Publications
Publication Information
| Title | Determination of the pole position of the lightest hybrid meson candidate |
| Authors | Arkaitz Rodas, Alessandro Pilloni, Miguel Albaladejo, CESAR FERNANDEZ RAMIREZ, Andrew Jackura, Vincent Mathieu, Mikhail Mikhasenko, Jannes Nys, Vladiszlav Pauk, Bernhard Ketzer, Adam Szczepaniak |
| JLAB number | JLAB-THY-18-2839 |
| LANL number | arXiv:1810.04171 |
| Other number | DOE/OR/23177-4566 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
| Other Funding: | DE-FG02-87ER40365 PHY-1415459 FPA2016-75654-C2-2-P |
|
Journal Compiled for Physical Review Letters Volume 122 Issue 04 Page(s) 042002 Refereed | |
| Publication Abstract: | Mapping states with explicit gluonic degrees of freedom in the light sector is a challenge, and has led to controversies in the past. In particular, the experiments have reported two different hybrid candidates with spin-exotic signature, pi1(1400) and pi1(1600), which couple separately to eta pi and eta' pi. This picture is not compatible with recent Lattice QCD estimates for hybrid states, nor with most phenomenological models. We consider the recent partial wave analysis of the eta(') pi system by the COMPASS collaboration. We fit the extracted intensitites and phases with a coupled-channel amplitude which enforces the unitarity and analyticity of the S-matrix. We provide a robust extraction of a single exotic pi1 resonant pole, with mass and width 1564 +- 24 +- 86 MeV and 492 +- 54 +- 102 MeV, which couples to both eta(') pi channels. We find no evidence for a second exotic state. We also provide the resonance parameters of the a2(1320) and a2'(1700). |
| Experiment Numbers: | |
| Group: | THEORY CENTER |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevLett.122.042002 |
| Accepted Manuscript: | PhysRevLett.122.042002.pdf |
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