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Contributions of strange quarks to the mass and spin of the nucleon,characterized by the observables f_Ts and Delta s, respectively, areinvestigated within lattice QCD. The calculation employs a 2+1-flavormixed-action lattice scheme, thus treating the strange quark degrees of freedomin dynamical fashion. Numerical results are obtained at three pion masses, m_pi= 495 MeV, 356 MeV, and 293 MeV, renormalized, and chirally extrapolated to thephysical pion mass. The value extracted for Delta s at the physical pion massin the MSbar scheme at a scale of 2 GeV is Delta s = -0.031(17), whereas thestrange quark contribution to the nucleon mass amounts to f_Ts =0.046(11). Inthe employed mixed-action scheme, the nucleon valence quarks as well as thestrange quarks entering the nucleon matrix elements which determine f_Ts andDelta s are realized as domain wall fermions, propagators of which areevaluated in MILC 2+1-flavor dynamical asqtad quark ensembles. The use ofdomain wall fermions leads to mild renormalization behavior which provesespecially advantageous in the extraction of f_Ts.

Strange quark contributions to nucleon mass and spin from lattice QCD