Phenomenological model for the $\gamma^*\gamma \to \eta \pi^+ \pi^-$ reaction in the $f_1(1285)$ energy region

Autor:	Ren, Xiu-Lei, Danilkin, Igor, Vanderhaeghen, Marc
Rok vydání:	2024
Předmět:	High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory
Druh dokumentu:	Working Paper
Popis:	Motivated by the ongoing analysis by the BESIII Collaboration on the single-tagged $e^+e^-\to e^+e^- \eta \pi^+\pi^-$ reaction, we present a phenomenological study of the diphoton fusion to $\eta \pi^+ \pi^-$, focusing on the production mechanism of the $f_1(1285)$ resonance. Contributions from the $f_1(1285)\to a_0(980)^\pm\, \pi^\mp$ and $f_1(1285)\to \sigma/f_0(500)\, \eta$ channels are included without introducing free parameters within an effective Lagrangian approach. Assuming the destructive interference between the amplitudes, we predict the invariant mass distributions, angular distributions, and total cross sections of the $\gamma^*\gamma \to \eta\pi^+\pi^-$ process, which will be tested by the forthcoming BESIII measurements. Comment: 10 pages, 6 figures, 1 table, version to appear in Phys. Rev. D
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2409.07235 Zobrazit plný text záznamu View this record from Arxiv