Ratios of exclusive to inclusive b to s lepton lepton observables discriminate between new physics and constant hadronic effects, with current data favoring new physics.
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A method to extract fs/fd and similar ratios from exclusive semi-leptonic B decays yields a 7% uncertainty constraint using existing measurements.
Form factors for B_q to J^P=2^+ tensor meson semileptonic decays are computed via light-cone QCD sum rules with external B state, yielding SM decay rates and LFU test ratios.
Reviews unitarity bounds for B-meson form factors, shows standard methods apply rigorously only to B→π, develops GG parametrization for general cases, and delivers combined-analysis predictions with public supplementary material.
The authors evaluate form factors via HQET and z-expansion for B_s to D_s** l nu decays, predict SM LFU ratios R_Ds0*=0.158(20) etc., and analyze NP effects in WET/SMEFT/2HDM showing scalar/tensor operators produce >2 sigma deviations in some observables.
Perturbative symmetry-breaking corrections shift the branching ratio and normal lepton polarization asymmetry by ~3% in B → K0*(1430) μ+μ−, so larger experimental deviations would indicate new physics.
Review surveying limits and prospects for flavor-violating decays of light axion-like particles, highlighting complementarity of lab, astro, and cosmo probes up to 10^12 GeV scales.
citing papers explorer
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Probing unknown nonperturbative effects in $b \to s \ell\ell$ with inclusive and exclusive observables
Ratios of exclusive to inclusive b to s lepton lepton observables discriminate between new physics and constant hadronic effects, with current data favoring new physics.
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Extracting production fractions of $b$ hadrons from exclusive semi-leptonic decays
A method to extract fs/fd and similar ratios from exclusive semi-leptonic B decays yields a 7% uncertainty constraint using existing measurements.
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Semileptonic $B_q$ decays to heavy tensor mesons
Form factors for B_q to J^P=2^+ tensor meson semileptonic decays are computed via light-cone QCD sum rules with external B state, yielding SM decay rates and LFU test ratios.
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Unitarity bounds and form-factor predictions for $B$-meson decays
Reviews unitarity bounds for B-meson form factors, shows standard methods apply rigorously only to B→π, develops GG parametrization for general cases, and delivers combined-analysis predictions with public supplementary material.
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A Comprehensive Analysis of $B_s \to D_s^{**}\ell\nu_\ell$ Decays Within and Beyond the Standard Model
The authors evaluate form factors via HQET and z-expansion for B_s to D_s** l nu decays, predict SM LFU ratios R_Ds0*=0.158(20) etc., and analyze NP effects in WET/SMEFT/2HDM showing scalar/tensor operators produce >2 sigma deviations in some observables.
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Symmetry-Breaking Effects on Form Factors and Observables in $B \to K_0^*(1430)\mu^+\mu^-$ Decay
Perturbative symmetry-breaking corrections shift the branching ratio and normal lepton polarization asymmetry by ~3% in B → K0*(1430) μ+μ−, so larger experimental deviations would indicate new physics.
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Flavor phenomenology of light dark particles
Review surveying limits and prospects for flavor-violating decays of light axion-like particles, highlighting complementarity of lab, astro, and cosmo probes up to 10^12 GeV scales.