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Rare decay B -> K ll form factors from lattice QCD

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arxiv 1306.2384 v3 pith:5RCOTOQU submitted 2013-06-10 hep-lat hep-ph

Rare decay B -> K ll form factors from lattice QCD

classification hep-lat hep-ph
keywords formlatticecalculationdecayfactorfactorsformulationmodel
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We calculate, for the first time using unquenched lattice QCD, form factors for the rare decay B -> Kll in and beyond the Standard Model. Our lattice QCD calculation utilizes a nonrelativistic QCD formulation for the b valence quarks, the highly improved staggered quark formulation for the light valence quarks, and employs the MILC 2+1 asqtad ensembles. The form factor results, based on the z expansion, are valid over the full kinematic range of q^2. We construct the ratios f0/f+ and fT/f+, which are useful in constraining new physics and verifying effective theory form factor symmetry relations. We also discuss the calculation of Standard Model observables.

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Cited by 4 Pith papers

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  1. A Dispersive Look at Rare $B$-meson Semileptonic Decays

    hep-ph 2026-07 conditional novelty 6.0

    A global fit of b→s ℓ+ℓ− and b→s νν data finds that hadronic charm-loop effects, not a new short-distance coupling C9, can explain the observed anomalies.

  2. A Dispersive Look at Rare $B$-meson Semileptonic Decays

    hep-ph 2026-07 conditional novelty 5.5

    Lattice-only Dispersive Matrix form factors enlarge large-recoil uncertainties and, with new angular data, favour long-distance hadronic effects over a short-distance C9 New Physics shift.

  3. Investigating New Physics through the Observables of Semileptonic $B_{s}\to K^{\ast}(\to K \pi)\mu^{+}\mu^{-}$ Decay

    hep-ph 2025-06 unverdicted novelty 3.0

    Model-independent calculation of differential branching ratio, forward-backward asymmetry, polarization, and angular coefficients in Bs → K* μ+μ- with 1D and 2D new physics scenarios in C7^NP, C9^(prime)NP, and C10^(p...

  4. FLAG Review 2024

    hep-lat 2024-11 accept novelty 2.0

    The FLAG 2024 review provides updated averages of lattice QCD determinations for quark masses, decay constants, form factors, mixing parameters, and nucleon matrix elements.