Detailed estimates uncover small CP-conserving contributions to muon polarization in K+ decay, highlighting probing potential for new physics.
We present a detailed estimate of the transverse muon polarization (P_T) due to electromagnetic final-state interactions in the decay K^+→μ^+ υγ. 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 O(10⁻⁴), essentially due to the suppression factor α/4π^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_Tin the framework of supersymmetric models with unbroken R-parity is also presented.
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G. et al. (1999) studied this question.
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