Charged Current Universality and the MSSM

We analyze the prospective impact of supersymmetric radiative corrections on tests of charged current universality involving light quarks and leptons. Working within the R-parity conserving minimal supersymmetric Standard Model, we compute the corresponding one-loop corrections that enter the extraction of the Cabibbo-Kobayashi-Maskawa matrix element Vud from a comparison of the muon-decay Fermi constant with the vector coupling constant determined from nuclear and neutron β decay. We also revisit earlier studies of the corrections to the ratio Re/μ of pion leptonic decay rates Γ[π+→e+ν(γ)] and Γ[π+→μ+ν(γ)]. In both cases, we observe that the magnitude of the corrections can be on the order of 10-3. We show that a comparison of the first row Cabibbo-Kobayashi-Maskawa unitarity tests with measurements of Re/μ can provide unique probes of the spectrum of first generation squarks and first and second generation sleptons.

Note:

38 pages, 17 figures

14.80.Ly
minimal supersymmetric standard model: parameter space
CERN LHC Coll
oblique
muon: decay
sparticle: mass spectrum
n: decay
unitarity
supersymmetry

References(33)

Figures(48)

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