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Type: Journal article
Title: Feynman-Hellmann approach to the spin structure of hadrons
Author: Chambers, A.
Horsley, R.
Nakamura, Y.
Perlt, H.
Pleiter, D.
Rakow, P.
Schierholz, G.
Schiller, A.
Stüben, H.
Young, R.
Zanotti, J.
Citation: Physical Review D - Particles, Fields, Gravitation, and Cosmology, 2014; 90(1):014510-1-014510-13
Publisher: American Physical Society
Issue Date: 2014
ISSN: 1550-2368
Statement of
A. J. Chambers, R. Horsley, Y. Nakamura, H. Perlt, D. Pleiter, P. E. L. Rakow, G. Schierholz, A. Schiller, H. Stüben, R. D. Young and J. M. Zanotti
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.
Rights: © 2014 American Physical Society
RMID: 0030015623
DOI: 10.1103/PhysRevD.90.014510
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Appears in Collections:Physics publications

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