S. Hashimoto

Nucleon strange quark content from two-flavor lattice QCD with exact chiral symmetry

Strange quark content of the nucleon is calculated in dynamical lattice QCD employing the overlap fermion formulation. For this quantity, exact chiral symmetry guaranteed by the Ginsparg-Wilson relation is crucial to avoid large contamination due to a possible operator mixing with

Computing the hadronic vacuum polarization function by analytic continuation

bar{u}u+bar{d}d

Lattice study of the vacuum polarization function and determination of the strong coupling constant

. Gauge configurations are generated with two dynamical flavors on a 16^3 x 32 lattice at a lattice spacing a simeq 0.12fm. We directly calculate the relevant three-point function on the lattice including a disconnected strange quark loop utilizing the techniques of all-to-all quark propagator and low-mode averaging. Our result f_{T_s} = 0.032(8)(22), is in good agreement with our previous indirect estimate using the Feynman-Hellmann theorem.

Chiral properties of light mesons with

We propose a method to compute the hadronic vacuum polarization function on the lattice at continuous values of photon momenta bridging between the spacelike and timelike regions. We provide two independent demonstrations to show that this method leads to the desired hadronic vacuum polarization function in Minkowski spacetime. We present with the example of the leading-order QCD correction to the muon anomalous magnetic moment that this approach can provide a valuable alternative method for calculations of physical quantities where the hadronic vacuum polarization function enters.

N_f=2+1

We calculate the vacuum polarization functions on the lattice using the overlap fermion formulation. By matching the lattice data at large momentum scales with the perturbative expansion supplemented by the operator product expansion (OPE), we extract the strong coupling constant

overlap fermions

{ensuremath{alpha}}_{s}(ensuremath{mu})

Two-Photon Decay of the Neutral Pion in Lattice QCD

in two-flavor QCD as

The epsilon expansion at next-to-next-to-leading order with small imaginary chemical potential

{ensuremath{Lambda}}_{overline{MS}}^{(2)}=0.234(9)(genfrac{}{}{0}{}{+16}{ensuremath{-}0})text{ }text{ }mathrm{GeV}

Spontaneous chiral symmetry breaking on the lattice

, where the errors are statistical and systematic, respectively. In addition, from the analysis of the difference between the vector and axial-vector channels, we obtain some of the four-quark condensates.

Note on Rome-Southampton renormalization with smeared gauge fields

We present an update of the light meson spectrum with