Hyperon vector form factors with 2+1 flavor dynamical domain-wall fermions

Shoichi Sasaki

Hyperon vector form factors with 2+1 flavor dynamical domain-wall fermions

Research output: Contribution to journal › Conference article › peer-review

Abstract

We report updated results of the hyperon vector form factor f₁ for Ξ⁰ → Σ⁺ and Σ⁻ → n semilep-tonic 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 β = 2.13, corresponding to a cutoff a⁻ ¹ = 1.73 GeV. Our results, which are calculated at the lightest two sea quark masses (pion mass down to approximately 330 MeV), show that a sign of the second-order correction of SU(3) breaking on hyperon vector coupling f₁(0) is likely negative. The tendency of the SU(3) breaking correction observed in this work disagrees predictions of both the latest baryon chiral perturbation theory result and large N_c analysis.

Original language	English
Journal	Proceedings of Science
Volume	139
Publication status	Published - 2011
Externally published	Yes
Event	29th International Symposium on Lattice Field Theory, Lattice 2011 - Squaw Valley, Lake Tahoe, United States Duration: 2011 Jul 10 → 2011 Jul 16

ASJC Scopus subject areas

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@article{d77c7e61dbcc4f01bacee9a7e4f858e2,

title = "Hyperon vector form factors with 2+1 flavor dynamical domain-wall fermions",

abstract = "We report updated results of the hyperon vector form factor f1 for Ξ0 → Σ+ and Σ− → n semilep-tonic 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 β = 2.13, corresponding to a cutoff a− 1 = 1.73 GeV. Our results, which are calculated at the lightest two sea quark masses (pion mass down to approximately 330 MeV), show that a sign of the second-order correction of SU(3) breaking on hyperon vector coupling f1(0) is likely negative. The tendency of the SU(3) breaking correction observed in this work disagrees predictions of both the latest baryon chiral perturbation theory result and large Nc analysis.",

author = "Shoichi Sasaki",

note = "Funding Information: We thank C. Jung for help with numerical calculations on the IBM BlueGene/L supercomputer. This work is supported by the JSPS Grants-in-Aid for Scientific Research (C) (No. 19540265), Scientific Research on Innovative Areas (No. 21105504 and No. 23105704) and the Large Scale Simulation Program No.09/10-02 (FY2010) of High Energy Accelerator Research Organization (KEK). Numerical calculations reported here were carried out at KEK supercomputer system and also on the T2K supercomputer at ITC, University of Tokyo.; 29th International Symposium on Lattice Field Theory, Lattice 2011 ; Conference date: 10-07-2011 Through 16-07-2011",

year = "2011",

language = "English",

volume = "139",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

}

TY - JOUR

T1 - Hyperon vector form factors with 2+1 flavor dynamical domain-wall fermions

AU - Sasaki, Shoichi

N1 - Funding Information: We thank C. Jung for help with numerical calculations on the IBM BlueGene/L supercomputer. This work is supported by the JSPS Grants-in-Aid for Scientific Research (C) (No. 19540265), Scientific Research on Innovative Areas (No. 21105504 and No. 23105704) and the Large Scale Simulation Program No.09/10-02 (FY2010) of High Energy Accelerator Research Organization (KEK). Numerical calculations reported here were carried out at KEK supercomputer system and also on the T2K supercomputer at ITC, University of Tokyo.

PY - 2011

Y1 - 2011

N2 - We report updated results of the hyperon vector form factor f1 for Ξ0 → Σ+ and Σ− → n semilep-tonic 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 β = 2.13, corresponding to a cutoff a− 1 = 1.73 GeV. Our results, which are calculated at the lightest two sea quark masses (pion mass down to approximately 330 MeV), show that a sign of the second-order correction of SU(3) breaking on hyperon vector coupling f1(0) is likely negative. The tendency of the SU(3) breaking correction observed in this work disagrees predictions of both the latest baryon chiral perturbation theory result and large Nc analysis.

AB - We report updated results of the hyperon vector form factor f1 for Ξ0 → Σ+ and Σ− → n semilep-tonic 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 β = 2.13, corresponding to a cutoff a− 1 = 1.73 GeV. Our results, which are calculated at the lightest two sea quark masses (pion mass down to approximately 330 MeV), show that a sign of the second-order correction of SU(3) breaking on hyperon vector coupling f1(0) is likely negative. The tendency of the SU(3) breaking correction observed in this work disagrees predictions of both the latest baryon chiral perturbation theory result and large Nc analysis.

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M3 - Conference article

AN - SCOPUS:85053291997

VL - 139

JO - Proceedings of Science

JF - Proceedings of Science

SN - 1824-8039

T2 - 29th International Symposium on Lattice Field Theory, Lattice 2011

Y2 - 10 July 2011 through 16 July 2011

ER -