New Physics bounds from the combination of CKM-universality and high energy data

Details New Physics bounds from the combination of CKM-universality and high energy data New Physics bounds from the combination of CKM-universality and high energy data

2009-10-19

arxiv.org/abs/0910.3710v1

Acta Phys.Polon.Supp.3:159-164,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the FLAVIAnet topical workshop 'Low energy constraints on extensions of the Standard Model' (Kazimierz, Poland),

Scientific paper

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.

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