Constraints on the anomalous $Wtb$ couplings from $B$-physics experiments

Abstract

We analyze constraints on the anomalous $Wtb$ couplings from $B$-physics experiments, performing a correlated analysis and allowing all anomalous couplings to differ simultaneously from their Standard-Model (SM) values. The $B$-physics observables allow one to probe three linear combinations out of the four anomalous couplings, which parameterize the $Wtb$ vertex under the assumption that the SM symmetries remain the symmetries of the effective theory. The constraints in this work are obtained by taking into account the following $B$-physics observables: the ${\bar{B}}^0-B^0$ oscillations, the leptonic $B\to {\mu }^{+}{\mu }^{-}$ decays, the inclusive radiative $B\to X_s\gamma$ decays, and the differential branching fractions in the semileptonic inclusive $B\to X_s{\mu }^{+}{\mu }^{-}$ and exclusive $B\to (K,K^{\ast }){\mu }^{+}{\mu }^{-}$ decays at small $q^2$, $q$ the momentum of the ${\mu }^{+}{\mu }^{-}$ pair. We find that the SM values of the anomalous couplings belong to the 95\% CL allowed region obtained this way but lie beyond the 68\% allowed region. We also report that the distributions of the anomalous couplings obtained within our scenario differ from the results of the 1D scenario, when only one of the couplings is allowed to deviate from its SM value.

arXiv comment7 pages, extended version. The present analysis involves also exclusive B-decays resulting in more stringent constraints on the anomalous couplings

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