Calculation of the nucleon sigma term and strange quark content with two flavors of dynamical overlap fermions

Details Calculation of the nucleon sigma term and strange quark content with two flavors of dynamical overlap fermions Calculation of the nucleon sigma term and strange quark content with two flavors of dynamical overlap fermions

2008-10-23

arxiv.org/abs/0810.4223v1

PoS LATTICE2008:126,2008

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 6 figures, Talk given at 26th International Symposium on Lattice Field Theory (Lattice 2008), Williamsburg, Virginia,

Scientific paper

We present a calculation of the nucleon sigma term on two-flavor QCD configurations with dynamical overlap fermions. We analyse the lattice data for the nucleon mass using the baryon chiral perturbation theory. Using partially quenched data sets, we extract the connected and disconnected contributions to the nucleon sigma term separately. Chiral symmetry on the lattice simplifies the determination of the disconnected contribution. We find that the strange quark content, which determines the neutralino dark matter reaction rate with nucleon through the Higgs boson exchange, is much smaller than the previous lattice results.

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