B →Vℓ+ℓ− in the Standard Model from light-cone sum rules
By Aoife Bharucha, David M. Straub, R. Zwicky. 2015
474 citations recorded by the source corpus.
A bstractWe present Bq → ρ, Bq → ω, Bq → K∗, Bs → K∗ and Bs → ϕ form factors from light-cone sum rules (LCSR) at Oαs$$ \mathcal{O}\left({\alpha}_s\right) $$ for twist-2 and 3 and Oαs0$$ \mathcal{O}\left({\alpha}_s^0\right) $$ for twist-4 with updated hadronic input parameters. Three asymptotic light-cone distribution amplitudes of twist-4 (and 5) are determined, necessary for the form factors to obey the equations of motion. It is argued that the latter constrain the uncertainty of tensor-to-vector form factor ratios thereby improving the prediction of zeros of helicity amplitudes of major importance for B → K∗ℓℓ angular observables. We provide easy-to-use fits to the LCSR results, including the full error correlation matrix, in all modes at low q2 as well as combined fits to LCSR and lattice results covering the entire kinematic range for Bq → K∗, Bs → K∗ and Bs → ϕ. The error correlation matrix avoids the problem of overestimating the uncertainty in phenomenological applications. Using the new form factors and recent computations of non-factorisable contributions we provide Standard Model predictions for B → K∗γ as well as B → K∗ℓ+ℓ− and Bs → ϕμ+μ− at low dilepton invariant mass. Employing our B → (ρ,ω) form factor results we extract the CKM element |Vub| from the semileptonic decays B → (ρ, ω)ℓν and find good agreement with other exclusive determinations.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/c4c816e918c6a366997bcd8b2745cc1465993f8d
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In Nuclear and High Energy Physics
Citations in the corpus
- Measurement of CP-Averaged Observables in the B (2020, methodology): “The nuisance parameters include a recent treatment of the subleading corrections [43,44] that was not available at the time of the previous analysis.”
- Simultaneous explanation of the RK and R(D(⁎)) puzzles (2014, methodology): “5σ disagreement with the predictions of the SM, which are based on lattice QCD [14, 15] and QCD sum rules [16].”
- Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data (2017, unknown): “[41], obtained with a different method.”
- New physics in b → s μ + μ − after the measurement of R K * (2017, methodology): “5σ disagreement with the predictions of the SM, which are based on lattice QCD [15, 16] and QCD sum rules [17].”
- Patterns of flavour violation in models with vector-like quarks (2016, background): “The corresponding results for B → K∗ form factors in the two regions are from the LCSR calculation [123] and the lattice calculations [124,125].”
- B →P and B →V form factors from B-meson light-cone sum rules beyond leading twist (2018, methodology): “We carry out such fits for the BSZ parametrization [17] in the next”