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

by Matteo Fael, Ilija S. Milutin, K. Keri Vos

Submission summary

Authors (as registered SciPost users):

Matteo Fael

Submission information
Preprint Link:	scipost_202410_00033v2 (pdf)
Code repository:	https://gitlab.com/vcb-inclusive/kolya
Code version:	1.0.6
Code license:	GNU General Public License v3.0
Data repository:	https://doi.org/10.5281/zenodo.10818194
Date accepted:	2025-02-25
Date submitted:	2025-02-07 10:49
Submitted by:	Fael, Matteo
Submitted to:	SciPost Physics Codebases

Ontological classification
Academic field:	Physics
Specialties:	High-Energy Physics - Experiment High-Energy Physics - Phenomenology
Approach:	Theoretical

Abstract

We introduce the code kolya, an open-source tool for phenomenological analyses of inclusive semileptonic $B\to X_c l\bar \nu_l$ 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 parameterized 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. The code is flexible and can be extended to other kinds of inclusive decays such as $B$ meson lifetimes, $B \to X_u l\bar \nu_l$ and $D$ meson decays.

Current status:

Accepted in target Journal

Editorial decision: For Journal SciPost Physics Codebases: Publish
(status: Editorial decision fixed and (if required) accepted by authors)