Speaker
Mr
Lukas Varnhorst
(Wuppertal University)
Description
The nucleon-sigma-terms are measures of the light-quark- and strange-quark-content of the nucleon. Especially the stangeness-content is of significant interest for dark-matter searches, as it determines the coupling of several dark matter candidates to hadronic matter. While the sigma-terms can not be measured directly they can be determined via lattice QCD from first principles.
The sigma-terms are related to the light- and strange-quark mass dependence of the nucleon mass by the Feynman-Hellmann-theorem. To measure this dependence we used $N_f=1+1+1+1$ ensembles generated with tree-level improved Symmanzik gauge action and tree-level improved clover Wilson fermions with three levels of HEX smearing at four values of the lattice spacing.
Primary author
Mr
Lukas Varnhorst
(Wuppertal University)
