Gluon gravitational form factors of the nucleon and the pion from lattice QCD
Name
PhysRevD.99.014511.pdf
Size
13.5 MB
Format
Adobe PDF
Checksum (MD5)
56e3e6b823549b9fe18cfc97e7bfb2cf
Author(s)
Shanahan, Phiala E
Detmold, William
Date Issued
January 2019
Journal
Physical Review D
Publisher
American Physical Society
Citation
Shanahan, P. E. and W. Detmold. "Gluon gravitational form factors of the nucleon and the pion from lattice QCD." Physical Review D 99, 1 (January 2019): 014511
Version
Final published version
Abstract
A future electron-ion collider will enable the gluon contributions to the gravitational form factors of the proton to be constrained experimentally for the first time. Here, the first calculation of these form factors from lattice quantum chromodynamics is presented. The calculations use a larger-than-physical value of the light quark mass corresponding to m[subscript π]∼450 MeV. All three form factors, which encode the momentum dependence of the lowest moment of the spin-independent gluon generalized parton distributions and are related to different components of the energy-momentum tensor, are resolved. In particular, the gluon D-term form factor, related to the pressure distribution inside the nucleon, is determined for the first time. The gluon contributions to the two gravitational form factors of the pion are also determined, and are compared to existing lattice determinations of the quark contributions to the gravitational form factors and to phenomenology.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.99.014511
