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

Abstract

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 domain-wall fermion gauge configurations on four lattice spacings and four volumes including an ensemble with physical values for the quark masses. The glue spin SG in the Coulomb gauge in the modified minimal subtraction (¯¯¯¯¯¯MS) scheme is obtained with one-loop perturbative matching. We find the results fairly insensitive to lattice spacing and quark masses. We also find that the proton momentum dependence of SG in the range 0≤|→p|<1.5 GeV is very mild, and we determine it in the large-momentum limit to be SG=0.251(47)(16) at the physical pion mass in the ¯¯¯¯¯¯MS scheme at μ2=10  GeV2. If the matching procedure in large-momentum effective theory is neglected, SG is equal to the glue helicity measured in high-energy scattering experiments.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [3]
  1. Univ. of Kentucky, Lexington, KY (United States). Dept. of Physics and Astronomy
  2. George Washington Univ., Washington, DC (United States)
  3. Univ. of Maryland, College Park, MD (United States). Maryland Center for Fundamental Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
Publication Date:
Research Org.:
Univ. of California, Oakland, CA (United States); UT-Battelle LLC/ORNL, Oak Ridge, TN (Unted States); Univ. of Maryland, College Park, MD (United States); George Washington Univ., Washington, DC (United States); Univ. of Kentucky, Lexington, KY (United States); Oak Ridge National Laboratory, Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
χQCD Collaboration
OSTI Identifier:
1565612
DOE Contract Number:  
AC02-05CH11231; AC05-00OR22725; FG02-93ER40762; FG02-95ER40907; SC0013065
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 10; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
Physics

Citation Formats

Yang, Yi-Bo, Sufian, Raza Sabbir, Alexandru, Andrei, Draper, Terrence, Glatzmaier, Michael J., Liu, Keh-Fei, and Zhao, Yong. Glue Spin and Helicity in the Proton from Lattice QCD. United States: N. p., 2017. Web. doi:10.1103/physrevlett.118.102001.
Yang, Yi-Bo, Sufian, Raza Sabbir, Alexandru, Andrei, Draper, Terrence, Glatzmaier, Michael J., Liu, Keh-Fei, & Zhao, Yong. Glue Spin and Helicity in the Proton from Lattice QCD. United States. doi:10.1103/physrevlett.118.102001.
Yang, Yi-Bo, Sufian, Raza Sabbir, Alexandru, Andrei, Draper, Terrence, Glatzmaier, Michael J., Liu, Keh-Fei, and Zhao, Yong. Wed . "Glue Spin and Helicity in the Proton from Lattice QCD". United States. doi:10.1103/physrevlett.118.102001.
@article{osti_1565612,
title = {Glue Spin and Helicity in the Proton from Lattice QCD},
author = {Yang, Yi-Bo and Sufian, Raza Sabbir and Alexandru, Andrei and Draper, Terrence and Glatzmaier, Michael J. and Liu, Keh-Fei and Zhao, Yong},
abstractNote = {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 domain-wall fermion gauge configurations on four lattice spacings and four volumes including an ensemble with physical values for the quark masses. The glue spin SG in the Coulomb gauge in the modified minimal subtraction (¯¯¯¯¯¯MS) scheme is obtained with one-loop perturbative matching. We find the results fairly insensitive to lattice spacing and quark masses. We also find that the proton momentum dependence of SG in the range 0≤|→p|<1.5 GeV is very mild, and we determine it in the large-momentum limit to be SG=0.251(47)(16) at the physical pion mass in the ¯¯¯¯¯¯MS scheme at μ2=10  GeV2. If the matching procedure in large-momentum effective theory is neglected, SG is equal to the glue helicity measured in high-energy scattering experiments.},
doi = {10.1103/physrevlett.118.102001},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 10,
volume = 118,
place = {United States},
year = {2017},
month = {3}
}

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