Octet-baryon axial-vector charges and SU(3)-breaking effects in the semileptonic hyperon decays

Abstract

The octet-baryon axial-vector charges and the g1/f1 ratios measured in the semileptonic hyperon decays are studied up to O(p^3) using the covariant baryon chiral perturbation theory with explicit decuplet contributions. We clarify the role of different low-energy constants and find a good convergence for the chiral expansion of the axial-vector charges of the baryon octet, g1(0), with O(p^3) corrections typically around 20% of the leading ones. This is a consequence of strong cancellations between different next-to-leading order terms. We show that considering only non-analytic terms is not enough and that analytic terms appearing at the same chiral order play an important role in this description. The same effects still hold for the chiral extrapolation of the axial-vector charges and result in a rather mild quark-mass dependence. As a result, we report a determination of the leading order chiral couplings, D=0.623(61)(17) and F=0.441(47)(2), as obtained from a completely consistent chiral analysis up to O(p^3). Furthermore, we note that the appearance of an unknown low-energy constant precludes the extraction of the proton octet-charge from semileptonic decay data alone, which is relevant for an analysis of the composition of the proton spin.

18 pages, 5 figures

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Cited by in corpus (34)

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• CP-violating decays of the pseudoscalars eta and eta' and their connection to the electric dipole moment of the neutron
• The electromagnetic form factors of the transition from the spin-3/2 Sigma to the Lambda hyperon
• New physics in $s\to d$ semileptonic transitions: rare hyperon vs. kaon decays
• Contact interaction analysis of octet baryon axialvector and pseudoscalar form factors
• Leading order mesonic and baryonic SU(3) low energy constants from $N_f=3$ lattice QCD
• Hyperon semileptonic decays in QCD sum rules
• Systematic study of octet-baryon electromagnetic form factors in covariant chiral perturbation theory
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• Axial-vector form factors of the baryon octet and chiral symmetry
• Threshold pion electro- and photoproduction off nucleons in covariant chiral perturbation theory
• Deuteron EDM induced by CP violating couplings of pseudoscalar mesons
• Generalized parton distributions of sea quarks in the proton from nonlocal chiral effective theory
• Baryon number violation involving tau leptons
• The electromagnetic Sigma-to-Lambda transition form factors with coupled-channel effects in the space-like region
• Updated determination of light-cone distribution amplitudes of octet baryons in lattice QCD
• Weak interaction axial form factors of the octet baryons in nuclear medium
• Low-energy axial-vector transitions from decuplet to octet baryons
• Axial transition form factors of octet baryons in the perturbative chiral quark model
• Investigations on the flavor-dependent axial charges of the octet baryons
• Hyperon production in quasielastic ${\bar{\nu }}_{\tau }-$nucleon scattering
• Octet and decuplet baryon self-energies in relativistic SU(3) chiral effective theory
• Chiral Analysis of the Nucleon Mass and Sigma Commutator
• A model independent method for quantitative estimation of $SU(3)$ flavor symmetry breaking using Dalitz plot
• Non-Perturbative Theory of Dispersion Interactions
• Baryons and baryoniums in the perspective of QCD sum rules
• The isoscalar octet axial form factor of the nucleon from lattice QCD
• New Physics Searches at Kaon and Hyperon Factories
• 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 ${\mathbf{\Xi }}^{-}$
• The Strange Physics of Dark Baryons