Contribution to a conference proceedings/Contribution to a book

FZJ-2020-00370

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The strange quark contribution to the spin of the nucleon

Horsley, R. (Corresponding author) ; Nakamura, Y. ; Perlt, H. ; Pleiter, D.FZJ* ; Rakow, P. E. L. ; Schierholz, G. ; Schiller, A. ; Stuben, H. ; Young, R. D. ; Zanotti, J. M.

2019
Sissa Medialab Trieste, Italy

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Please use a persistent id in citations: http://hdl.handle.net/2128/23947  doi:10.22323/1.334.0119

Abstract: 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.

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 513 - Supercomputer Facility (POF3-513) (POF3-513)

Appears in the scientific report 2019

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