The supersymmetric prediction for the muon transverse polarization in the $K^+ \leftarrow π^0 μ^+ ν_μ$ decay

Details The supersymmetric prediction for the muon transverse polarization in the $K^+ \leftarrow π^0 μ^+ ν_μ$ decay The supersymmetric prediction for the muon transverse polarization in the $K^+ \leftarrow π^0 μ^+ ν_μ$ decay

1996-11-05

arxiv.org/abs/hep-ph/9611237v1

Phys.Rev. D55 (1997) 5334-5340

Physics

High Energy Physics

High Energy Physics - Phenomenology

latex, 18 pages, 1 latex figure

Scientific paper

10.1103/PhysRevD.55.5334

The muon transverse polarization in the $K^+ \leftarrow \pi^0 \mu^+ \nu_\mu$ decay will be measured at the $10^{-4}$ level in forthcoming experiments. We compare the phenomenological perspectives with the theoretical predictions in supersymmetric extensions of the standard model. In the minimal extension, CP-violating phases lead to a non-zero transverse polarization, that however is too small to account for a positive experimental signal. The problems that one encounters when departing from minimal assumptions are discussed. An observable effect is possible if the hypothesis of R-parity conservation is relaxed, but only at the price of assuming a very special pattern for the R-parity breaking couplings.

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