Nature of the $Y(4260)$: A light-quark perspective

Abstract

The $Y(4260)$ has been one of the most puzzling pieces among the so-called $XYZ$ states. In this paper, we try to gain insights into the structure of the $Y(4260)$ from the light-quark perspective. We study the dipion invariant mass spectrum of the $e^{+}{e}^{-}\to Y(4260)\to J/\psi {\pi }^{+}{\pi }^{-}$ process and the ratio of the cross sections $\sigma (e^{+}{e}^{-}\to J/\psi K^{+}{K}^{-})/\sigma (e^{+}{e}^{-}\to J/\psi {\pi }^{+}{\pi }^{-})$. In particular, we consider the effects of different light-quark SU(3) eigenstates inside the $Y(4260)$. The strong pion-pion final-state interactions as well as the $K\bar{K}$ coupled channel in the $S$-wave are taken into account in a model-independent way using dispersion theory. We find that the SU(3) octet state plays a significant role in these transitions, implying that the $Y(4260)$ contains a large light-quark component. Our findings suggest that the $Y(4260)$ is neither a hybrid nor a conventional charmonium state, and they are consistent with the $Y(4260)$ having a sizeable $\bar{D}{D}_1$ component which, however, is not completely dominant.

arXiv comment22 pages, 5 figures

References in corpus (69)

