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

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Cited by in corpus (14)

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• New Charmonium States in QCD Sum Rules: a Concise Review
• The Exotic XYZ Charmonium-like Mesons
• The possible hidden-charm molecular baryons composed of anti-charmed meson and charmed baryon
• An overview of $XYZ$ new particles
• Possible Deuteron-like Molecular States Composed of Heavy Baryons
• Long-distant contribution and ${\chi }_{c1}$ radiative decays to light vector meson
• Status of quarkonia - like negative and positive parity states in a relativistic confinement scheme
• Study on the rare decays of $Y(4630)$ induced by final state interactions
• Bound States of the Heavy Flavor Vector Mesons and Y(4008) and $Z_1^{+}(4050)$
• Hidden-charm decays of $X(3915)$ and $Z(3930)$ as the P-wave charmonia
• Can the $\psi (4040)$ explain the peak associated with $Y(4008)$?
• Is $Y(4008)$ possibly a $1^{--}$ $\psi (3^3{S}_1)$ state?
• Production of the charmoniumlike state $Y(4220)$ through the $p\bar{p}\to Y(4220){\pi }^0$ reaction