Hunting for the strangeness content of the nucleon

Abstract

We present results for the strangeness contribution to the nucleon, <N|ss|N>, and to the spin of the nucleon, Delta s. By combining several variance reduction techniques for all-to-all propagators we are able to obtain gains in terms of computer time of factors of 25-30 for the disconnected loop that is needed within the calculation of Delta s, relative to the standard approach of just employing time partitioning/dilution. For <N|ss|n>, the error is dominated by the gauge noise.

Comments: 7 pages, talk presented at XXVI International Symposium on Lattice Field Theory (Lattice 2008), July 14-19, 2008, Williamsburg, Virgina, USA, v2: acknowledgments corrected. Otherwise identical