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

Abstract

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.

10 pages, 3 figures

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Cited by in corpus (6)

• Beta Decays and Non-Standard Interactions in the LHC Era
• T-odd correlation in the $K_{l3\gamma }$-decay
• Radiative neutron beta-decay in effective field theory
• Muon transverse polarization in the $K_{l2\gamma }$ decay in SM
• Tests of the Standard Model Using Muon Polarization Asymmetries in Kaon Decays
• A Possibility to Measure CP-Violating Effects in the Decay K --> mu nu gamma