Study of $e^{+}{e}^{-}\to \gamma \omega J/\psi$ and Observation of $X(3872)\to \omega J/\psi$

Abstract

We study the $e^{+}{e}^{-}\to \gamma \omega J/\psi$ process using $11.6\mathrm{f}{\mathrm{b}}^{-1}$ $e^{+}{e}^{-}$ annihilation data taken at center-of-mass energies from $\sqrt{s}=4.008\mathrm{GeV}$ to $4.600\mathrm{GeV}$ with the BESIII detector at the BEPCII storage ring. The $X(3872)$ resonance is observed for the first time in the $\omega J/\psi$ system with a significance of more than $5\sigma$. The relative decay ratio of $X(3872)\to \omega J/\psi$ and ${\pi }^{+}{\pi }^{-}J/\psi$ is measured to be $\mathcal{R}=1.6_{-0.3}^{+0.4}\pm 0.2$, where the first error is statistical and the second systematic (the same hereafter). The $\sqrt{s}$-dependent cross section of $e^{+}{e}^{-}\to \gamma X(3872)$ is also measured and investigated, and it can be described by a single Breit-Wigner resonance, referred to as the $Y(4200)$, with a mass of $4200.6_{-13.3}^{+7.9}\pm 3.0\mathrm{MeV}/c^2$ and a width of $115_{-26}^{+38}\pm 12\mathrm{MeV}$. In addition, to describe the $\omega J/\psi$ mass distribution above $3.9GeV/{\mathrm{c}}^2$, we need at least one additional Breit-Wigner resonance, labeled as $X(3915)$, in the fit. The mass and width of the $X(3915)$ are measured to be $3926.4\pm 2.2\pm 1.2MeV/{\mathrm{c}}^2$ and $3.8\pm 7.5\pm 2.6\mathrm{MeV}$, or $3932.6\pm 8.7\pm 4.7MeV/{\mathrm{c}}^2$ and $59.7\pm 15.5\pm 3.7\mathrm{MeV}$, respectively, depending on the fit models. The resonant parameters of the $X(3915)$ agree with those of the $Y(3940)$ in $B\to K\omega J/\psi$ and of the $X(3915)$ in $\gamma \gamma \to \omega J/\psi$ by the Belle and BABAR experiments within errors.

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• Hadronic molecules
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• Study of the B- --> J/psi K- pi+ pi- Decay and Measurement of the B- --> X(3872) K- Branching Fraction
• Short Range Structure in the X(3872)
• Determination of the X(3872) meson quantum numbers
• Observation of the Charged Hadron $Z_c^{\pm }(3900)$ and Evidence for the Neutral $Z_c^0(3900)$ in $e^{+}{e}^{-}\to \pi \pi J/\psi$ at $\sqrt{s}=4170$ MeV
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• Observation of X(3872) production in pp collisions at sqrt(s)= 7 TeV
• Observation of Y(3940) -> J/psi omega in B -> J/psi omega K at BABAR
• Precision measurement of the integrated luminosity of the data taken by BESIII at center of mass energies between 3.810 GeV and 4.600 GeV
• Branching fraction measurements of χ_{c0} and χ_{c2} to π^0π^0 and ηη
• Observation of a charmonium-like enhancement in the gamma gamma --> omega J/psi process
• Production of the X(3872) in charmonia radiative decays
• Study of $e^{+}{e}^{-}\to \omega {\chi }_{cJ}$ at center-of-mass energies from 4.21 to 4.42 GeV
• Measurement of the Dipion Mass Spectrum in X(3872) -> J/Psi Pi+ Pi- Decays
• Study of X(3915) --> J/ψω in two-photon collisions
• Measurement of the center-of-mass energies at BESIII via the di-muon process
• ${\chi }_{c0}^{}(3915)$ As the Lightest $c\bar{c}s\bar{s}$ State
• Observation of an alternative ${\chi }_{c0}(2P)$ candidate in $e^{+}{e}^{-}\to J/\psi D\bar{D}$
• Cross section measurements of $e^{+}{e}^{-}\to \omega {\chi }_{c0}$ from $\sqrt{s}=$4.178 to 4.278 GeV
• Systematic studies of charmonium-, bottomonium-, and $B_c$-like tetraquark states
• $X(3915)$ as a $D_s{\bar{D}}_s$ bound state

