Journal Article

FZJ-2015-03422

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Feynman-Hellmann approach to the spin structure of hadrons

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.

2014
Soc. [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/8739  doi:10.1103/PhysRevD.90.014510

Abstract: We perform a Nf=2+1 lattice QCD simulation to determine the quark spin fractions of hadrons using the Feynman-Hellmann theorem. By introducing an external spin operator to the fermion action, the matrix elements relevant for quark spin fractions are extracted from the linear response of the hadron energies. Simulations indicate that the Feynman-Hellmann method offers statistical precision that is comparable to the standard three-point function approach, with the added benefit that it is less susceptible to excited-state contamination. This suggests that the Feynman-Hellmann technique offers a promising alternative for calculations of quark line disconnected contributions to hadronic matrix elements. At the SU(3)-flavor symmetry point, we find that the connected quark spin fractions are universally in the range 55%–70% for vector mesons and octet and decuplet baryons. There is an indication that the amount of spin suppression is quite sensitive to the strength of SU(3) breaking.

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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)
3. Disconnected Contributions to Matrix Elements and Renormalization factors (hde12_20141101) (hde12_20141101)

Appears in the scientific report 2015

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

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