B
                            
                                s
                             → Kℓν
                            
                                ℓ
                             and B
                            (s) → π(K)ℓ
                            +
                            ℓ
                            − decays at large recoil and CKM matrix elements

Khodjamirian, Alexander; Rusov, Aleksey V.

doi:10.1007/jhep08(2017)112

Cited by 74 publications

(46 citation statements)

References 42 publications

(75 reference statements)

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“…This value agrees well with the lattice determinations in [73][74][75]. The form factor can be determined via LCSR [76] or extrapolated from lattice simulations [77,78]. Both approaches JHEP03(2020)122…”

Section: Rare Decays From Bsm Operatorssupporting

confidence: 79%

Charming new B-physics

Jäger

Kirk

Lenz

et al. 2020

J. High Energ. Phys.

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We give a comprehensive account of the flavour physics of Beyond-Standard-Model (BSM) effects in b → ccs transitions, considering the full set of 20 four-quark operators. We discuss the leading-order structure of their RG mixing with each other as well as the QCD-penguin, dipole, and FCNC semileptonic operators they necessarily mix with, providing compact expressions. We also provide the first complete results for BSM effects in the lifetime observables ∆Γ s and τ (B s )/τ (B d ), as well as for the semileptonic CP-asymmetry a s sl . From a global analysis, we obtain stringent constraints on 16 of the 20 BSM operators, including the 10 operators Q c 1...10 involving a right-handed strange quark. Focussing on CP-conserving new physics, the constraints correspond to NP scales of order 10 TeV in most cases, always dominated by exclusive and/or radiative B-decays via RGE mixing. For the remaining four operators, including the two Standard-Model (SM) ones, larger effects are experimentally allowed, as previously noted in [1]. We extend that paper's scope to the CP-violating case, paying attention to the impact on the decay rate and time-dependent CP-violation in B d → J/ψK S . Contrary to common lore, we show that quantifiable constraints arise for new physics in either of the two SM operators, with the uncertain non-perturbative matrix element of the colour-suppressed (or equivalently, colour-octet) operator determined from the data. For new physics in the coefficient C c 1 , suppressed in the SM, we find (in addition to CP-conserving new physics) two perfectly viable, narrow bands of complex Wilson coefficients. Somewhat curiously, one of them contains a region where the fitted matrix element for the colour-suppressed operator is in agreement with naive factorization, contrarily to a widely held belief that large nonfactorizable contributions to B d → J/ψK S are implied by experimental data.

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Section: Rare Decays From Bsm Operatorssupporting

confidence: 79%

Charming new B-physics

Jäger

Kirk

Lenz

et al. 2020

J. High Energ. Phys.

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“…A comparison of the form factor at q 2 ¼ 0 is shown in Fig. 14, where we also include results from calculations using light-cone sum rules [34,35], a relativistic quark model [33], and NLO perturbative QCD [36].…”

Section: Comparison With Existing Resultsmentioning

confidence: 99%

“…The total decay rate is given by In Appendix C, we also provide partially integrated differential decay rates in evenly spaced q 2 bins. [34,35], NLO perturbative QCD (pQCD) [36], relativistic quark model (RQM) [33], and (2 þ 1)flavor lattice QCD (LQCD) from the HPQCD Collaboration [30], the RBC and UKQCD Collaborations [31], and the Fermilab Lattice and MILC Collaborations.…”

Section: A Decay Ratementioning

confidence: 99%

“…The decay B s → Klν has been studied by three other lattice-QCD groups, the HPQCD Collaboration [30], the RBC and UKQCD Collaborations [31], and the ALPHA Collaboration [32], each choosing different actions for the b-quark and for the light sea and valence quarks. Other previous calculations of the B s → Klν decay form factors are based on the relativistic quark model [33], light-cone sum rules [34,35], and next-to-leading-order (NLO) perturbative QCD [36]. In Sec.…”

Section: Introductionmentioning

confidence: 99%

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Bs→Kℓν decay from lattice QCD

Collaborations

2019

Phys. Rev. D

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We use lattice QCD to calculate the form factors f þ ðq 2 Þ and f 0 ðq 2 Þ for the semileptonic decay B s → Klν. Our calculation uses six MILC asqtad 2 þ 1 flavor gauge-field ensembles with three lattice spacings. At the smallest and largest lattice spacing the light-quark sea mass is set to 1=10 the strange-quark mass. At the intermediate lattice spacing, we use four values for the light-quark sea mass ranging from 1=5 to 1=20 of the strange-quark mass. We use the asqtad improved staggered action for the light valence quarks, and the clover action with the Fermilab interpolation for the heavy valence bottom quark. We use SU(2) hard-kaon heavy-meson rooted staggered chiral perturbation theory to take the chiral-continuum limit. A functional z expansion is used to extend the form factors to the full kinematic range. We present predictions for the differential decay rate for both B s → Kμν and B s → Kτν. We also present results for the forward-backward asymmetry, the lepton polarization asymmetry, ratios of the scalar and vector form factors for the decays B s → Klν and B s → D s lν. Our results, together with future experimental measurements, can be used to determine the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element jV ub j.

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“…0.258 ± 0.031 [11] 0.25 ± 0.05 [7] 0.31 ± 0.02 [16] 0.281 ± 0.038 [21] 0.301 ± 0.023 [18] f B→π T 0.19 ± 0.06 0.253 ± 0.028 [11] 0.21 ± 0.04 [7] 0.273 ± 0.021 [18] f B→K + 0.27 ± 0.08 0.331 ± 0.041 [11] 0.31 ± 0.04 [7] 0.395 ± 0.033 [18] f B→K T 0.25 ± 0.07 0.358 ± 0.037 [11] 0.27 ± 0.04 [7] 0.381 ± 0.027 [18] f B→D…”

mentioning

confidence: 99%

B →P and B →V form factors from B-meson light-cone sum rules beyond leading twist

Gubernari

Kokulu

Dyk

2019

J. High Energ. Phys.

197

251

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We provide results for the full set of form factors describing semileptonic Bmeson transitions to pseudoscalar mesons π, K,D and vector mesons ρ, K * ,D * . Our results are obtained within the framework of QCD Light-Cone Sum Rules with B-meson distribution amplitudes. We recalculate and confirm the results for the leading-twist twoparticle contributions in the literature. Furthermore, we calculate and provide new expressions for the two-particle contributions up to twist four. Following new developments for the three-particle distribution amplitudes, we calculate and provide new results for the complete set of three-particle contributions up to twist four. The form factors are computed numerically at several phase space points using up-to-date input parameters, including correlations across phase space points and form factors. We use a model ansatz for all contributing B-meson distribution amplitudes that is self-consistent up to twistfour accuracy. We find that the higher-twist two-particle contributions have a substantial impact on the results, and dominate over the three-particle contributions. Our numerical results, including correlations, are provided as machine-readable ancillary files. We discuss the qualitative phenomenological impact of our results on the present b anomalies.

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B s → Kℓν ℓ and B (s) → π(K)ℓ + ℓ − decays at large recoil and CKM matrix elements

Cited by 74 publications

References 42 publications

Charming new B-physics

Charming new B-physics

Bs→Kℓν decay from lattice QCD

B →P and B →V form factors from B-meson light-cone sum rules beyond leading twist

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