Emergence of new heavy quarkoniumlike states: $Y(10600)$ and $Y(10650)$

TL;DR

This paper predicts two new bottomoniumlike states, $Y(10600)$ and $Y(10650)$, as P-wave $B^{(*)}ar{B}^{(*)}$ bound states or resonances, and suggests their experimental detection would reveal exotic hadron phenomena.

Contribution

It introduces the prediction of two novel heavy quarkoniumlike states as P-wave bottomoniumlike bound states or resonances near thresholds, expanding the understanding of exotic hadrons.

Findings

Predicted masses of $Y(10600)$ and $Y(10650)$ near thresholds.

Line shapes in $e^+e^-$ processes show pronounced peaks.

Existing BelleII data indicate possible signals of $Y(10650)$.

Abstract

We predict the existence of two novel bottomoniumlike states, $Y(10600)$ and $Y(10650)$, as either the $P$-wave $B^{(*)}\bar{B}^{(*)}$ bound state or resonance close to the $B\bar{B}^{*}$ and $B^{*}\bar{B}^{*}$ thresholds, respectively, which are dynamically generated in a coupled-channel framework and have quantum numbers $I(J^{PC})=0(1^{--})$. The first one $Y(10600)$ is identified as the hidden-bottom partner of the recently established charmoniumlike state $G(3900)$, the first candidate of P-wave dimeson resonance in the heavy flavor sector associated with the $D\bar{D}^*/\bar{D}D^*$ scattering dynamics. We predict the line shapes of both $Y(10600)$ and $Y(10650)$ in the cross sections of open bottom processes $e^+e^- \to B\bar{B}^*$ and $e^+e^- \to B^*\bar{B}^*$, both of which exhibit a pronounced peak line shape, and we find that existing experimental data from BelleII show obvious indications of $Y(10650)$. These two new states closely mirror the behavior of $G(3900)$, as their predicted masses lie between the well-known $\Upsilon(4S)$ and $\Upsilon(5S)$, suggesting a manifestly exotic nature once they can be observed by the experiment. Therefore, the experimental search for these new bottomoniumlike states would provide critical evidence for a new class of exotic hadrons of the $P$-wave dimeson and would offer decisive insight into the $XYZ$ spectroscopy.