• Hadronic molecules
• The hidden-charm pentaquark and tetraquark states
• Multiquark Resonances
• Non-Standard Heavy Mesons and Baryons, an Experimental Review
• Heavy-Quark QCD Exotica
• Observation of a Broad Structure in the ${\pi }^{+}{\pi }^{-}J/\psi$ Mass Spectrum around 4.26 GeV/$c^2$
• Exotics: Heavy Pentaquarks and Tetraquarks
• The pion-pion scattering amplitude. IV: Improved analysis with once subtracted Roy-like equations up to 1100 MeV
• Exotic Hadrons with Heavy Flavors -X, Y, Z and Related States-
• Higher Charmonia and X,Y,Z states with Screened Potential
• Decoding the riddle of Y(4260) and $Z_c(3900)$
• Hadro-Charmonium
• Precise measurement of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ cross section at center-of-mass energies from 3.77 to 4.60 GeV
• Multiquark States
• Gluonic charmonium resonances at BaBar and Belle?
• A new analysis of $\pi K$ scattering from Roy and Steiner type equations
• Four Quark Interpretation of Y(4260)
• Observation of $e^{+}{e}^{-}\to \gamma X(3872)$ at BESIII
• Are Y(4260) and {\rm Z${}_2^{+}$(4250)} ${\mathrm{D}}_1\mathrm{D}$ or ${\mathrm{D}}_0{\mathrm{D}}^{\ast }$ Hadronic Molecules?
• The Possible Interpretations of Y(4260)
• Evidence of Two Resonant Structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{h}_c$
• Dispersive analysis of the decay eta -> 3 pi
• Bound state nature of the exotic Z_b states
• B_l4 decays and the extraction of |V_ub|
• Regge analysis of the pi pi scattering amplitude
• Production of the X(3872) in charmonia radiative decays
• Final State Interactions and Khuri-Treiman Equations in $\eta \to 3\pi$ decays
• Resonances from meson-meson scattering in U(3) CHPT
• MO analysis of the high statistics Belle results on $\gamma \gamma \to {\pi }^{+}{\pi }^{-},{\pi }^0{\pi }^0$ with chiral constraints
• Comprehensive Amplitude Analysis of $\gamma \gamma \to {\pi }^{+}{\pi }^{-},{\pi }^0{\pi }^0$ and $\overline{K}K$ below 1.5 GeV
• $Y(4260)$ as the first $S$-wave open charm vector molecular state?
• Measurement of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (3686)$ from 4.008 to 4.600$\sim$GeV and observation of a charged structure in the ${\pi }^{\pm }\psi (3686)$ mass spectrum
• Hadronic Decays of the X(3872) to chi_{cJ} in Effective Field Theory
• Determination of spin and parity of the $Z_c(3900)$
• One Explanation for the Exotic State Y(4260)
• The XYZ states revisited
• $Z_c(3900)$: what has been really seen?
• Unified dispersive approach to real and virtual photon-photon scattering at low energy
• Charmonium's K2 peak
• Evidence of a resonant structure in the $e^{+}{e}^{-}\to {\pi }^{+}{D}^0{D}^{\ast -}$ cross section between 4.05 and 4.60 GeV
• Anomalous decay and scattering processes of the eta meson
• Y(4260) and Y(4360) as mixed hadrocharmonium
• Dispersive analysis of the scalar form factor of the nucleon
• Amplitude analysis and the nature of the Zc(3900)
• Measurement of the e+e- --> D0D*-pi+ cross section using initial-state radiation
• A model-independent analysis of final-state interactions in \bar B_{d/s}^0 --> J/psi pi pi
• A New Look at the $Y$ Tetraquarks and ${\Omega }_c$ Baryons in the Diquark Model
• Interplay of quark and meson degrees of freedom in near-threshold states: A practical parametrisation for line shapes
• A new parametrization for the scalar pion form factors
• A practical parametrization for line shapes of near-threshold states
• Two photon couplings of the lightest isoscalars from BELLE data
• Observation of $e^{+}{e}^{-}\to \omega {\chi }_{c1,2}$ near $\sqrt{s}$ = 4.42 and 4.6 GeV
• Spectra and decays of hybrid charmonia
• Bounding effective parameters in the chiral Lagrangian for excited heavy mesons
• On the Nature of X(4260)
• Nonresonant explanation for the Y(4260) structure observed in the $e^{+}{e}^{-}\to J/\psi {\pi }^{+}{\pi }^{-}$ process
• Updated Cross Section Measurement of $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$ and $K_S^0{K}_S^{0}J/\psi$ via Initial State Radiation at Belle
• Investigating possible decay modes of $Y(4260)$ under the $D_1(2420)\bar{D}+c.c$ molecular state ansatz
• Leptonic and Digamma decay Properties of S-wave quarkonia states
• Production of $Y(4260)$ as a hadronic molecule state of $\bar{D}{D}_1+c.c.$ in $e^{+}{e}^{-}$ annihilations
• Effects of $Z_b$ states and bottom meson loops on ${\rm Y}(4S)\to {\rm Y}(1S,2S){\pi }^{+}{\pi }^{-}$ transitions
• Lowest vector tetraquark states: $Y(4260/4220)$ or $Z_c(4100)$
• Line shapes in Υ(5S) \to B^{(*)} \bar{B}^{(*)}πwith Z(10610) and Z(10650) using effective field theory
• Evidence for $Z_c^{\pm }(3900)$ in semi-inclusive decays of $b$-flavored hadrons
• Improving the Hadron Physics of Non-Standard-Model Decays: Example Bounds on R-parity Violation
• Interference effect as resonance killer of newly observed charmoniumlike states $Y(4320)$ and $Y(4390)$
• Observation of $e^{+}{e}^{-}\to K\bar{K}J/\psi$ at center-of-mass energies from 4.189 to 4.600 GeV
• $X(4260)$ Revisited: A Coupled Channel Perspective
• Pion Polarizabilities from $\gamma \gamma \to \pi \pi$ Analysis

Cited by in corpus (17)

• The $XYZ$ states: experimental and theoretical status and perspectives
• Pentaquark and Tetraquark states
• A Review on Partial-wave Dynamics with Chiral Effective Field Theory and Dispersion Relation
• 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
• Data-driven dispersive analysis of the $\pi \pi$ and $\pi K$ scattering
• Prediction of possible $D{K}_1$ bound states
• Precise determination of the pole position of the exotic $Z_c(3900)$
• Are the XYZ states unconventional states or conventional states with unconventional properties?
• Studying the $D_{1}D$ molecule in the Bethe-Salpeter equation approach
• The role of charged exotic states in $e^{+}{e}^{-}\to \psi (2S){\pi }^{+}{\pi }^{-}$
• Simultaneous description of the $e^{+}{e}^{-}\to J/\psi \pi \pi (K\bar{K})$ processes
• Study of the $Y(4660)$ from a light-quark perspective
• Three-body strong decays of the $Y(4230)$ via the light-cone QCD sum rules
• $\varphi (2170)$ decaying to $\varphi \pi \pi$ and $\varphi K\bar{K}$
• Pinpointing Physical Solutions in Y(4230) Decays
• Unified study of $B_s^0\to X(3872){\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$ and $B_s^0\to \psi (2S){\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$ processes