期刊
PHYSICAL REVIEW D
卷 92, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.92.114517
关键词
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资金
- Australian Research Council [FT120100821, FT100100005, DP140103067]
- DFG [SCHI 422/10-1]
- STFC [ST/J000329/1, ST/M006530/1, ST/K502145/1, ST/L000458/1, ST/I505805/1, ST/L000431/1, ST/M503629/1, ST/G00062X/1, ST/J50113X/1, ST/I506896/1, ST/G000522/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K502145/1, ST/J000329/1, ST/I505805/1, ST/M006530/1, ST/L000458/1, ST/G00062X/1, ST/L000431/1, ST/M503629/1, ST/I506896/1, ST/J50113X/1, ST/G000522/1] Funding Source: researchfish
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.
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