%0 Conference Paper
%A Horsley, Roger
%A Nakamura, Y.
%A Perlt, H.
%A Pleiter, D.
%A Rakow, P. E. L.
%A Schierholz, Gerrit
%A Schiller, A.
%A Stuben, H.
%A Young, R. D.
%A Zanotti, J. M.
%T The strange quark contribution to the spin of the nucleon
%J Proceedings of Science / International School for Advanced Studies
%V (LATTICE2018)
%N arXiv:1901.04792
%@ 1824-8039
%C Trieste
%I SISSA
%M PUBDB-2019-02503
%M arXiv:1901.04792
%M ADP-18-32-T1080
%M DESY-18-220
%M Liverpool-LTH-1190
%P 119
%D 2019
%X Quark line disconnected matrix elements of an operator, such as the axial current, are difficult to compute on the lattice. The standard method uses a stochastic estimator of the operator, which is generally very noisy. We discuss and develop further our alternative approach using the Feynman-Hellmann theorem which involves only evaluating two-point correlation functions. This is applied to computing the contribution of the quark spin to the nucleon and in particular for the strange quark. In this process we also pay particular attention to the development of an SU(3) flavour breaking expansion for singlet operators.
%B The 36th Annual International Symposium on Lattice Field Theory
%C 22 Jul 2018 - 28 Jul 2018, Michigan State University (East Lansing)
Y2 22 Jul 2018 - 28 Jul 2018
M2 Michigan State University, East Lansing
%F PUB:(DE-HGF)16 ; PUB:(DE-HGF)29 ; PUB:(DE-HGF)8
%9 Journal ArticleReportContribution to a conference proceedings
%R 10.22323/1.334.0119
%U https://bib-pubdb1.desy.de/record/423245