Nonresonant explanation for the Y(4260) structure observed in the $e^{+}{e}^{-}\to J/\psi {\pi }^{+}{\pi }^{-}$ process

Abstract

In this work, we proposed a nonresonant explanation for the Y(4260) structure observed in the $e^{+}{e}^{-}\to J/\psi {\pi }^{+}{\pi }^{-}$ process, i.e., Y(4260) is not a genuine resonance. Our result indicates that the Y(4260) structure can be reproduced by the interference of production amplitudes of the $e^{+}{e}^{-}\to J/\psi {\pi }^{+}{\pi }^{-}$ processes via direct $e^{+}{e}^{-}$ annihilation and through intermediate charmonia $\psi (4160)/\psi (4415)$. Besides describing Y(4260) line shape in $e^{+}{e}^{-}\to J/\psi {\pi }^{+}{\pi }^{-}$ well, such a nonresonant explanation for the Y(4260) structure naturally answers why there is no evidence of Y(4260) in the exclusive open-charm decay channel and $R$-value scan.

7 pages, 4 figures, 4 tables. Final version accepted for publication in Physical Review D

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• Chiral Multiplets of Heavy-Light Mesons
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• The hidden-charm pentaquark and tetraquark states
• An overview of $XYZ$ new particles
• Constructing $J/\psi$ family with updated data of charmoniumlike $Y$ states
• Predicted charged charmonium-like structures in the hidden-charm dipion decay of higher charmonia
• On the Nature of X(4260)
• Selected strong decay modes of Y(4260)
• Prediction of a missing higher charmonium around 4.26 GeV in $J/\psi$ family
• 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
• Strong decays of the $XYZ$ states
• Lowest vector tetraquark states: $Y(4260/4220)$ or $Z_c(4100)$
• Vector tetraquark state candidates: $Y(4260/4220)$, $Y(4360/4320)$, $Y(4390)$ and $Y(4660/4630)$
• Unified Fano-like interference picture for charmonium-like states $Y(4008)$, $Y(4260)$ and $Y(4360)$
• Correlation of the hidden-charm molecular tetraquarks and the charmoniumlike structures existing in the $B\to XYZ+K$
• 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
• Status of quarkonia - like negative and positive parity states in a relativistic confinement scheme
• Interference effect as resonance killer of newly observed charmoniumlike states $Y(4320)$ and $Y(4390)$
• $X(4260)$ Revisited: A Coupled Channel Perspective
• 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 $p\bar{p}$
• Charmonium spectrum with a Dirac potential model in the momentum space
• Implication of the observed $\psi (3770)\to p\bar{p}{\pi }^0$ for studying the $p\bar{p}\to \psi (3770){\pi }^0$ process
• Reconciling the X(2240) with the Y(2175)
• A novel explanation of charmonium-like structure in $e^{+}{e}^{-}\to \psi (2S){\pi }^{+}{\pi }^{-}$
• On the origin of the $Y(4260)$
• Production of the charmoniumlike state $Y(4220)$ through the $p\bar{p}\to Y(4220){\pi }^0$ reaction
• Three-body strong decays of the $Y(4230)$ via the light-cone QCD sum rules
• Coupled-channel study of $4S$-$3D$ mixing dynamics in $\psi (4220)$ and $\psi (4380)$
• Study of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\omega$ process at center-of-mass energies between 4.0 and 4.6 GeV
• Ballistic Lévy walk with rests: Escape from a bounded domain