Charged pions asymmetry due to interference from the decay of light neutral axial mesons

• Published in: Journal of physics. G, Nuclear and particle physics Nuclear and particle physics, 2024-12, Vol.52 (1)
• Main Author: Braghin, Fabio L
• Format: Article
• Language: English
• Subjects: chiral symmetry breaking; CP breaking; meson mixing; meson structure; particle production; three meson interactions; vacuum polarization
• ISSN: 0954-3899; 1361-6471
• DOI: 10.1088/1361-6471/ad91d0

Effective three meson couplings, based in flavor U(3) quark-antiquark interactions, are considered to describe two light neutral axial meson Strong decays, $A \sim f_1(1285)$ and $f_{1S} (1420)$, and the charged rho meson decay in the following channels: $A \to \rho^\mp (770)+ \pi^\pm$, $A\to a_0^\mp (980) +\pi^\pm$ and $\rho^\pm \to \pi^\pm \pi^0$. By considering neutral meson mixings, such as $f_1(1285) - a_1^0(1260)$, $f_{1S}(1420) - a_1^0(1260)$ and $\eta-\pi^0$ for the channels investigated, the leading three-meson interactions may lead to decay amplitudes that undergo interference and a resulting ratio of decay rate into charged pions, $\Gamma_{\pi^+}/\Gamma_{\pi^-}$, slightly smaller than one. For that it will be assumed that the produced charged vector mesons or charged scalar mesons undergo absorption, decay into channels without charged pions, or any other inelastic process that may suppress their decays into charged pions.