Lattice QCD study of inclusive semileptonic decays of heavy mesons

Abstract

We present an ab initio study of inclusive semileptonic decays of heavy mesons from lattice QCD. Our approach is based on a recently proposed method, that allows one to address the study of these decays from the analysis of smeared spectral functions extracted from four-point correlators on the lattice, where the smearing is defined in terms of the phase-space integration relevant to the inclusive decays. We present results obtained from gauge-field ensembles from the JLQCD and ETM collaborations, and discuss their relation with theoretical predictions from the operator-product expansion.

arXiv comment51 pages, 27 figures and 4 tables. Clarifications added, v2 to appear in JHEP

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• 50 Years of Quantum Chromodynamics
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• New physics contributions to moments of inclusive $b\to c$ semileptonic decays
• Is right-handed current contribution to $\bar{B}\to X_{u}l\nu$ decays corrected by non-trivial vacuum in QCD?
• Anomalies in the heavy sector