Precision calculations of Bd,s → π, K decay form factors in soft-collinear effective theory
نویسندگان
چکیده
We improve QCD calculations of the $B_{d, s} \to \pi, K$ form factors at large hadronic recoil by implementing next-to-leading-logarithmic resummation for obtained leading-power light-cone sum rules in soft-collinear effective theory (SCET) framework. Additionally, we endeavour to investigate a variety subleading-power contributions these heavy-to-light ${\cal O}(\alpha_s^0)$, including higher-order terms heavy-quark expansion hard-collinear quark propagator, evaluating desired matrix element next-to-leading-order term ${\rm SCET_{I}}$ representation weak transition current, taking into account off-light-cone two-body elements as well three-particle higher-twist corrections from subleading bottom-meson distribution amplitudes, and computing twist-five twist-six four-body effects with aid factorization approximation. Having our disposal SCET exclusive $B$-meson decay factors, further explore detail numerical implications newly computed employing three-parameter model both leading-twist amplitudes. Taking advantage customary Bourrely-Caprini-Lellouch parametrization semileptonic then determine correlated results interesting series coefficients, carrying out simultaneous fit achieved rule predictions available lattice results.
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2023
ISSN: ['1127-2236', '1126-6708', '1029-8479']
DOI: https://doi.org/10.1007/jhep03(2023)140