Journal Article

FZJ-2016-00960

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Disconnected contributions to the spin of the nucleon

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

2015
Soc. [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/11117  doi:10.1103/PhysRevD.92.114517

Abstract: The spin decomposition of the proton is a long-standing topic of much interest in hadronic physics. Lattice QCD has had much success in calculating the connected contributions to the quark spin. However complete calculations, which necessarily involve gluonic and strange-quark contributions, still present some challenges. These “disconnected” contributions typically involve small signals hidden against large statistical backgrounds and rely on computationally intensive stochastic techniques. In this work we demonstrate how a Feynman-Hellmann approach may be used to calculate such quantities, by measuring shifts in the proton energy arising from modifications to the QCD action. We find a statistically significant nonzero result for the disconnected quark spin contribution to the proton of about −5% at a pion mass of 470 MeV.

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)
2. John von Neumann - Institut für Computing (NIC)

Research Program(s):

1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)
2. Hadron physics using background fields (hlz22_20161101) (hlz22_20161101)

Appears in the scientific report 2015

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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