D143 Effect of Reducing Fire Spread by Water

Nucleon sigma term and strange quark content from lattice QCD with exact chiral symmetry

“…A similarly poor convergence of HBChPT has been observed in our study in two-flavor QCD [8]. These observations suggest that, at least for In this study, therefore, we determine N|O lat S |N from the linear fit (29) and use the HBChPT fit only to estimate the systematic uncertainty of the chiral extrapolation. We obtain N|O lat S |N = 0.15(19)(18) from the spectrum method and 0.06(10)(10) from the ratio method.…”

“…Numerical results of the fit are summarized in Table VI. We also confirm that N|O lat S |N at the physical quark masses does not change significantly by excluding the data at the largest m ud from the fit and/or by including higher order terms in (29). We also test a fitting form based on SU(3) HBChPT to parametrize the observed quark mass dependence of N|ss|N .…”

“…This Boltzmann factor prohibits tunnelings among different topological sectors, and we simulate only trivial topological sector in this study. The effect of fixing topology is suppressed by inverse power of the lattice volume [28] and turned out to be small, typically 1 % level, in our previous studies [29,30]. This small effect can be safely neglected with our statistical accuracy for baryon observables.…”

“…For the spectrum method, we use C 2pt calculated in the course of our study of the light meson spectrum [29,30]. The low-mode contribution C lll 2pt (y, t, ∆t) is calculated using N e = 160 (80) low-modes on the 16 3 ×48 (24 3 ×48) lattice, and is averaged over the time-slice t with the spatial source point y kept fixed.…”

“…In order to reduce the computational cost of the re-calculation of the point-to-all propagators, these contributions are averaged over a limited set of (y, t) compared to that for C lll 2pt . The sets of the source point as well as the number of the low-modes N e are chosen differently for our calculations with the ratio and spectrum methods, because the latter uses C 2pt calculated in the course of our study of the light meson spectrum [29,30]. We summarize our choices for these two methods in the following subsections.…”