Two charged strangeonium-like structures observable in the $Y(2175) \to \phi(1020)\pi^{+} \pi^{-}$ process

TL;DR

This paper predicts two charged strangeonium-like structures near specific thresholds in the $Y(2175)$ decay process using the ISPE mechanism, encouraging experimental searches at Belle II, Super-B, and BESIII.

Contribution

It introduces the prediction of two charged strangeonium-like structures in the $Y(2175)$ decay process using the ISPE mechanism, which has not been previously reported.

Findings

Prediction of a sharp peak ($Z_{s1}^+$) near the $Kar{K}^*$ threshold.

Prediction of a broad structure ($Z_{s2}^+$) near the $K^*ar{K}^*$ threshold.

Identification of a sharp peak in the $ o ext{phi}(1020) ext{pi}^+$ spectrum in the $ ext{phi}(1680)$ decay.

Abstract

Via the Initial Single Pion Emission (ISPE) mechanism, we study the $\phi(1020)\pi^{+}$ invariant mass spectrum distribution of $Y(2175) \to \phi(1020)\pi^{+} \pi^{-}$. Our calculation indicates there exist a sharp peak structure ($Z_{s1}^+$) close to the $K\bar{K}^\ast$ threshold and a broad structure ($Z_{s2}^+$) near the $K^\ast\bar{K}^\ast$ threshold. In addition, we also investigate the $\phi(1680) \to \phi(1020)\pi^{+} \pi^{-}$ process due to the ISPE mechanism, where a sharp peak around the $K\bar{K}^\ast$ threshold appears in the $\phi(1020)\pi^{+}$ invariant mass spectrum distribution. We suggest to carry out the search for these charged strangeonium-like structures in future experiment, especially Belle II, Super-B and BESIII.