Exclusive semileptonic B-meson decays using lattice QCD and unitarity

Martinelli, G.; Naviglio, Manuel; Simula, Silvano; Vittorio, Ludovico

doi:10.1051/epjconf/202227000015

Cited by 8 publications

(16 citation statements)

References 19 publications

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“…An interesting question is whether the spectator-quark dependence of the hadronic FFs shown in Figs. 4 is consistent with the experimental LHCb results on the ratios of branching fractions. The latter ones do not depend on V cb and are affected by SU(3) F breaking effects within a 10% level.…”

Section: Pos(ichep2022)755supporting

confidence: 91%

“…The DM method has been adopted to compute the form factors of all semileptonic B (s) → D ( * ) (s) decays [2][3][4]. As in the B → D * case, the method allows us to extract the relevant hadronic FFs in the whole kinematic range using only LQCD results available at large values of the 4-momentum transfer without making any assumption on their momentum dependence.…”

Section: Cb | and Lfu Observables Resultsmentioning

confidence: 99%

“…Our findings are graphically collected in Fig. 2, where it is also presented the DM estimate of |V ub | [13,14]. [6], inclusive values [7,15] and UTfit indirect determinations [16,17].…”

Section: Cb | and Lfu Observables Resultsmentioning

confidence: 99%

“…At this point we want also to compare the DM bands of the hadronics FFs entering the B → D ( * ) ν , obtained in Refs. [2,3], with the ones from B s → D ( * ) s ν , obtained in [4]. The DM bands for the two sets of scalar and vector FFs of the B (s) → D (s) ν transitions are shown in Fig 3 . The LQCD results used as inputs in the DM method come from Ref.…”

Section: Su(3) F Symmetry Breaking Effectsmentioning

confidence: 98%

“…Using the DM bands of Figs. 4 we have evaluated the total decay rate modulo |V cb | 2 for each of the four decay channels. Then, adopting the PDG values for the B 0 and B s -meson lifetime, we obtain…”

Section: Pos(ichep2022)755mentioning

confidence: 99%

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$|V_{cb}|$, LFU and $SU(3)_F$ symmetry breaking in $B_{(s)} \to D_{(s)}^{(*)} \ell \nu_\ell$ decays using Lattice QCD and Unitarity

Martinelli¹,

Naviglio²,

Simula³

et al. 2022

Proceedings of 41st International Conference on High Energy Physics — PoS(ICHEP2022)

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The DM method allows a non-perturbative, model-independent determination of the momentum dependence of the semileptonic form factors to be achieved. Starting from lattice results available at large values of the 4-momentum transfer and implementing non-perturbative unitarity bounds, the behaviour of the form factors in their whole kinematical range is obtained without introducing any explicit parameterization of their momentum dependence. We consider the four exclusive semileptonic B (s) → D ( * ) (s) ν decays and extract |V cb | from the experimental data for each transition. The average over the four channels iswhich is compatible with the latest inclusive determination at 1σ level. We address also the issue of Lepton Flavour Universality by computing pure theoretical estimates of the τ/ ratios of the branching fractions for each channel, where is a light lepton. In the case of a light spectator quark we obtain R(D * ) = 0.275(8) and R(D) = 0.296(8), which are compatible with the corresponding experimental values within 1.3σ. In the case of a strange spectator quark we obtain R(D * s ) = 0.2497(60) and R(D s ) = 0.298(5). The different values for R(D * s ) and R(D * ) may reflect SU(3) F symmetry breaking effects, which seem to be present in some of the lattice form factors, especially at large values of the recoil.

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Section: Pos(ichep2022)755supporting

confidence: 91%

Section: Cb | and Lfu Observables Resultsmentioning

confidence: 99%

“…Our findings are graphically collected in Fig. 2, where it is also presented the DM estimate of |V ub | [13,14]. [6], inclusive values [7,15] and UTfit indirect determinations [16,17].…”

Section: Cb | and Lfu Observables Resultsmentioning

confidence: 99%

Section: Su(3) F Symmetry Breaking Effectsmentioning

confidence: 98%

Section: Pos(ichep2022)755mentioning

confidence: 99%

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$|V_{cb}|$, LFU and $SU(3)_F$ symmetry breaking in $B_{(s)} \to D_{(s)}^{(*)} \ell \nu_\ell$ decays using Lattice QCD and Unitarity

Martinelli¹,

Naviglio²,

Simula³

et al. 2022

Proceedings of 41st International Conference on High Energy Physics — PoS(ICHEP2022)

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QCD and Supercomputers

Martinelli

2023

Springer Proceedings in Physics

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The title of this talk should rather have been Lattice QCD and Supercomputers. I will introduce Lattice QCD as the fundamental tool to predict (postdict) the hadron spectrum and most of the matrix elements relevant for hadronic physics in the non-perturbative regime. Lattice calculations are used to study the dynamics of QCD at large temperature or chemical potential, the anomalous magnetic moment of the muon, $$g-$$ g - 2, the nucleon structure functions, the meson scattering amplitudes at low and intermediate energies and, last but not least, the weak matrix elements relevant in flavour physics and CP violation. In this presentation only some example particularly illustrative of the present sophistication and accuracy of lattice QCD calculations will be discussed in some detail.

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Anomalies in the heavy sector

Ricciardi

2022

EPJ Web Conf.

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Exclusive semileptonic B-meson decays using lattice QCD and unitarity

Cited by 8 publications

References 19 publications

$|V_{cb}|$, LFU and $SU(3)_F$ symmetry breaking in $B_{(s)} \to D_{(s)}^{(*)} \ell \nu_\ell$ decays using Lattice QCD and Unitarity

$|V_{cb}|$, LFU and $SU(3)_F$ symmetry breaking in $B_{(s)} \to D_{(s)}^{(*)} \ell \nu_\ell$ decays using Lattice QCD and Unitarity

QCD and Supercomputers

Anomalies in the heavy sector

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