New Physics bounds from CKM-unitarity

Details New Physics bounds from CKM-unitarity New Physics bounds from CKM-unitarity

2011-01-24

arxiv.org/abs/1101.4679v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

To appear in the proceedings of the 45th Rencontres de Moriond: Electroweak Interactions and Unified Theories, La Thuile, Aost

Scientific paper

Using an effective field theory approach, we study the new physics (NP) 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 CKM-unitarity test is the only way to expose NP. The four short-distance operators that can generate a deviation are strongly constrained by the phenomenological bound |Vud|^2 + |Vus|^2 + |Vub|^2 - 1 = (-0.0001 \pm 0.0006), corresponding to an effective scale > 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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