First lattice QCD study of the gluonic structure of light nuclei
Name
PhysRevD.96.094512.pdf
Size
2.1 MB
Format
Adobe PDF
Checksum (MD5)
fe8947919c750ff32d5d29b9746692e6
Author(s)
Winter, Frank
Gambhir, Arjun S.
Orginos, Kostas
Savage, Martin J.
Shanahan, Phiala E.
Detmold, William
Wagman, Michael L
Date Issued
November 2017
Journal
Physical Review D
Publisher
American Physical Society
Citation
Winter, Frank et al. "First lattice QCD study of the gluonic structure of light nuclei." Physical Review D 96, 9 (November 2017): 094512 © 2017 American Physical Society
Version
Final published version
Abstract
The role of gluons in the structure of the nucleon and light nuclei is investigated using lattice quantum chromodynamics (QCD) calculations. The first moment of the unpolarized gluon distribution is studied in nuclei up to atomic number A=3 at quark masses corresponding to pion masses of m[subscript π]∼450 and 806 MeV. Nuclear modification of this quantity defines a gluonic analogue of the EMC effect and is constrained to be less than ∼10% in these nuclei. This is consistent with expectations from phenomenological quark distributions and the momentum sum rule. In the deuteron, the combination of gluon distributions corresponding to the b[subscript 1]structure function is found to have a small first moment compared with the corresponding momentum fraction. The first moment of the gluon transversity structure function is also investigated in the spin-1 deuteron, where a nonzero signal is observed at m[subscript π]∼806 MeV. This is the first indication of gluon contributions to nuclear structure that can not be associated with an individual nucleon.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.96.094512
