Strange quark content of the nucleon and dark matter searches
arXiv:1301.1765
Abstract
The strange quark scalar content plays an important role in both the description of nucleon structure and in the determination of dark matter direct detection cross sections. As a measure of the strange-quark contribution to the nucleon mass, the strange-quark sigma term (σ_s) provides important insight into the nature of mass generation in QCD. The phenomenological determination of σ_s exhibits a wide range of variation, with values suggesting that the strange quark contributes anywhere between 0 and more than 30% of the nucleon mass. In the context of dark matter searches, coupled with relatively large Higgs coupling to strangeness, this variation dominates the uncertainty in predicted cross sections for a large class of dark matter models. Here we report on the recent results in lattice QCD, which are now giving a far more precise determination of σ_s than can be inferred from phenomenology. As a consequence, the lattice determinations of σ_s can now dramatically reduce the uncertainty in dark matter cross sections associated with the hadronic matrix elements.
12 pages, 6 figures; plenary talk presented at The 30th International Symposium on Lattice Field Theory - Lattice 2012, June 24-29, 2012 Cairns, Australia
References in corpus (13)
- Dark Matter Results from 225 Live Days of XENON100 Data
- Ab-initio Determination of Light Hadron Masses
- Hadronic Uncertainties in the Elastic Scattering of Supersymmetric Dark Matter
- Light hadrons from lattice QCD with light (u,d), strange and charm dynamical quarks
- First results from 2+1 dynamical quark flavors on an anisotropic lattice: light-hadron spectroscopy and setting the strange-quark mass
- Light hadron spectroscopy using domain wall valence quarks on an Asqtad sea
- Lattice QCD at the physical point: light quark masses
- Nucleon sigma term and strange quark content from lattice QCD with exact chiral symmetry
- Interpreting the recent results on direct search for dark matter particles in terms of relic neutralino
- Nucleon mass and sigma term from lattice QCD with two light fermion flavors
- Light baryon masses with dynamical twisted mass fermions
- Nucleon mass: from lattice QCD to the chiral limit
- SU(2) and SU(3) chiral perturbation theory analyses on baryon masses in 2+1 flavor lattice QCD