Glue Spin and Helicity in the Proton from Lattice QCD

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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.

Original languageEnglish
Article number102001
JournalPhysical Review Letters
Volume118
Issue number10
DOIs
StatePublished - Mar 6 2017

Bibliographical note

Publisher Copyright:
© 2017 American Physical Society.

ASJC Scopus subject areas

  • General Physics and Astronomy

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