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Report number arXiv:2409.15007 ; Nikhef 2023-022 ; CERN-TH-2024-155 ; SI-HEP-2024-20 ; P3H-24-065
Title Kolya: an open-source package for inclusive semileptonic $B$ decays
Author(s) Fael, Matteo (CERN) ; Milutin, Ilija S. (Siegen U.) ; Vos, K. Keri (Maastricht U. ; NIKHEF, Amsterdam)
Publication 2025
Imprint 2024-09-23
Number of pages 32
Note Package URL: https://gitlab.com/vcb-inclusive/kolya
In: SciPost Phys. Codeb. 55 (2025) 1
DOI 10.21468/SciPostPhysCodeb.55
Subject category Particle Physics - Lattice ; Particle Physics - Experiment ; Particle Physics - Phenomenology
Abstract 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.
Copyright/License publication: © 2025 The Author(s) (License: CC-BY-4.0)
preprint: (License: CC BY 4.0)



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 Record created 2024-09-25, last modified 2025-06-10


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