This title appears in the Scientific Report :
2015
Please use the identifier:
http://hdl.handle.net/2128/8739 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevD.90.014510 in citations.
Feynman-Hellmann approach to the spin structure of hadrons
Feynman-Hellmann approach to the spin structure of hadrons
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 e...
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Personal Name(s): | Chambers, A. J. (Corresponding Author) |
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Horsley, R. / Nakamura, Y. / Perlt, H. / Pleiter, D. / Rakow, P. E. L. / Schierholz, G. / Schiller, A. / Stüben, H. / Young, R. D. / Zanotti, J. M. | |
Contributing Institute: |
Jülich Supercomputing Center; JSC John von Neumann - Institut für Computing; NIC |
Published in: | Physical Review D Physical review / D, 90 90 (2014 2014) 1 1, S. 014510 014510 |
Imprint: |
[S.l.]
Soc.
2014
2014-07-24 2014-07-01 |
DOI: |
10.1103/PhysRevD.90.014510 |
Document Type: |
Journal Article |
Research Program: |
Disconnected Contributions to Matrix Elements and Renormalization factors Hadron physics using background fields Computational Science and Mathematical Methods |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevD.90.014510 in citations.
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. |