Publications
Publication Information
| Title | Global QCD Analysis and Dark Photons |
| Authors | N. Hunt-Smith, W. Melnitchouk, N. Sato, A. Thomas, X. Wang, M. J. White |
| JLAB number | JLAB-THY-23-3746 |
| LANL number | arXiv:2302.11126 |
| Other number | DOE/OR/23177-5694 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | Yes |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Journal of High Energy Physics Page(s) 96 Refereed | |
| Publication Abstract: | We perform a global QCD analysis of high energy scattering data within the JAM Monte Carlo framework, including a coupling to a dark photon that augments the standard model electroweak coupling via kinetic mixing with the $Z$ boson. We find a significant reduction in $\chi^2$ favoring the inclusion of a dark photon, with a statistical significance in excess of 7$\sigma$, while the resulting parton distribution functions are consistent with previous global analyses within uncertainties. The modifications to the theoretical predictions are spread across a wide range of $x$ and $Q^2$, with the largest improvement corresponding to neutral current data from HERA. The best fit gives a dark photon mass in the range 3--4~GeV, and upwards of 0.1 for the mixing parameter, $\epsilon$. |
| Experiment Numbers: | other |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1007/JHEP09(2023)096 |
| Accepted Manuscript: | JHEP09(2023)096.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |