Nonperturbatively renormalized glue momentum fraction at the physical pion mass from lattice QCD
Name
PhysRevD.98.074506.pdf
Description
Published version
Size
1.01 MB
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Unknown
Checksum (MD5)
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Author(s)
Yang, Yi-Bo
Gong, Ming
Liang, Jian
Lin, Huey-Wen
Liu, Keh-Fei
Pefkou, Dimitra Anastasia
Shanahan, Phiala E
Date Issued
October 2018
Journal
Physical Review D
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2018 authors. Published by the American Physical Society. We present the first nonperturbatively renormalized determination of the glue momentum fraction x g in the nucleon, based on lattice-QCD simulations at the physical pion mass using the cluster-decomposition error reduction technique. We provide the first practical strategy to renormalize the gauge energy-momentum tensor nonperturbatively in the regularization-independent momentum-subtraction (RI/MOM) scheme and convert the results to the MS̄ scheme with one-loop matching. The simulation results show that the cluster-decomposition error reduction technique can reduce the statistical uncertainty of its renormalization constant by a factor of O(300) in calculations using a typical state-of-the-art lattice volume, and the nonperturbatively renormalized x g is shown to be independent of the lattice definitions of the gauge energy-momentum tensor up to discretization errors. We determine the renormalized x gMS̄(2 GeV) to be 0.47(4)(11) at the physical pion mass, which is consistent with the experimentally determined value.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1103/PHYSREVD.98.074506
