Publications
Publication Information
Title | Nonperturbatively-renormalized glue momentum fraction at physical pion mass from Lattice QCD |
Authors | YI-Bo Yang, Ming Gong, Jian Liang, Huey-Wen Lin, Kehfei Liu, Dimitra Pefkou, Phiala Shanahan |
JLAB number | JLAB-THY-18-2739 |
LANL number | arXiv:1805.00531 |
Other number | DOE/OR/23177-4465 |
Document Type(s) | (Journal Article) |
Associated with EIC: | No |
Supported by Jefferson Lab LDRD Funding: | No |
Funding Source: | Nuclear Physics (NP) |
Journal Compiled for Physical Review D Volume 98 Issue 07 Page(s) 074506 Refereed | |
Publication Abstract: | We present the first nonperturbatively-renormalized determination of the glue momentum fraction $\langle x \rangle_g$ in the nucleon, based on lattice-QCD simulations at physical pion mass using the cluster-decomposition error reduction (CDER) technique. We provide the first practical strategy to renormalize the glue energy-momentum tensor (EMT) nonperturbatively in the RI/MOM scheme, and convert the results to the $\overline{\textrm{MS}}$ scheme with 1-loop matching. The simulation results show that the CDER technique can reduce the statistical uncertainty of its renormalization constant by a factor of ${\cal O}$(300) in calculations using typical state-of-the-art lattice volume, and the nonperturbatively-renormalized $\langle x \rangle_g$ is shown to be independent of the lattice definitions of the glue EMT up to discretization errors. We determine the renormalized $\langle x \rangle_g^{\overline{\textrm{MS}}}(2\textrm{ GeV})$ to be 0.42(4)(11) at physical pion mass, which is consistent with the experimentally-determined value. |
Experiment Numbers: | |
Group: | THEORY CENTER |
Document: | |
DOI: | https://doi.org/10.1103/PhysRevD.98.074506 |
Accepted Manuscript: | PhysRevD.98.074506.pdf |
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