Exotic resonances due to $\eta$ exchange

Abstract

The meson $X(3872)$ and several related states appear to be, at least in part, hadronic molecules in which a heavy flavored meson (such as $D^0$) is bound to another heavy meson (such as ${\bar{D}}^{\ast 0}$). Although not the only effect contributing to the binding, pion exchange seems to play a crucial role in generating the longest-range force between constituents. Mesons without $u$ and $d$ light quarks (such as $D_s$) cannot exchange pions, but under suitable circumstances can bind as a result of $\eta$ exchange. Channels in which this mechanism is possible are identified, and suggestions are made for searches for the corresponding molecular states, including a manifestly exotic baryonic ${\Lambda }_c{\bar{D}}_s^{\ast }$ resonance decaying into $J/\psi \Lambda$.

6 pages, 1 figure

References in corpus (10)

• Big-Bang Nucleosynthesis
• Evidence for a Narrow Near-Threshold Structure in the $J/\psi \varphi$ Mass Spectrum in $B^{+}\to J/\psi \varphi K^{+}$ Decays
• Pion Interactions in the X(3872)
• The Heavy Quark Spin Symmetry Partners of the X(3872)
• Is X(3872) a molecule?
• Effects of S-wave thresholds
• Possible Molecular States of $D_s^{\ast }{\bar{D}}_s^{\ast }$ System and Y(4140)
• Study of B{+-,0} --> J/ψ K+ K- K{+-,0} and search for B0 --> J/ψ ϕ at BABAR
• $X(3915)$ as a $D_s{\bar{D}}_s$ bound state
• Mass of \emph{Y}(4140) in Bethe-Salpeter equation for quarks

Cited by in corpus (33)

• Non-Standard Heavy Mesons and Baryons, an Experimental Review
• Exotics: Heavy Pentaquarks and Tetraquarks
• Multiquark States
• Observation of $J/\psi \varphi$ structures consistent with exotic states from amplitude analysis of $B^{+}\to J/\psi \varphi K^{+}$ decays
• $QQ\bar{Q}\bar{Q}$ states: masses, production, and decays
• Amplitude analysis of $B^{+}\to J/\psi \varphi K^{+}$ decays
• Possible strange hidden-charm pentaquarks from ${\Sigma }_c^{(\ast )}{\bar{D}}_s^{\ast }$ and ${\Xi }_c^{{(}^{\prime },\ast )}{\bar{D}}^{\ast }$ interactions
• The $X(4140)$, $X(4274)$, $X(4500)$ and $X(4700)$ in the relativized quark model
• Heavy molecules and one-$\sigma /\omega$-exchange model
• Tetraquarks in large-$N_c$ QCD
• Strange hadrocharmonium
• Observation of a vector charmoniumlike state in $e^{+}{e}^{-}\to D_s^{+}{D}_{s1}(2536{)}^{-}+c.c.$
• Spin-parities of the $P_c(4440)$ and $P_c(4457)$ in the One-Boson-Exchange Model
• Analysis of the $B^{+}\to J/\psi \varphi K^{+}$ data at low $J/\psi \varphi$ invariant masses and the $X(4140)$ and $X(4160)$ resonances
• Light Quark Spin Symmetry in $Z_b$ Resonances?
• Canonical interpretation of the $X(4140)$ state within the ${}^3{P}_0$ model
• Understanding the $0^{++}$ and $2^{++}$ charmonium(-like) states near 3.9 GeV
• Can the state $Y(4626)$ be a $P$-wave tetraquark state $[cs][\bar{c}\bar{s}]$?
• Y(4626) as a molecular state from interaction $D_s^{\ast }{\bar{D}}_{s1}(2536)-D_s{\bar{D}}_{s1}(2536)$
• Threshold effects as the origin of $Z_{cs}(4000)$, $Z_{cs}(4220)$ and $X(4700)$ observed in $B^{+}\to J/\psi \varphi K^{+}$
• Are there narrow flavor-exotic tetraquarks in large-$N_c$ QCD?
• Reanalysis of the $X(4140)$ as axialvector tetraquark state with QCD sum rules
• Mass-Spectroscopy of hidden charm and hidden strange tetraquarks in diquark-antidiquark approach
• On tetraquarks with hidden charm and strangeness as phi-psi(2S) hadrocharmonium
• Disclosing $D^{\ast }{\bar{D}}^{\ast }$ molecular states in the $B_c^{-}\to {\pi }^{-}J/\psi \omega$ decay
• Study of $e^{+}{e}^{-}\to \gamma \varphi J/\psi$ from $\sqrt{s}=4.600$ to $4.951$ GeV
• Semileptonic decay of $B_c^{-}$ into $X(3930)$, $X(3940)$, $X(4160)$
• Some properties of the states at the hidden-strangeness mixed ${\frac{1}{2}}^{+}+{\frac{1}{2}}^{-}$ heavy meson pair threshold in $e^{+}{e}^{-}$ annihilation
• Exotic Hadrons in the ${\Lambda }_b\to J/\psi \varphi \Lambda$ Decay
• Production of $X_{cs\bar{c}\bar{s}}$ in heavy ion collisions
• Quark spin structures of bottom-charmed threshold molecular states
• Partial waves in $B_s^{\ast }{\bar{B}}_s^{\ast }$ production in $e^{+}{e}^{-}$ annihilation near threshold
• Decoding the near-threshold $X_{0,1}(4140)$ and $X_1(4685)$ states via OZI-suppressed coupled-channel scattering