V_{us} from hyperon semileptonic decays

Abstract

A model-independent determination of the CKM matrix element V_{us} from five measured strangeness-changing hyperon semileptonic decays is performed. Flavor SU(3) symmetry breaking effects in the leading vector and axial-vector form factors are analyzed in the framework of the 1/N_c expansion of QCD. A fit to experimental data allows one to extract the value V_{us}=0.2199\pm 0.0026, which is comparable to the one from K_{e3} decays. This reconciliation is achieved through second-order symmetry breaking effects of a few percent in the form factors f_1, which increase their magnitudes over their SU(3) predictions.

23 pages, Revtex4, 12 tables, no figures

References in corpus (5)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Semileptonic Hyperon Decays
• Precise Determination of |V{us}| from Lattice Calculations of Pseudoscalar Decay Constants
• New, high statistics measurement of the K+ -> pi0 e+ nu (Ke3) branching ratio
• A Determination of the CKM Parameter |Vus|

Cited by in corpus (29)

• Beta decays as sensitive probes of lepton flavor universality
• V(us) Determination from Hyperon Semileptonic Decays
• Semileptonic decays of the light J(P)=1/2(+) ground state baryon octet
• Recent developments in SU(3) covariant baryon chiral perturbation theory
• Hyperon Semileptonic decay constants with flavor SU(3) symmetry breaking
• Weak Kaon Production off the Nucleon
• SU(3)-breaking corrections to the hyperon vector coupling $f_1(0)$ in covariant baryon chiral perturbation theory
• Chiral Corrections to the Hyperon Vector Form Factors
• Weak vector and axial-vector form factors in the chiral constituent quark model with configuration mixing
• Hyperon decay form factors in chiral perturbation theory
• Baryon magnetic moments in large-N_c chiral perturbation theory
• Semileptonic hyperon decays in the self-consistent SU(3) chiral quark-soliton model
• Hyperon vector form factor from 2+1 flavor lattice QCD
• Renormalization of the baryon axial vector current in large-N_c chiral perturbation theory: Effects of the decuplet-octet mass difference and flavor symmetry breaking
• Continuum limit of hyperon vector coupling $f_1(0)$ from 2+1 flavor domain wall QCD
• Hyperon semileptonic decays in QCD sum rules
• SU(3) breaking in hyperon transition vector form factors
• Analysis of the $\Sigma -n$ form factors with light-cone QCD sum rules
• The baryon vector current in the combined chiral and 1/Nc expansions
• Chiral extrapolation and finite-volume dependence of the hyperon vector couplings
• Chiral corrections to the vector and axial couplings of quarks and baryons
• Strange Mass Corrections to Hyperonic Semi-leptonic Decay in Statistical Model
• Properties of hyperons in chiral perturbation theory
• Baryon quadrupole moment in the 1/N(c) expansion of QCD
• Baryons and baryoniums in the perspective of QCD sum rules
• Study of vector and axial-vector form factors and the decay parameters for the semileptonic hyperon decays
• Properties of the ground-state baryons in chiral perturbation theory
• Measurements of the Absolute Branching Fraction of the Semileptonic Decay ${\mathbf{\Xi }}^{-}\to \mathbf{\Lambda }{\mathbf{e}}^{-}{\bar{\nu }}_{\mathbf{e}}$ and the Axial Charge of the ${\mathbf{\Xi }}^{-}$
• Status of the CKM Matrix