Physical results from 2+1 flavor domain wall QCD and SU(2) chiral perturbation theory

Alton, C., Antonio, D.J., Aoki, Y., Blum, T., Boyle, P.A., Christ, N.H., Cohen, S.D., Clark, M.A., Dawson, C., Donnellan, J.M., Flynn, J.M., Hart, A., Izubuchi, T., Juttner, A., Jung, C., Kennedy, A.D., Kenway, R.D., Li, M., Li, S., Lin, M.F., Mawhinney, R.D., Maynard, C.M., Ohta, S., Pendleton, B.J., Sachrajda, C.T., Sasaki, S., Scholz, E.E., Soni, A., Tweedie, R.J., Wennekers, J., Yamazaki, T., Zanotti, J.M. and for the RBC-UKQCD Collaborations, RBC-UKQCD Collaborations (2008) Physical results from 2+1 flavor domain wall QCD and SU(2) chiral perturbation theory. Pre-print, (arXiv:0804.0473), 1-133. (Submitted).


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We have simulated QCD using 2+1 flavors of domain wall quarks on a (2.74fm)3 volume with an inverse lattice scale of a−1=1.729(28) GeV. The up and down (light) quarks are degenerate in our calculations and we have used four values for the ratio of light quark masses to the strange (heavy) quark mass in our simulations: 0.217, 0.350, 0.617 and 0.884. We have measured pseudoscalar meson masses and decay constants, the kaon bag parameter BK and vector meson couplings. We have used SU(2) chiral perturbation theory, which assumes only the up and down quark masses are small, and SU(3) chiral perturbation theory to extrapolate to the physical values for the light quark masses. While next-to-leading order formulae from both approaches fit our data for light quarks, we find the higher order corrections for SU(3) very large, making such fits unreliable. We also find that SU(3) does not fit our data when the quark masses are near the physical strange quark mass. Thus, we rely on SU(2) chiral perturbation theory for accurate results. We use the masses of the Ω baryon, and the π and K mesons to set the lattice scale and determine the quark masses. We then find fπ=124.1(3.6)stat(6.9)systMeV, fK=149.6(3.6)stat(6.3)systMeV and fK/fπ=1.205(0.018)stat(0.062)syst. Using non-perturbative renormalization to relate lattice regularized quark masses to RI-MOM masses, and perturbation theory to relate these to MS¯ we find mMS¯ud(2GeV)=3.72(0.16)stat(0.33)ren(0.18)systMeV and mMS¯s(2GeV)=107.3(4.4)stat(9.7)ren(4.9)systMeV.

Item Type: Article
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Subjects: Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Physics and Astronomy > Southampton High Energy Physics
ePrint ID: 64187
Date Deposited: 05 Jan 2009
Last Modified: 08 Oct 2015 11:28

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