New Physics bounds from the combination of CKM-universality and high energy data
Abstract
Through an effective field theory approach, we analyze the new physics corrections to muon and beta decays and their effects on the extractions of V_ud and V_us. Assuming nearly flavor blind NP interactions, we find that the only quantity sensitive to NP is Delta_CKM = |V_ud|^2 + |V_us|^2 + |V_ub|^2 - 1, that receives contributions from four short distance operators. The phenomenological bound Delta_CKM = (-1 \pm 6) 10^-4 provides strong constraints on all four operators, corresponding to an effective scale Lambda > 11 TeV (90% CL). Depending on the operator, this constraint is at the same level or better than that generated by the Z pole observables.
Keywords
Cite
@article{arxiv.0910.3710,
title = {New Physics bounds from the combination of CKM-universality and high energy data},
author = {Martin Gonzalez-Alonso},
journal= {arXiv preprint arXiv:0910.3710},
year = {2010}
}
Comments
Talk given at the FLAVIAnet topical workshop 'Low energy constraints on extensions of the Standard Model' (Kazimierz, Poland), July 2009. 6 pages