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.
Publisher Copyright:
© Copyright owned by the author(s).
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.
UR - http://www.scopus.com/inward/record.url?scp=85053291997&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85053291997&partnerID=8YFLogxK
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 -