Canonical interpretation of the newly observed $J^P =1^+$ structure $X(2085)$

TL;DR

This paper interprets the newly observed $X(2085)$ as a radially excited $K_1(3P)$ meson using decay behavior analysis within the quark pair creation model, providing predictions for its decay channels and width.

Contribution

It offers a canonical interpretation of $X(2085)$ as a $K_1(3P)$ state and assigns other $K_1$ states within the same framework, advancing understanding of strange axialvector mesons.

Findings

$X(2085)$ is identified as a $K_1(3P)$ state based on decay analysis.

Predicted decay channels include $ ho(1450) K$, $ ho(1420)K$, and others.

The width of the $K_1(3P^ extprime)$ state is about 300 MeV.

Abstract

Inspired by the newly observed $X(2085)$ by the BESIII Collaboration, we study the strong decay behaviors of excited axialvector strange mesons within the quark pair creation model. Our results indicate that the $K_1(1793)/K_1(1861)$ can be regarded as the same $K_1(2P)$ state, and the $K_1(1911)$ is assigned as the $K_1(2P^\prime)$ state. Considering the mass, spin-parity, and decay behaviors, we interpret the newly observed $X(2085)$ as the radially excited $K_1(3P)$ state, which mainly decays into the $\rho(1450) K$, $\omega(1420)K$, $\pi K^*(1410)$, $\rho K_1(1270)$, and $\rho K^*(892)$ final states. Also, the width of $K_1(3P^\prime)$ state is predicted to be about 300 MeV, which can be searched for by future experiments. We expect that present calculations can help us to better understand the nature of the $X(2085)$ structure.