The X(3872) boson: Molecule or charmonium

Abstract

It has been argued that the mystery boson X(3872) is a molecule state consisting of primarily D0-D0*bar + D0bar-D*0. In contrast, apparent puzzles and potential difficulties have been pointed out for the charmonium assignment of X(3872). We examine several aspects of these alternatives by semiquantitative methods since quantitatively accurate results are often hard to reach on them. We find that some of the observed properties of X(3872), in particualr, the binding and the production rates are incompatible with the molecule interpretation. Despite puzzles and obstacles, X(3872) may fit more likely to the excited triplet P_1 charmonium than to the molecule after mixing of cc-bar with DD*-bar +Dbar-D* is taken into account. One simple experimental test is pointed out for distinguishing between a charmonium and an isospin-mixed molecule in the neutral B decay.

A few sentences of comment are added. One minor rewording in the Introduction. Two trivial typos are corrected

References in corpus (15)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Diquark-Antidiquarks with Hidden or Open Charm and the Nature of X(3872)
• Study of the B- --> J/psi K- pi+ pi- Decay and Measurement of the B- --> X(3872) K- Branching Fraction
• Observation of a near-threshold omega-J/psi mass enhancement in exclusive B-->K omega J/psi decays
• Diagnostic Decays of the X(3872)
• Coupled-channel model for charmonium levels and an option for X(3872)
• Reinterpreting several narrow `resonances' as threshold cusps
• Is X(3872) a possible candidate of hybrid meson
• Decays of the X(3872) into J/psi and Light Hadrons
• Factorization in the Production and Decay of the X(3872)
• An Alternative Interpretation of X(3872)
• Angular distributions in $J/\psi (\rho ,\omega )$ states near threshold
• Search for a Charmonium Assignment for the X(3872)
• The X(3872) and the 3941 MeV peak in omega+J/Psi
• Describing non-$q\bar{q}$ candidates

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• Estimate for the X(3872) to gamma J/psi decay width
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• Quarkonium Contribution to Meson Molecules
• Hidden-charm and bottom meson-baryon molecules coupled with five-quark states
• Chromomagnetism, flavour symmetry breaking and S-wave tetraquarks
• The $X(3872)\to J/\psi \gamma$ decay in the $D{\bar{D}}^{\ast }$ molecular picture
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• General considerations on the nature of $Z_b(10610)$ and $Z_b(10650)$ from their pole positions
• Pionic transitions from X(3872) to chi_{cJ}
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• A Refined Analysis on the $X(3872)$ Resonance
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• Are the $X$(4160) and $X$(3915) charmonium states?
• Delicate interplay between the D0-D*0, rho0-J/psi, and omega-J/psi channels in the X(3872) resonance
• Establishing the heavy quark spin and light flavor molecular multiplets of the $X(3872)$, $Z_c(3900)$ and $X(3960)$
• Weakly-bound Hadronic Molecule near a 3-body Threshold
• Finite volume corrections to the binding energy of the X(3872)
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• Observation of sizeable $\omega$ contribution to ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}J/\psi$ decays
• A new group of doubly charmed molecule with $T$-doublet charmed meson pair
• Heavy Exotic Molecules with Charm and Bottom
• Observation of $X(3872)$ in $B\to X(3872)K\pi$ decays
• Comprehending Isospin breaking effects of $X(3872)$ in a Friedrichs-model-like scheme
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• How to identify the structure of near-threshold states from the line shape
• Heavy and Strange Holographic Baryons
• Heavy Holographic Exotics: Tetraquarks as Efimov States
• X(3872) in an unquenched quark model
• Probing the $XYZ$ states through radiative decays
• $T_{cc}^{+}$ and $X(3872)$ with the complex scaling method and $DD(\bar{D})\pi$ three-body effect
• Predicting isovector charmonium-like states from X(3872) properties
• EM Decay of X(3872) as the $1{}^1{D}_2(2^{-+})$ charmonium
• $e^{+}{e}^{-}\to \gamma X(3872)$ near the $D^{\ast }{\bar{D}}^{\ast }$ threshold
• Dimesonic states with the heavy-light flavour mesons
• Triangle singularity appearing as an $X(3872)$-like peak in $B\to (J/\psi {\pi }^{+}{\pi }^{-})K\pi$
• Precision Measurement of the Mass of the $D^{\ast 0}$ Meson and the Binding Energy of the $X(3872)$ Meson as a $D^0\overline{D^{\ast 0}}$ Molecule
• Measurement of branching fractions for B \to J/ψηK decays and search for a narrow resonance in the J/ψηfinal state
• The role of the pion in the lineshape of the $X(3872)$
• X(3872) and Its Heavy Quark Spin Symmetry Partners in QCD Sum Rules
• Two-Body Strong Decay of the 2P and 3P Charmonium states
• Search for B decays to final states with the eta_c meson
• The $c\bar{c}$ interaction above threshold and the radiative decay $X(3872)\to J/\psi \gamma$
• The structure of the X(3872) as explained by a Diffusion Monte Carlo calculation
• The nature of $Z_b$ states from a combined analysis of ${\rm Y}(5S)\to h_b(mP){\pi }^{+}{\pi }^{-}$ and ${\rm Y}(5S)\to B^{(\ast )}{\bar{B}}^{(\ast )}\pi$
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• Spectroscopy of Mesons with Heavy Quarks
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• Probing the nature of the ${\chi }_{c1}(3872)$ state using radiative decays
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• Exotic Hadrons from Scattering in the Diabatic Dynamical Diquark Model
• Radiative decay of the $X(3872)$ as a mixed molecule-charmonium state in effective field theory
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• Decay properties of the $X(3872)$ through the Fierz rearrangement
• Identifying an $\mathrm{X}(3872)$ tetraquark state versus a molecular state by formation time, velocity and temperature in relativistic nuclear collisions
• Electro-weak production of pseudovector C-even heavy quarkonia in electron-positron collisions on Belle II and BES III
• The role of electromagnetic interaction in the $X(3872)$ and its analogs
• Analysis of the possible $D{\bar{D}}_{s0}^{\ast }(2317)$ and $D^{\ast }{\bar{D}}_{s1}^{\ast }(2460)$ molecules with QCD sum rules
• Tetraquarks in the Born-Oppenheimer approximation
• Search for $C=+$ charmonium and XYZ states in $e^{+}{e}^{-}\to \gamma +H$ at BESIII
• Study of the hidden charm $D{\bar{D}}^{\ast }$ interactions in chiral effective field theory
• Role of the short-range dynamics in the formation of $D^{(\ast )}{\bar{D}}^{(\ast )}/B^{(\ast )}{\bar{B}}^{(\ast )}$ hadronic molecules
• Analysis of the vector meson transitions among the heavy quarkonium states
• The MC-QTAIM: A framework for extending the atoms in molecules analysis beyond purely electronic systems
• Study of $e^{+}{e}^{-}\to \omega X(3872)$ and $\gamma X(3872)$ from 4.66 to 4.95 GeV
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• The double life of the X meson
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• 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
• On the origin of the narrow peak and the isospin symmetry breaking of the $X$(3872)
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• Radiative decays of hadronic molecules: From confusion to inspiration
• X, Y and Z States