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arXiv · 2203.04327

The phenomenology of the exotic hybrid nonet with $π_1(1600)$ and $η_1(1855)$

Vanamali Shastry·Christian S. Fischer·Francesco Giacosa
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Abstract

We study the decays of the $J^{PC}=1^{-+}$ hybrid nonet using a Lagrangian invariant under the flavor symmetry, parity reversal, and charge conjugation. We use the available experimental data, the lattice predictions, and the flavor constraints to evaluate the coupling strengths of the $π_1(1600)$ to various two-body mesonic states. Using these coupling constants, we estimate the partial widths of the two-body decays of the hybrid pion, kaon and the isoscalars. We find that the hybrid kaon can be nearly as broad as the $π_1(1600)$. Quite remarkably, we find also that the light isoscalar must be significantly narrow while the width of the heavy isoscalar can be matched to the recently observed $η_1(1855)$.

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Vanamali Shastry, Christian S. Fischer, Francesco Giacosa. 2022-07-28. The phenomenology of the exotic hybrid nonet with $π_1(1600)$ and $η_1(1855)$. https://doi.org/10.1016/j.physletb.2022.137478

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