This title appears in the Scientific Report :
2015
Please use the identifier:
http://hdl.handle.net/2128/11117 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevD.92.114517 in citations.
Disconnected contributions to the spin of the nucleon
Disconnected contributions to the spin of the nucleon
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 p...
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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: |
John von Neumann - Institut für Computing; NIC Jülich Supercomputing Center; JSC |
Published in: | Physical Review D Physical review / D, 92 92 (2015 2015) 11 11, S. 114517 114517 |
Imprint: |
[S.l.]
Soc.
2015
2015-12-30 2015-12-01 |
DOI: |
10.1103/PhysRevD.92.114517 |
Document Type: |
Journal Article |
Research Program: |
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.92.114517 in citations.
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. |