Charmonium's K2 peak

Abstract

The newly reported Y(4260) becomes the second most massive state in the charmonium family. We argue that it displaces the psi(4415) as the (largely) 4s vector charmonium state, recall s-d wave interference to explain the lack of a signal in e-e+ to hadrons and suggest some further study avenues that can exclude exotic meson assignments. The absence of a J/psi KK mode can be understood, beyond phase space suppression, to be a consequence of chiral symmetry. We also provide a model calculation in this sector showing that, although forcing the fit somewhat (which suggests a small sea quark wavefunction component), the state can be incorporated in a standard scheme.

4 pages, 2 figures added

Cited by in corpus (64)

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• Charmonium
• New Charmonium States in QCD Sum Rules: a Concise Review
• Exotic Hadrons with Heavy Flavors -X, Y, Z and Related States-
• Higher Charmonia and X,Y,Z states with Screened Potential
• Quarkonia and their transitions
• Charmonium Decays of $Y(4260), psi(4160), and psi(4040)
• Are Y(4260) and {\rm Z${}_2^{+}$(4250)} ${\mathrm{D}}_1\mathrm{D}$ or ${\mathrm{D}}_0{\mathrm{D}}^{\ast }$ Hadronic Molecules?
• An overview of $XYZ$ new particles
• Potential model calculations and predictions for heavy quarkonium
• New Hadron States
• Observation of Y(2175) in $J/\psi \to \eta \varphi f_0(980)$
• $Y(4260)$ as the first $S$-wave open charm vector molecular state?
• One Explanation for the Exotic State Y(4260)
• Effects of S-wave thresholds
• The Y(4260) as a $J/\psi K\bar{K}$ system
• The Y(4260) as an omega chi_{c1} molecular state
• A Uniform Description of the States Recently Observed at B-factories
• Determining the upper limit of Gamma_{ee} for the Y(4260)
• Searching for the Bottom Counterparts of X(3872) and Y(4260) via ${\pi }^{+}{\pi }^{-}{\rm Y}$
• Nonresonant explanation for the Y(4260) structure observed in the $e^{+}{e}^{-}\to J/\psi {\pi }^{+}{\pi }^{-}$ process
• Hadron Spectroscopy: Theory and Experiment
• The bound state problem of S-wave heavy quark meson-aitimeson systems
• Selected strong decay modes of Y(4260)
• Weak productions of new charmonium in semi-leptonic decays of B_c
• Investigating possible decay modes of $Y(4260)$ under the $D_1(2420)\bar{D}+c.c$ molecular state ansatz
• Production of $Y(4260)$ as a hadronic molecule state of $\bar{D}{D}_1+c.c.$ in $e^{+}{e}^{-}$ annihilations
• Study of J/Psi decays into eta Kstar Kstar-bar
• Strong decays of the $XYZ$ states
• The $P$-wave $[cs][\bar{c}\bar{s}]$ tetraquark state: Y(4260) or Y(4660)?
• Gluonic excitation of non-exotic hybrid charmonium from lattice QCD
• Exotic $1^{--}$ States in QCD Sum Rules
• Nature of the $Y(4260)$: A light-quark perspective
• Prediction of an exotic state around 4240 MeV with $J^{PC}=1^{-+}$ as C-parity partner of Y(4260) in molecular picture
• Heavy-hadron molecular spectrum from light-meson exchange saturation
• Status of quarkonia - like negative and positive parity states in a relativistic confinement scheme
• Interference effects in the X(4260) signal
• A very broad X(4260) and the resonance parameters of the 3D vector charmonium state
• $X(4260)$ Revisited: A Coupled Channel Perspective
• Cross section line shape of $e^{+}{e}^{-}\to {\chi }_{c0}\omega$ around the $Y(4260)$ mass region
• Baryonium Study in Heavy Baryon Chiral Perturbation Theory
• Long-distance behavior of the quark-antiquark static potential. Application to light-quark mesons and heavy quarkonia
• Review of Heavy Hadron Spectroscopy
• Probing the nature of $Y(4260)$ and $Z_c(3900)$ in the isospin violating process $Y(4260)\to J/\psi \eta {\pi }^0$
• Heavy Quark Spectroscopy -- Theory Overview
• Towers of hybrid mesons
• Precise Measurement of Born Cross Sections for $e^{+}{e}^{-}\to D\bar{D}$ at $\sqrt{s}=3.80-4.95$ GeV
• Measurements of $e^{+}{e}^{-}\to K_S^0{K}^{\pm }{\pi }^{\mp }{\pi }^0$ and $K_S^0{K}^{\pm }{\pi }^{\mp }\eta$ at center-of-mass energies from $3.90$ to $4.60\mathrm{GeV}$
• Measurements of the branching fractions of ${\eta }_c\to K^{+}{K}^{-}{\pi }^0$, $K_S^0{K}^{\pm }{\pi }^{\mp }$,$2({\pi }^{+}{\pi }^{-}{\pi }^0)$, and $p\bar{p}$
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• Colloquium: Hadron Production in Open-charm Meson Pair at $e^{+}{e}^{-}$ Collider
• Coupled-Channel-Induced $S-D$ mixing of Charmonia and Testing Possible Assignments for $Y(4260)$ and $Y(4360)$
• Mass spectrum of $1^{--}$ heavy quarkonium
• On leptonic width of $X(4260)$
• Production of the charmoniumlike state $Y(4220)$ through the $p\bar{p}\to Y(4220){\pi }^0$ reaction
• Heavy Hadron Spectroscopy
• $B^{(\ast )}{\bar{B}}^{(\ast )}$ intermediate state contribution to ${\rm Y}(4S,5S)\to {\eta }_b+\gamma$ radiative decay
• Tetraquark molecular states in the $D_s{\bar{D}}_{s1}$ and $D_s^{\ast }{\bar{D}}_{s0}^{\ast }$ mass spectrum
• New charmonium-like states
• New charm resonances
• Pinpointing Physical Solutions in Y(4230) Decays