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Inclusive semileptonic decays from lattice QCD: analysis of systematic effects

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arxiv 2504.03358 v1 pith:EK2W4WQ4 submitted 2025-04-04 hep-lat hep-ph

Inclusive semileptonic decays from lattice QCD: analysis of systematic effects

classification hep-lat hep-ph
keywords effectslatticesystematiccontroldecaysfinalfinite-volumeinclusive
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Lattice QCD calculations of inclusive semileptonic decay rates involve new types of systematic effects, such as truncation errors in the estimation of energy integrals, or finite-volume effects for multi-body final states. We investigate them for the lattice data of $D_s \to X_s \ell\nu$ decays, obtained using M\"obius domain-wall fermions. Separating the ground-state and excited-state contributions results in better control over these systematic effects. With the Chebyshev polynomial approximation, the truncation error is under control, while the finite-volume effects are estimated using a model to describe two-body final states.

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