figures

Scientific paper

10.1016/S0370-2693(99)00653-X

We present a detailed estimate of the transverse muon polarization (P_T) due to electromagnetic final-state interactions in the decay $K^+ \to \mu^+ \nu \gamma$. This CP-conserving effect represents the dominant contribution to P_T within the Standard Model. As a result of an explicit calculation, we find that the CP-conserving contribution to P_T is quite small, typically of $\cO(10^{-4})$, essentially due to the suppression factor $\alpha/4\pi^2$. This enforces the sensitivity of P_T in probing extensions of the Standard Model with new sources of time-reversal violations. A brief discussion about possible CP-violating contributions to P_T in the framework of supersymmetric models with unbroken R-parity is also presented.

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