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

Abstract

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.

7 pages, 6 figures, Talk given at 26th International Symposium on Lattice Field Theory (Lattice 2008), Williamsburg, Virginia, 14-20 Jul 2008

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• Light hadron spectroscopy using domain wall valence quarks on an Asqtad sea
• Nucleon sigma term and strange quark content from lattice QCD with exact chiral symmetry
• Nucleon mass: from lattice QCD to the chiral limit
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Cited by in corpus (6)

• Light mixed sneutrinos as thermal dark matter
• Strangeness content of the pion in the U(3) Nambu-Jona-Lasinio model
• Strange quark content of the nucleon
• Physics results from dynamical overlap fermion simulations
• The strange quark content of the nucleon in 2+1 flavor lattice QCD
• Improved method for calculating nucleon strangeness