Exclusive B-meson semileptonic decays from unitarity and lattice QCD

Martinelli, G.; Naviglio, M.; Simula, S.; Vittorio, L.

doi:10.48550/arxiv.2203.16213

Cited by 2 publications

(2 citation statements)

References 21 publications

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“…Let us mention here that we are currently investigating strategies to improve the precision of the determination of |V ub | within our DM approach. Some results can be found in [22], where our improved determination of the CKM matrix element reads [18][19][20][21] specified in the insets of the panels as a function of q 2 . The theoretical DM bands of the FFs correspond to the use of the combination of the available LQCD data as inputs [14].…”

Section: The Dm Application To Semileptonic B → πℓν Decaysmentioning

confidence: 99%

Exclusive semileptonic B-meson decays using lattice QCD and unitarity

Martinelli¹,

Naviglio

Simula

et al. 2022

EPJ Web Conf.

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We present the results of the application of the Dispersion Matrix approach to exclusive semileptonic B-meson decays. This method allows to determine the hadronic form factors in a non-perturbative and completely modelindependent way. Starting from lattice results available at large values of the momentum transfer, the behaviour of the form factors in their whole kinematical range is obtained without introducing any parameterization of their momentum dependence. We will focus on the determination of the Cabibbo-Kobayashi- Maskawa matrix elements |Vcb| and |Vub| through the analysis of B(s) → D(s)(*)lv and B(s) → π(K)ℓν decays. New theoretical determinations of the Lepton Flavour Universality ratios relevant for these transitions will be also presented.

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Section: The Dm Application To Semileptonic B → πℓν Decaysmentioning

confidence: 99%

Exclusive semileptonic B-meson decays using lattice QCD and unitarity

Martinelli¹,

Naviglio

Simula

et al. 2022

EPJ Web Conf.

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“…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%

$|V_{cb}|$, 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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Exclusive B-meson semileptonic decays from unitarity and lattice QCD

Cited by 2 publications

References 21 publications

Exclusive semileptonic B-meson decays using lattice QCD and unitarity

Exclusive semileptonic B-meson 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

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