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- W1997362023 abstract "We describe non-standard contributions to semileptonic processes in a model independent way in terms of an SU(2)L×U(1)Y invariant effective lagrangian at the weak scale, from which we derive the low-energy effective lagrangian governing muon and beta decays. We find that the deviation from Cabibbo universality, ΔCKM≡|Vud|2+|Vus|2+|Vub|2−1, receives contributions from four effective operators. The phenomenological bound ΔCKM=(−1±6)×10−4 provides strong constraints on all four operators, corresponding to an effective scale Λ>11 TeV (90% CL). Depending on the operator, this constraint is at the same level or better then the Z pole observables. Conversely, precision electroweak constraints alone would allow universality violations as large as ΔCKM=−0.01 (90% CL). An observed ΔCKM≠0 at this level could be explained in terms of a single four-fermion operator which is relatively poorly constrained by electroweak precision measurements." @default.
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- W1997362023 date "2010-05-01" @default.
- W1997362023 modified "2023-10-01" @default.
- W1997362023 title "Semileptonic decays of light quarks beyond the Standard Model" @default.
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- W1997362023 doi "https://doi.org/10.1016/j.nuclphysb.2009.12.020" @default.
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