Publications
Publication Information
| Title | Towards the determination of the gluon helicity distribution in the nucleon from lattice quantum chromodynamics |
| Authors | Robert Edwards, Colin Egerer, Balint Joo, Joseph Karpie, FNU Nikhil Sridharan Karthik, Christopher Monahan, Wayne Morris, Konstantinos Orginos, Anatoly Radyushkin, David Richards, Eloy Romero Alcalde, Raza Sufian, Savvas Zafeiropoulos |
| JLAB number | JLAB-THY-22-3663 |
| LANL number | arXiv:2207.08733 |
| Other number | DOE/OR/23177-5542 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | Yes |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Physical Review C Volume 106 Page(s) 094511 Refereed | |
| Publication Abstract: | We present the first exploratory lattice quantum chromodynamics (QCD) calculation of the polarized gluon Ioffe-time pseudo-distribution in the nucleon. The Ioffe-time pseudo-distribution provides a frame-independent and gauge-invariant framework to determine the gluon helicity in the nucleon from first principles. We employ a high-statistics computation using a $32^3\times 64$ lattice ensemble characterized by a $358$~MeV pion mass and a $0.094$~fm lattice spacing. We establish the pseudo-distribution approach as a feasible method to address the proton spin puzzle with successive improvements in statistical and systematic uncertainties anticipated in the future. Within the statistical precision of our data, we find a good comparison between lattice determined polarized gluon Ioffe-time distribution and the corresponding expectations from the state-of-the-art global analyses. We find a hint for a nonzero gluon spin contribution to the proton spin from the model-independent extraction of the gluon helicity pseudo-distribution over a range of Ioffe-time, $\nu\lesssim 9$. |
| Experiment Numbers: | |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevD.106.094511 |
| Accepted Manuscript: | PhysRevD.106.094511.pdf |
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