English

Charged Current Universality and the MSSM

High Energy Physics - Phenomenology 2013-05-30 v2

Abstract

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 VudV_{ud} from a comparison of the muon-decay Fermi constant with the vector coupling constant determined from nuclear and neutron β\beta-decay. We also revisit earlier studies of the corrections to the ratio Re/μR_{e/\mu} of pion leptonic decay rates Γ[π+e+ν(γ)]\Gamma[\pi^+ \to e^+ \nu (\gamma)] and Γ[π+μ+ν(γ)]\Gamma[\pi^+ \to \mu^+ \nu (\gamma)]. In both cases, we observe that the magnitude of the corrections can be on the order of 10310^{-3}. We show that a comparison of the first row CKM unitarity tests with measurements of Re/μR_{e/\mu} can provide unique probes of the spectrum of first generation squarks and first and second generation sleptons.

Keywords

Cite

@article{arxiv.1204.0035,
  title  = {Charged Current Universality and the MSSM},
  author = {Sky Bauman and Jens Erler and Michael Ramsey-Musolf},
  journal= {arXiv preprint arXiv:1204.0035},
  year   = {2013}
}

Comments

38 pages, 17 figures

R2 v1 2026-06-21T20:42:41.880Z