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Type: Conference paper
Title: Strange quark content of the nucleon and dark matter searches
Author: Young, R.
Citation: PoS (Lattice 2012); 014
Publisher: Proceedings of Science
Publisher Place: Italy
Issue Date: 2012
ISSN: 1824-8039
Conference Name: International Symposium on Lattice Field Theory (30th : 2012 : Cairns, Australia)
Statement of
R. D. Young
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 (ss) provides important insight into the nature of mass generation in QCD. The phenomenological determination of ss 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 ss than can be inferred from phenomenology. As a consequence, the lattice determinations of ss can now dramatically reduce the uncertainty in dark matter cross sections associated with the hadronic matrix elements.
Description: Extent: 12p.
Rights: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence
DOI: 10.22323/1.164.0014
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Special Research Centre for the Subatomic Structure of Matter publications

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