Investigations on the charmless decays of $Y(4260)$

TL;DR

This paper investigates the charmless decay channels of the $Y(4260)$ particle, proposing a molecular structure model and predicting decay branching ratios that can be tested with future experimental data.

Contribution

It introduces a novel approach to study $Y(4260)$ via charmless decays using meson loop mechanisms under the molecule hypothesis.

Findings

Predicted total branching ratios for $Y(4260) o VP$ decays are around 0.34% to 0.75%.

Intermediate $D_1 ar D + c.c.$ meson loops are likely transition mechanisms.

Predicted decay rates are comparable to $Y(4260) o Z_c^+(3900) o ext{final states}$.

Abstract

Apart from the charmful decay channels of $Y(4260)$, the charmless decay channels of $Y(4260)$ also provide us a good platform to study the nature and the decay mechanism of $Y(4260)$. In this paper, we propose to probe the structure of $Y(4260)$ through the charmless decays $Y(4260)\to VP$ via intermediate $D_1\bar D+c.c.$ meson loops, where $V$ and $P$ stand for light vector and pseudoscalar mesons, respectively. Under the molecule ansatz of $Y(4260)$, the predicted total branching ratio $BR_{VP}$ for all $Y(4260)\to VP$ processes are about $(0.34^{+0.32}_{-0.23})%$ to $(0.75^{+0.72}_{-0.52})%$ with the cutoff parameter $\alpha=2\sim 3$. Numerical results show that the intermediate $D_1 \bar D+c.c.$ meson loops may be a possible transition mechanism in the $Y(4260)\to VP$ decays. These predicted branching ratios are the same order to that of $Y(4260) \to Z_c^+(3900) \pi^-$, which may be an evidence of $D_1D$ molecule and can be examined by the forthcoming BESIII data in the near future.