Speaker
Description
I will present a theoretical and experimental overview of the production of eta-pi and eta’-pi with pion beam (COMPASS) and photon beam (GlueX).
These two-meson systems are known to have odd angular waves with exotic quantum numbers.
The JPAC collaboration has been analyzing the COMPASS and GlueX data in order to extract the properties of the lightest exotic meson, the pi_1(1600). In this talk, I will review the main features and present the plan for future work.
This talk will be based on the following publications:
A.~Jackura et al. [JPAC and COMPASS],
``New analysis of eta pi tensor resonances measured at the COMPASS experiment,'' Phys. Lett. B 779 (2018), 464-472
A.~Rodas et al. [JPAC],
``Determination of the pole position of the lightest hybrid meson candidate,''
Phys. Rev. Lett. 122 (2019) 042002
L.~Bibrzycki et al. [JPAC],
``pi^-p --> eta', pi^- p in the double-Regge region''
Eur. Phys. J. C 81 (2021), 647
[erratum: Eur. Phys. J. C 81 (2021) 915]
G.~Montaña et al.
``High-energy $η^{(\prime)}π$ photoproduction and the nature of exotic waves,''
preprint [arXiv:2510.14549 [hep-ph]].