Lattice QCD form factor for 
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 at zero recoil with nonperturbative current renormalization

McLean, Euan; Davies, C. T. H.; Lytle, Andrew; Koponen, Jonna

doi:10.1103/physrevd.99.114512

Cited by 51 publications

(83 citation statements)

References 96 publications

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“…For B s → D * s , we include the recent result of Ref. [51]. In addition to the lack of non-zero recoil data, no results for g and F 2 at any points are available.…”

Section: Lattice Qcd Resultsmentioning

confidence: 99%

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Precision model-independent bounds from a global analysis of b→cℓν form factors

2019

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We present a model-independent global analysis of hadronic form factors for the semileptonic decays b → c ν that exploits lattice-QCD data, dispersion relations, and heavy-quark symmetries. The analysis yields predictions for the relevant form factors, within quantifiable bounds. These form factors are used to compute the semileptonic ratios R(Hc) and various decay-product polarizations. In particular, we find R(D * s ) = 0.20(3) and R(J/ψ) = 0.25(3), predictions that can be compared to results of upcoming LHCb measurements. In developing this treatment, we obtain leading-order NRQCD results for the nonzero-recoil relations between the B + c → {J/ψ, ηc} form factors.

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“…For B s → D * s , we include the recent result of Ref. [51]. In addition to the lack of non-zero recoil data, no results for g and F 2 at any points are available.…”

Section: Lattice Qcd Resultsmentioning

confidence: 99%

“…Bs → D * s form factors: A1(q 2 max ) (blue triangle) from[51]. The colored bands are the one-standard-deviation (1σ) best-fit regions obtained from our global dispersive analysis.…”

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confidence: 99%

Precision model-independent bounds from a global analysis of b→cℓν form factors

2019

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“…ForB s → D * s the HPQCD collaboration has determined the form factor h (s) A1 at zero recoil or equivalently w = 1 [31], which is used in all fits.…”

Section: Notation and Setupmentioning

confidence: 99%

Heavy-Quark expansion for $${{\bar{B}}_s\rightarrow D^{(*)}_s}$$ form factors and unitarity bounds beyond the $${SU(3)_F}$$ limit

et al. 2020

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We carry out a comprehensive analysis of the full set ofBq → D ( * ) q form factors for spectator quarks q = u, d, s within the framework of the Heavy-Quark Expansion (HQE) to order O αs, 1/m b , 1/m 2 c . In addition to the available lattice QCD calculations we make use of two new sets of theoretical constraints: we produce for the first time numerical predictions for the full set ofBs → D ( * ) s form factors using Light-Cone Sum Rules with Bs-meson distribution amplitudes. Furthermore, we reassess the QCD three-point sum rule results for the Isgur-Wise functions entering all our form factors for both q = u, d and q = s spectator quarks. These additional constraints allow us to go beyond the commonly used assumption of SU (3)F symmetry for theBs → D ( * ) s form factors, especially in the unitarity constraints which we impose throughout our analysis. We find the coefficients of the IW functions emerging at O 1/m 2 c to be consistent with the naive O (1) expectation, indicating a good convergence of the HQE. While we do not find significant SU (3) breaking, the explicit treatment of q = s as compared to a simple symmetry assumption renders the unitarity constraints more effective. We find that the (pseudo)scalar bounds are saturated to a large degree, which affects our theory predictions. We analyze the phenomenological consequences of our improved form factors by extracting |V cb | fromB → D ( * ) ν decays and producing theoretical predictions for the lepton-flavour universality ratios R(D), R(D * ), R(Ds) and R(D * s ), as well as the τ -and D * q polarization fractions for theBq → D ( * ) q τ ν modes.

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“…A lot of experimental improvement regarding semileptonic decays is expected in the future [67][68][69]. For progress, form factor results from lattice QCD [30,[70][71][72][73][74][75][76][77][78][79][80][81][82][83][84] and also LCSRs [85][86][87][88] are very important. A lot of progress has been made in the research of the ability of new physics (NP) models, including from the beginning scalar models, to explain the data [12,17,18,36,48,50,[89][90][91].…”

Section: Jhep10(2020)163mentioning

confidence: 99%

Relations between b → cτν decay modes in scalar models

Schacht

Soni

2020

J. High Energ. Phys.

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As a consequence of the Ward identity for hadronic matrix elements, we find relations between the differential decay rates of semileptonic decay modes with the underlying quark-level transition b → cτν, which are valid in scalar models. The decay-mode dependent scalar form factor is the only necessary theoretical ingredient for the relations. Otherwise, they combine measurable decay rates as a function of the invariant mass-squared of the lepton pair q2 in such a way that a universal decay-mode independent function is found for decays to vector and pseudoscalar mesons, respectively. This can be applied to the decays $$ B\to {D}^{\ast}\tau v,{B}_s\to {D}_s^{\ast}\tau v,{B}_c\to J/\psi \tau v $$ B → D ∗ τv , B s → D s ∗ τv , B c → J / ψτv and B → Dτv, Bs → Dsτv, Bc → ηcτv, with implications for R(D(*)), $$ R\left({D}_s^{\left(\ast \right)}\right) $$ R D s ∗ , R(J/ψ), R(ηc), and ℬ(Bc → τv). The slope and curvature of the characteristic q2-dependence is proportional to scalar new physics parameters, facilitating their straight forward extraction, complementary to global fits.

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Lattice QCD form factor for Bs→Ds*lν at zero recoil with nonperturbative current renormalization

Cited by 51 publications

References 96 publications

Precision model-independent bounds from a global analysis of b→cℓν form factors

Precision model-independent bounds from a global analysis of b→cℓν form factors

Heavy-Quark expansion for $${{\bar{B}}_s\rightarrow D^{(*)}_s}$$ form factors and unitarity bounds beyond the $${SU(3)_F}$$ limit

Relations between b → cτν decay modes in scalar models

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