Charged Current Universality and the MSSM
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 from a comparison of the muon-decay Fermi constant with the vector coupling constant determined from nuclear and neutron -decay. We also revisit earlier studies of the corrections to the ratio of pion leptonic decay rates and . In both cases, we observe that the magnitude of the corrections can be on the order of . We show that a comparison of the first row CKM unitarity tests with measurements of can provide unique probes of the spectrum of first generation squarks and first and second generation sleptons.
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