Lattice2010

Session

Parallel 26: Hadronic structure and interactions

15 Jun 2010, 16:40

Villasimius, Sardinia

54. Nucleon strange quark content in 2+1 flavor QCD

Kohei Takeda (University of Tsukuba)

15/06/2010, 16:40

Hadronic structure and interactions

We calculate the nucleon strange quark content in 2+1 flavor QCD using the overlap fermion for both sea and valence quarks. The disconnected three-point function is directly calculated using the all-to-all propagator. We emphasize the role of chiral symmetry in the renormalization of the strange quark content.

99. Strangeness in the nucleon from a mixed action calculation

Michael Engelhardt (New Mexico State University)

15/06/2010, 17:00

Hadronic structure and interactions

Both the scalar strange content of the nucleon, as embodied in the F_Ts parameter, as well as the strange quark contribution to nucleon spin, Delta s, are investigated in a mixed action scheme employing domain wall valence quarks and quark loops on MILC asqtad dynamical fermion ensembles. Results are presented for pion masses 495 MeV and 356 MeV.

256. Improved method for computing nucleon strangeness

Walter Freeman (University of Arizona)

15/06/2010, 17:20

Hadronic structure and interactions

The strange quark content of the nucleon, <N|ss|N>, as well as other matrix elements, can be calculated on the lattice by examining correlations between the nucleon propagator and the quark condensate. The largest contribution to statistical error comes from coincidental correlations between the propagator and fluctuations in the condensate far from the propagation region that contribute only...