Speaker
Jose Gabriel Reyes-Rivera
(Michigan State University)
Description
The Yang-Mills gradient flow can be used to calculate the strange quark scalar content in nucleons using Lattice QCD. Given the renormalization properties of flowed operators, the procedure promises a reduction of the uncertainties in the determination of the spin independent (SI) elastic cross section of dark matter models involving WIMP-nucleon interactions. Chiral symmetry and a small flow-time expansion relate the scalar density at zero flow time to the pseudo-scalar density at non-zero flow time which can be calculated accurately on a lattice. The pseudo-scalar density is calculated on a 32^3×64 lattice using 2+1 flavor QCD gauge field configurations by PACS-CS with a spacing of a=0.0907 fm, β=1.90, m_π≅411 MeV. We show a preliminary result for the flow-time dependent vacuum to pion matrix elements and we discuss how it can be used to extract the strange quark scalar content in nucleons.
Primary author
Jose Gabriel Reyes-Rivera
(Michigan State University)