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• W3208590982 abstract "With updated experimental data and improved theoretical calculations, several significant deviations are being observed between the Standard Model predictions and the experimental measurements of the branching ratios of $bar{B}_{(s)}^0to D_{(s)}^{(*)+} L^-$ decays, where $L$ is a light meson from the set ${pi,rho,K^{(ast)}}$. Especially for the two channels $bar{B}^0to D^{+}K^-$ and $bar{B}_{s}^0to D_{s}^{+}pi^-$, both of which are free of the weak annihilation contribution, the deviations observed can even reach 4-5$sigma$. Here we exploit possible new-physics effects in these class-I non-leptonic $B$-meson decays within the framework of QCD factorization. Firstly, we perform a model-independent analysis of the effects from twenty linearly independent four-quark operators that can contribute, either directly or through operator mixing, to the quark-level $bto cbar{u} d(s)$ transitions. It is found that, under the combined constraints from the current experimental data, the deviations observed could be well explained at the $1sigma$ level by the new-physics four-quark operators with $gamma^{mu}(1-gamma_5)otimesgamma_{mu} (1-gamma_5)$ structure, and also at the $2sigma$ level by the operators with $(1+gamma_5)otimes(1-gamma_5)$ and $(1+gamma_5)otimes(1+gamma_5)$ structures. However, the new-physics four-quark operators with other Dirac structures fail to provide a consistent interpretation, even at the $2sigma$ level. Then, as two specific examples of model-dependent considerations, we discuss the case where the new-physics four-quark operators are generated by either a colorless charged gauge boson or a colorless charged scalar, with their masses fixed both at the $1$~TeV. Constraints on the effective coefficients describing the couplings of these mediators to the relevant quarks are obtained by fitting to the current experimental data." @default.
• W3208590982 created "2021-11-08" @default.
• W3208590982 creator A5019106676 @default.
• W3208590982 creator A5062586569 @default.
• W3208590982 creator A5073725040 @default.
• W3208590982 creator A5078785146 @default.
• W3208590982 date "2021-10-28" @default.
• W3208590982 modified "2023-10-15" @default.
• W3208590982 title "Probing new physics in class-I B-meson decays into heavy-light final states" @default.
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• W3208590982 doi "https://doi.org/10.1007/jhep10(2021)235" @default.
• W3208590982 hasPublicationYear "2021" @default.
• W3208590982 type Work @default.
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