Lattice QCD study of inclusive semileptonic decays of heavy mesons

Gambino, Paolo; Hashimoto, S.; Mächler, Sandro; Panero, Marco; Sanfilippo, Francesco; Simula, Silvano; Antonio, Smecca,; Tantalo, Nazario

doi:10.1007/jhep07(2022)083

Cited by 36 publications

(45 citation statements)

References 80 publications

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“…We presented our recent study of the inclusive semileptonic decay of the 𝐵 𝑠 meson from lattice QCD [8], which is based on the strategy proposed in ref. [10].…”

Section: Discussionmentioning

confidence: 99%

“…Lattice QCD has been extremely successful in providing precise and systematically improvable calculations for the form factors of exclusive semileptonic decays [7], while computations of inclusive quantities relied on the analytic method known as the Operator Product Expansion (OPE) [5,6]. In this contribution we present our latest work [8], regarding one of the first studies of inclusive semileptonic decays of heavy mesons using lattice QCD. This work is based on recently proposed methods [9,10] which allow for a complete first-principle computation of inclusive semileptonic decay rates starting from Euclidean correlation functions obtained from lattice simulations.…”

Section: Introductionmentioning

confidence: 99%

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Inclusive Semileptonic Decays from Lattice QCD

Gambino

Hashimoto

2020

Phys. Rev. Lett.

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We develop a method to compute the inclusive semileptonic decay rate of hadrons fully nonperturbatively using lattice QCD simulations. The sum over all possible final states is achieved by a calculation of the forward-scattering matrix elements on the lattice, and the phase-space integral is evaluated using their dependence on the time separation between two inserted currents. We perform a pilot lattice computation for theB s → X c lν decay with an unphysical bottom quark mass and compare the results with the corresponding OPE calculation. The method to treat the inclusive processes on the lattice can be applied to other processes, such as the lepton-nucleon inelastic scattering.

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“…We presented our recent study of the inclusive semileptonic decay of the 𝐵 𝑠 meson from lattice QCD [8], which is based on the strategy proposed in ref. [10].…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inclusive Semileptonic Decays from Lattice QCD

Gambino

Hashimoto

2020

Phys. Rev. Lett.

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“…The main goal of this work is to pave the way for a global fit analysis, which includes the full base of NP operators. To further constrain such global one may take advantage of lattice results for the HQE parameters, extracted from meson mass calculations at different quark mass values [58], and scattering matrix for B → X c ν [59,60]. Such results, even if preliminary, could enhance the predictive power of the HQE by better assessing the non-perturbative inputs.…”

Section: Discussionmentioning

confidence: 99%

New physics contributions to moments of inclusive $b \to c$ semileptonic decays

Fael¹,

Rahimi²,

Vos³

2022

Preprint

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Inclusive semileptonic B → X c ν decays, where = µ, e, are by now standard candles in the determination of the CKM element |V cb |. These determinations rely on the heavy-quark expansion and use moments of decay spectra to extract the nonperturbative parameters directly from data under the standard model assumption.At the same time, new physics could influence the moments of the inclusive decay. In this paper, we compute power-corrections and next-to-leading order corrections in the strong coupling constant using the full basis of dimension-six new physics operators for the inclusive B → X c ν decay. We provide predictions for lepton energy, hadronic and leptonic invariant mass moments, and perform a phenomenological study to show the possible impact of new physics. Our results could be used to perform a global fit including new physics contributions.

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“…We presented our recent study of the inclusive semileptonic decay of the B s meson from lattice QCD [8], which is based on the strategy proposed in ref. [10].…”

Section: Discussionmentioning

confidence: 99%

Inclusive semileptonic $B$-decays from lattice QCD

Antonio¹,

Gambino²,

Hirano³

et al. 2022

Proceedings of the 39th International Symposium on Lattice Field Theory — PoS(LATTICE2022)

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We present the lattice QCD calculation of inclusive semileptonic B s -meson decays. We follow a recently proposed method, which is based on the extraction of smeared spectral densities from Euclidean correlation functions and on the numerical reconstruction of the integration kernel relevant for the inclusive decay rate calculation. We compute four-point Euclidean correlation functions using JLQCD and ETM gauge ensembles with unphysically light b-quark masses, and apply two different methods for the integration kernel reconstruction. Finally, we show that the lattice results obtained in this work are in good agreement with the analytic predictions of the operator-product-expansion. This opens the path for a future full lattice QCD calculation to be used as theoretical input for the determination of the magnitude of the CKM element V cb .

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Lattice QCD study of inclusive semileptonic decays of heavy mesons

Cited by 36 publications

References 80 publications

Inclusive Semileptonic Decays from Lattice QCD

Inclusive Semileptonic Decays from Lattice QCD

New physics contributions to moments of inclusive $b \to c$ semileptonic decays

Inclusive semileptonic $B$-decays from lattice QCD

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