Glue Spin and Helicity in the Proton from Lattice QCD
- Univ. of Kentucky, Lexington, KY (United States)
- George Washington Univ., Washington, DC (United States)
- Univ. of Maryland, College Park, MD (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
We report the first lattice QCD calculation of the glue spin in the nucleon. The lattice calculation is carried out with valence overlap fermions on 2+1 flavor DWF gauge configurations on four lattice spacings and four volumes including an ensemble with physical values for the quark masses. The glue spin S_G in the Coulomb gauge in the MSbar scheme is obtained with the 1-loop perturbative matching. We find the results fairly insensitive to lattice spacing and quark masses. We also find that the proton momentum dependence of S_G in the range 0≤|p|<1.5 GeV is very mild, and we determine it in the large momentum limit to be S_G= 0.251(47)(16) at the physical pion mass in the MSbar scheme at μ^2= 10 GeV^2. If the matching procedure in large momentum effective theory is neglected, S_G is equal to the glue helicity measured in high-energy scattering experiments.
- Research Organization:
- Univ. of Kentucky, Lexington, KY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- χQCD Collaboration
- Grant/Contract Number:
- SC0013065; FG02-95ER40907; FG02-93ER-40762; AC02-05CH11231; AC05-00OR22725
- OSTI ID:
- 1599109
- Alternate ID(s):
- OSTI ID: 1345860
- Report Number(s):
- DOE-UKY-13065-1609.05937; PRLTAO; arXiv:1609.05937; TRN: US2103424
- Journal Information:
- Physical Review Letters, Vol. 118, Issue 10; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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