Lattice QCD supplies Standard Model branching-fraction predictions for all four K to l nu l' l' channels with controlled uncertainties of 2-7 percent, consistent with published data and preliminary NA62 results.
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Lattice QCD yields the scalar and tensor form factors for Λ→pℓν̄ℓ as functions of q², providing a model-independent input to constrain non-standard charged-current interactions via the predicted R^{μe} ratio compared to experiment.
An azimuthal asymmetry in the pion from tau decays in specific neutrino-hyperon processes provides a CP-odd signal for beyond-Standard-Model physics encoded in dimension-six operators.
Wave functions fixed from a mass-spectrum fit in the relativistic three-quark model are used to compute branching fractions, LFU ratios, and the complete set of octet hyperon semileptonic transition form factors without extra parameters, agreeing with data and lattice results where available.
Light-front quark model with nonvalence contributions predicts branching ratios for Λ→p ℓ ν̄ decays of 8.32×10^{-4} (electron) and 1.31×10^{-4} (muon) consistent with BESIII.
Branching fraction B(Λ → p μ⁻ ν̄_μ) measured as (1.462 ± 0.016 ± 0.100 ± 0.011) × 10^{-4}, improving prior precision by a factor of two and yielding R^{μe} = 0.175 ± 0.012 consistent with the Standard Model.
Cross sections for ℓ⁻ + p → ν_ℓ + Λ at e⁺e⁻ colliders increase with energy but show large uncertainties from baryonic form factor choices in QCD sum rules and lattice QCD.
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Scalar and Tensor Form Factors for $\Lambda \rightarrow p\ell \bar{\nu}_\ell$ from Lattice QCD
Lattice QCD yields the scalar and tensor form factors for Λ→pℓν̄ℓ as functions of q², providing a model-independent input to constrain non-standard charged-current interactions via the predicted R^{μe} ratio compared to experiment.
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Unified study of hyperon semileptonic decays in a relativistic three-quark model
Wave functions fixed from a mass-spectrum fit in the relativistic three-quark model are used to compute branching fractions, LFU ratios, and the complete set of octet hyperon semileptonic transition form factors without extra parameters, agreeing with data and lattice results where available.
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Semileptonic Decays of $\Lambda \to p \ell^{-} \bar{\nu}_{\ell}$ in the Light-Front Dynamics
Light-front quark model with nonvalence contributions predicts branching ratios for Λ→p ℓ ν̄ decays of 8.32×10^{-4} (electron) and 1.31×10^{-4} (muon) consistent with BESIII.
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The feasibility of single ${\Lambda}$ production via ${\ell}^{-}$ $+$ $p$ ${\to}$ ${\Lambda}$ $+$ ${\nu}_{\ell}$ at $e^{+}e^{-}$ colliders
Cross sections for ℓ⁻ + p → ν_ℓ + Λ at e⁺e⁻ colliders increase with energy but show large uncertainties from baryonic form factor choices in QCD sum rules and lattice QCD.