Physical Point Simulation in 2+1 Flavor Lattice QCD

Details Physical Point Simulation in 2+1 Flavor Lattice QCD Physical Point Simulation in 2+1 Flavor Lattice QCD

2009-11-13

arxiv.org/abs/0911.2561v2

Phys.Rev.D81:074503,2010

Physics

High Energy Physics

High Energy Physics - Lattice

20 pages, 17 figures, version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.81.074503

We present the results of the physical point simulation in 2+1 flavor lattice QCD with the nonperturbatively $O(a)$-improved Wilson quark action and the Iwasaki gauge action at $\beta=1.9$ on a $32^3 \times 64$ lattice. The physical quark masses together with the lattice spacing is determined with $m_\pi$, $m_K$ and $m_\Omega$ as physical inputs. There are two key algorithmic ingredients to make possible the direct simulation at the physical point: One is the mass-preconditioned domain-decomposed HMC algorithm to reduce the computational cost. The other is the reweighting technique to adjust the hopping parameters exactly to the physical point. The physics results include the hadron spectrum, the quark masses and the pseudoscalar meson decay constants. The renormalization factors are nonperturbatively evaluated with the Schr{\"o}dinger functional method. The results are compared with the previous ones obtained by the chiral extrapolation method.

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