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Title: Glue Spin and Helicity in the Proton from Lattice QCD

Journal Article · · Physical Review Letters

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
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (17)

Nucleon Spin and Momentum Decomposition Using Lattice QCD Simulations text January 2017
Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass journal May 2020
The spin structure of the nucleon journal January 2005
A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and Results journal June 2019
The spin structure of the nucleon journal June 2019
Hadrons and nuclei journal November 2019
Accessing high-momentum nucleons with dilute stochastic sources journal November 2018
Gluon momentum fraction of the nucleon from lattice QCD text January 2017
Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass text January 2020
The spin structure of the nucleon journal January 1994
Nucleon Spin and Momentum Decomposition Using Lattice QCD Simulations text January 2017
The Spin Structure of the Nucleon: Proceeding of International School of Nucleon Structure: 1st Course conference April 2017
Gluon momentum fraction of the nucleon from lattice QCD text January 2016
The nucleon spin and momentum decomposition using lattice QCD simulations text January 2017
Proton Mass Decomposition from the QCD Energy Momentum Tensor text January 2018
A guide to light-cone PDFs from Lattice QCD: an overview of approaches, techniques and results text January 2018
Unravelling High-Energy Hadron Structures with Lattice QCD text January 2018

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