Feynman-Hellmann approach to the spin structure of hadrons


Chambers, AJ, Horsley, R, Nakamura, Y, Perlt, H, Pleiter, D, Rakow, PEL ORCID: 0000-0003-4486-2158, Schierholz, G, Schiller, A, Stueben, H, Young, RD et al (show 1 more authors) (2014) Feynman-Hellmann approach to the spin structure of hadrons. PHYSICAL REVIEW D, 90 (1). 014510-.

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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)-flavour 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.

Item Type: Article
Additional Information: 13 pages, 7 figures
Uncontrolled Keywords: hep-lat, hep-lat
Depositing User: Symplectic Admin
Date Deposited: 07 Dec 2018 14:44
Last Modified: 19 Jan 2023 01:09
DOI: 10.1103/PhysRevD.90.014510
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3029716
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