Understanding the newly observed Y(4008) by Belle

Abstract

Very recently a new enhancement around 4.05 GeV was observed by Belle experiment. In this short note, we discuss some possible assignments for this enhancement, i.e. $\psi (3S)$ and $D^{\ast }{\bar{D}}^{\ast }$ molecular state. In these two assignments, Y(4008) can decay into $J/\psi {\pi }^0{\pi }^0$ with comparable branching ratio with that of $Y(4008)\to J/\psi {\pi }^{+}{\pi }^{-}$. Thus one suggests high energy experimentalists to look for Y(4008) in $J/\psi {\pi }^0{\pi }^0$ channel. Furthermore one proposes further experiments to search missing channel $D\bar{D}$, $D{\bar{D}}^{\ast }+h.c.$ and especially ${\chi }_{cJ}{\pi }^{+}{\pi }^{-}{\pi }^0$ and ${\eta }_c{\pi }^{+}{\pi }^{-}{\pi }^0$, which will be helpful to distinguish $\psi (3S)$ and $D^{\ast }{\bar{D}}^{\ast }$ molecular state assignments for this new enhancement.

4 pages, 5 figures. Typos corrected

References in corpus (1)

• Analysis on Heavy Quarkonia Transitions with Pion Emission in Terms of the QCD Multipole Expansion and Determination of Mass Spectra of Hybrids