TY - JOUR
T1 - Glue Spin and Helicity in the Proton from Lattice QCD
AU - Yang, Yi Bo
AU - Sufian, Raza Sabbir
AU - Alexandru, Andrei
AU - Draper, Terrence
AU - Glatzmaier, Michael J.
AU - Liu, Keh Fei
AU - Zhao, Yong
N1 - Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/3/6
Y1 - 2017/3/6
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.118.102001
DO - 10.1103/PhysRevLett.118.102001
M3 - Article
C2 - 28339233
AN - SCOPUS:85015039641
SN - 0031-9007
VL - 118
JO - Physical Review Letters
JF - Physical Review Letters
IS - 10
M1 - 102001
ER -