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• Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV
• Hadronic molecules in B decays
• Observation of the $Y(4230)$ and a new structure in $e^{+}{e}^{-}\to K^{+}{K}^{-}J/\psi$
• Study of open-charm decays and radiative transitions of the X(3872)
• A Phenomenological analysis on isospin-violating decay of $X(3872)$
• Measurements of the center-of-mass energies of $e^{+}{e}^{-}$ collisions at BESIII
• Determination of the absolute branching fractions of X(3872) decays
• Revisit the isospin violating decays of $X(3872)$
• Charmonium and Charmoniumlike States at the BESIII Experiment
• Charm-meson Triangle Singularity in $e^{+}{e}^{-}$ Annihilation into $D^{\ast 0}{\bar{D}}^0+\gamma$
• Observation of resonance structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\psi }_2(3823)$ and mass measurement of ${\psi }_2(3823)$
• Triangle Singularity in the Production of $X(3872)$ and a Photon in $e^{+}{e}^{-}$ Annihilation
• Observation of sizeable $\omega$ contribution to ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}J/\psi$ decays
• Triangle singularity appearing as an $X(3872)$-like peak in $B\to (J/\psi {\pi }^{+}{\pi }^{-})K\pi$
• Study of the lineshape of $X(3872)$ using $B$ decays to $D^0\overline{D}{}^{\ast 0}K$
• Triangle relations for XYZ states
• Decays of $X(3872)$ to ${\chi }_{cJ}{\pi }^0$ and $J/\psi {\pi }^{+}{\pi }^{-}$
• The structure of the X(3872) as explained by a Diffusion Monte Carlo calculation
• Predicted $\Lambda \bar{\Lambda }$ and ${\Xi }^{-}{\bar{\Xi }}^{+}$ decay modes of the charmoniumlike $Y(4230)$
• Production of $X(3872)$ and a Photon in $e^{+}{e}^{-}$ Annihilation
• Tetraquark Masses by using extension of Gursey-Radicati Mass Formula
• Dispersive analysis of the isospin breaking in the $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}$ and $X(3872)\to J/\psi {\pi }^{+}{\pi }^0{\pi }^{-}$ decays
• Decay properties of the $X(3872)$ through the Fierz rearrangement
• Radiative Transitions of Charmoniumlike Exotics in the Dynamical Diquark Model
• Search for the decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}{\chi }_{c1}$
• Search for $X(3872)\to {\pi }^0{\chi }_{c0}$ and $X(3872)\to \pi \pi {\chi }_{c0}$ at BESIII
• Constraining the $DD{D}^{\ast }$ three-body bound state via the $Z_c(3900)$ pole
• Study of $e^{+}{e}^{-}\to \omega X(3872)$ and $\gamma X(3872)$ from 4.66 to 4.95 GeV
• Novel correlated $D^0\overline{D}{}^0$ systems for $c/b$ physics and tests of $T/CPT$
• Hidden-Charm Tetraquarks in a Mixture Model: Coupled-Channel Analysis with $c\bar{c}$ and Hadronic Molecular Components
• Search for the radiative transition ${\chi }_{c1}(3872)\to \gamma {\psi }_2(3823)$
• Discovery potential of charmonium $2P$ states through the $e^{+}{e}^{-}\to \gamma D\bar{D}$ processes
• Study of $e^{+}{e}^{-}\to {\pi }^{0}X(3872)\gamma$ and search for $Z_c(4020{)}^0\to X(3872)\gamma$
• Experimental summary: QCD session of the 54th Rencontres de Moriond (Moriond QCD 2019)
• Measurement of $e^{+}{e}^{-}\to \varphi {\eta }^{\prime }$ cross sections at center-of-mass energies between 3.508 and 4.600 GeV
• The $X(3872)\to J/\psi \pi \gamma$ and $X(3872)\to J/\psi \pi \pi \gamma$ decays
• Search for the light hadron decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}\eta$
• Cross section measurement of $e^{+}{e}^{-}\to \eta \psi (2S)$ and search for $e^{+}{e}^{-}\to \eta \tilde{X}(3872)$
• Study of ${\chi }_{bJ}(2P)\to \omega {\rm Y}(1S)$ at Belle
• Constrain the ${\chi }_{cJ}\to D^{(\ast )}{\bar{D}}^{(\ast )}$ effective couplings via the $X(3872)\to {\pi }^0{\chi }_{cJ}$ decays
• Two nearby states in the $X(3872)$ region: Resolving the radiative-decay ratio tension with ${\eta }_{c2}$
• Summary of Working Group 5: Physics with Heavy Flavours
• Search for the decays $X(3872)\to K_S^0{K}^{\pm }{\pi }^{\mp }$ and $K^{\ast }(892)\bar{K}$ at BESIII
• Exotic Charmonium at BESIII
• Search for the $e^{+}{e}^{-}\to \varphi {\chi }_{c1}(3872)$ process at BESIII
• Coupled-channel meson-meson scattering in the diabatic framework
• Three-body final state interactions in $B^{+}\to D\bar{D}{K}^{+}$ decays