TY  - CONF
AU  - Horsley, Roger
AU  - Nakamura, Yoshifumi
AU  - Perlt, Holger
AU  - Pleiter, D.
AU  - Rakow, P. E. L.
AU  - Schierholz, Gerrit
AU  - Schiller, Arwed
AU  - Stuben, Hinnerk
AU  - Young, Ross D.
AU  - Zanotti, J. M.
TI  - The strange quark contribution to the spin of the nucleon
PB  - Sissa Medialab             Trieste, Italy
M1  - FZJ-2020-00370
SP  - 119
PY  - 2019
AB  - 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.
T2  - The 36th Annual International Symposium on Lattice Field Theory
CY  - 22 Jul 2018 - 28 Jul 2018, Michigan State University (East Lansing)
Y2  - 22 Jul 2018 - 28 Jul 2018
M2  - Michigan State University, East Lansing
LB  - PUB:(DE-HGF)8 ; PUB:(DE-HGF)7
DO  - DOI:10.22323/1.334.0119
UR  - https://juser.fz-juelich.de/record/872905
ER  -