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Hyperon vector form factor from 2+1 flavor lattice QCD

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arxiv 1209.6115 v3 pith:BTOXB4PI submitted 2012-09-27 hep-lat hep-ph

Shoichi Sasaki This is my paper · ORCID
classification hep-lathep-ph
keywords hyperonvectorbreakingcorrectiondynamicalfactorformgauge
verification ladder T0 review T1 audit T2 compute T3 formal

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We present the first result for the hyperon vector form factor f_1 for Xi^0 -> Sigma^+ l bar{nu} and Sigma^- -> n l bar{nu} semileptonic decays from fully dynamical lattice QCD. The calculations are carried out with gauge configurations generated by the RBC and UKQCD collaborations with (2+1)-flavors of dynamical domain-wall fermions and the Iwasaki gauge action at beta=2.13, corresponding to a cutoff 1/a=1.73 GeV. Our results, which are calculated at the lighter three sea quark masses (the lightest pion mass down to approximately 330 MeV), show that a sign of the second-order correction of SU(3) breaking on the hyperon vector coupling f_1(0) is negative. The tendency of the SU(3) breaking correction observed in this work disagrees with predictions of both the latest baryon chiral perturbation theory result and large N_c analysis.

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Cited by 3 Pith papers

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  1. Patterns of flavour symmetry breaking in hadron matrix elements involving u, d and s quarks

    hep-lat 2019-09 conditional novelty 6.0 of 10

    Octet baryon matrix elements of octet currents obey a constrained SU(3) flavour-breaking expansion along the constant-singlet-mass trajectory, with one constraint at second order and no further constraints at third or...

  2. Unified study of hyperon semileptonic decays in a relativistic three-quark model

    hep-ph 2026-06 unverdicted novelty 4.0 of 10

    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 witho...

  3. CP violation studies at Super Tau-Charm Facility

    hep-ex 2025-02 conditional novelty 4.0 of 10

    A future Super Tau-Charm Facility is projected to test CP violation in hyperon, tau, and charm decays at 1e-4 to 1e-3 sensitivities and improve the kaon CPT mass-difference limit tenfold.

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