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Kolya: an open-source package for inclusive semileptonic B decays

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arxiv 2409.15007 v1 pith:Q3SU4FBM submitted 2024-09-23 hep-ph hep-exhep-lat

Kolya: an open-source package for inclusive semileptonic B decays

classification hep-ph hep-exhep-lat
keywords librarycorrectionsdecaysevaluationinclusivekolyaopen-sourcequark
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We introduce the code kolya, an open-source tool for phenomenological analyses of inclusive semileptonic $B$ meson decays. It contains a library to compute predictions for the total rate and various kinematic moments within the framework of the heavy quark expansion, utilizing the so-called kinetic scheme. The library currently includes power corrections up to $1/m_b^5$. All available QCD perturbative corrections are implemented via interpolation grids for fast numerical evaluation. We also include effects from new physics parameterised as Wilson coefficients of dimension-six operators in the weak effective theory below the electroweak scale. The library is interfaced to CRunDec for easy evaluation of the quark masses and strong coupling constant at different renormalization scales. The library is developed in Python and does not require compilation. It can be used in an interactive Jupyter notebook session.

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  1. $\bar B\to D^{(*)}\ell\bar \nu$ Branching Ratios and Evidence for Isospin Breaking in $\Upsilon(4S)$ Decays

    hep-ph 2026-04 unverdicted novelty 5.0

    A combined fit to B to D(*) l nu data yields R^{±0}=1.062(19) as evidence for isospin violation in Υ(4S) decays and branching fractions up to 1.6σ larger than prior averages, addressing inconsistencies in V_cb extractions.