Publications
Publication Information
| Title | Global QCD analysis of pion parton distributions with threshold resummation |
| Authors | Patrick Barry, Chueng Ji, Nobuo Sato, Wolodymyr Melnitchouk |
| JLAB number | JLAB-THY-21-3482 |
| LANL number | arXiv:2108.05822 |
| Other number | DOE/OR/23177-5299 |
| 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 Letters Volume 127 Page(s) 232001 Refereed | |
| Publication Abstract: | We perform the first global QCD analysis of pion valence, sea quark, and gluon distributions within a Bayesian Monte Carlo framework with threshold resummation on Drell-Yan cross sections at next-to-leading log accuracy. Exploring various treatments of resummation, we find that the large-$x$ asymptotics of the valence quark distribution $\sim (1-x)^{\beta_v}$ can differ significantly, with $\beta_v$ ranging from $\approx 1$ to $> 2.5$ at the input scale. Regardless of the specific implementation, however, the resummation induced redistribution of the momentum between valence quarks and gluons boosts the total momentum carried by gluons to $\approx 40\%$, increasing the gluon contribution to the pion mass to $\approx 40$~MeV. |
| Experiment Numbers: | other |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevLett.127.232001 |
| Accepted Manuscript: | PhysRevLett.127.232001.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |