Observation of a Neutral Structure near the $D{\bar{D}}^{\ast }$ Mass Threshold in $e^{+}{e}^{-}\to (D{\bar{D}}^{\ast }{)}^0{\pi }^0$ at $\sqrt{s}$ = 4.226 and 4.257 GeV

Abstract

A neutral structure in the $D{\bar{D}}^{\ast }$ system around the $D{\bar{D}}^{\ast }$ mass threshold is observed with a statistical significance greater than 10$\sigma$ in the processes $e^{+}{e}^{-}\to D^{+}{D}^{\ast -}{\pi }^0+c.c.$ and $e^{+}{e}^{-}\to D^0{\bar{D}}^{\ast 0}{\pi }^0+c.c.$ at $\sqrt{s}$ = 4.226 and 4.257 GeV in the BESIII experiment. The structure is denoted as $Z_c(3885{)}^0$. Assuming the presence of a resonance, its pole mass and width are determined to be ($3885.7_{-5.7}^{+4.3}$(stat)$\pm 8.4$(syst)) MeV/$c^2$ and ($35_{-12}^{+11}$(stat)$\pm 15$(syst)) MeV, respectively. The Born cross sections are measured to be $\sigma (e^{+}{e}^{-}\to Z_c(3885{)}^0{\pi }^0,Z_c(3885{)}^0\to D{\bar{D}}^{\ast })=(77\pm 13$(stat)$\pm 17$(syst)) pb at 4.226 GeV and ($47\pm 9$(stat)$\pm 10$(syst)) pb at 4.257 GeV. The ratio of decay rates $\frac{\mathcal{B}(Z_c(3885{)}^0\to D^{+}{D}^{\ast -}+c.c.)}{\mathcal{B}(Z_c(3885{)}^0\to D^0{\bar{D}}^{\ast 0}+c.c.)}$ is determined to be $0.96\pm 0.18$(stat)$\pm 0.12$(syst), consistent with no isospin violation in the process $Z_c(3885{)}^0\to D{\bar{D}}^{\ast }$.

7 pages, 2 figures

References in corpus (7)

• Heavy quarkonium: progress, puzzles, and opportunities
• 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
• Observation of $Z_c(3900{)}^0$ in $e^{+}{e}^{-}\to {\pi }^0{\pi }^{0}J/\psi$
• A New Hadron Spectroscopy
• Observation of a neutral charmoniumlike state $Z_c(4025{)}^0$ in $e^{+}{e}^{-}\to (D^{\ast }{\bar{D}}^{\ast }{)}^0{\pi }^0$
• Observation of a Neutral Structure near the $D{\bar{D}}^{\ast }$ Mass Threshold in $e^{+}{e}^{-}\to (D{\bar{D}}^{\ast }{)}^0{\pi }^0$ at $\sqrt{s}$ = 4.226 and 4.257 GeV
• Evidence for η_{c}(2S) in ψ(3686) \to γK_{S}^{0}K^{\pm}π^{\mp}π^{+}π^{-}

Cited by in corpus (54)

• Hadronic molecules
• The hidden-charm pentaquark and tetraquark states
• The $XYZ$ states: experimental and theoretical status and perspectives
• Multiquark Resonances
• Non-Standard Heavy Mesons and Baryons, an Experimental Review
• Heavy-Quark QCD Exotica
• Exotics: Heavy Pentaquarks and Tetraquarks
• Study of the doubly charmed tetraquark $T_{cc}^{+}$
• Threshold cusps and triangle singularities in hadronic reactions
• Multiquark States
• Observation of a near-threshold structure in the $K^{+}$ recoil-mass spectra in $e^{+}{e}^{-}\to K^{+}(D_s^{-}{D}^{\ast 0}+D_s^{\ast -}{D}^0)$
• Heavy-flavored tetraquark states with the $QQ\bar{Q}\bar{Q}$ configuration
• The XYZ states revisited
• Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners
• Amplitude analysis and the nature of the Zc(3900)
• Observation of a Neutral Structure near the $D{\bar{D}}^{\ast }$ Mass Threshold in $e^{+}{e}^{-}\to (D{\bar{D}}^{\ast }{)}^0{\pi }^0$ at $\sqrt{s}$ = 4.226 and 4.257 GeV
• Observation of $e^{+}{e}^{-}\to \omega {\chi }_{c1,2}$ near $\sqrt{s}$ = 4.42 and 4.6 GeV
• Systematic studies of charmonium-, bottomonium-, and $B_c$-like tetraquark states
• Study of the process $e^{+}{e}^{-}\to {\pi }^0{\pi }^{0}J/\psi$ and neutral charmonium-like state $Z_c(3900{)}^0$
• The BESIII Physics Programme
• Z_c -like spectra from QCD Laplace sum rules at NLO
• Surveying exotic pentaquarks with the typical $QQqq\bar{q}$ configuration
• Radiative decays of the neutral $Z_c(3900)$
• Triply heavy tetraquark states with the $QQ\bar{Q}\bar{q}$ configuration
• Charmonium and Charmoniumlike States at the BESIII Experiment
• A unified description of the hidden-charm tetraquark states $Z_{cs}(3985)$, $Z_c(3900)$ and $X(4020)$
• Evidence for a neutral near-threshold structure in the $K_{\mathrm{S}}^0$ recoil-mass spectra in $e^{+}{e}^{-}\to K_{\mathrm{S}}^0{D}_s^{+}{D}^{\ast -}$ and $e^{+}{e}^{-}\to K_{\mathrm{S}}^0{D}_s^{\ast +}{D}^{-}$
• Measurement of $e^{+}{e}^{-}\to {\pi }^0{\pi }^0\psi (3686)$ at $\sqrt{s}$ from 4.009 to 4.600 GeV and observation of a neutral charmoniumlike structure
• A coupled-channel lattice study on the resonance-like structure $Z_c(3900)$
• Precise determination of the pole position of the exotic $Z_c(3900)$
• Observation of $e^{+}{e}^{-}\to \eta h_c$ at center-of-mass energies from 4.085 to 4.600 GeV
• Search for a strangeonium-like structure $Z_s$ decaying into $\varphi \pi$ and a measurement of the cross section $e^{+}{e}^{-}\to \varphi \pi \pi$
• 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 $p\bar{p}$
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• Exotic pentaquark states with the $qqQQ\bar{Q}$ configuration
• Physics Accomplishments and Future Prospects of the BES Experiments at the BEPC Collider
• Observation of $e^{+}{e}^{-}\to \varphi {\chi }_{c1}$ and $\varphi {\chi }_{c2}$ at $\sqrt{s}$=4.600 GeV
• Towards the understanding of $Z_c(3900)$ from lattice QCD
• Simultaneous description of the $e^{+}{e}^{-}\to J/\psi \pi \pi (K\bar{K})$ processes
• Radially excited axial mesons and the enigmatic $Z_c$ and $Z_b$ in a coupled-channel model
• Observation of $e^{+}{e}^{-}\to D_s^{+}\overline{D}{}^{(\ast )0}{K}^{-}$ and study of the $P$-wave $D_s$ mesons
• Properties of $Z_c(3900)$ tetraquark in a cold nuclear matter
• Universal non-resonant explanation to charmoniumlike structures $Z_c(3885)$ and $Z_c(4025)$
• Measurements of $e^{+}{e}^{-}\to {\eta }_{\mathrm{c}}{\pi }^{+}{\pi }^{-}{\pi }^0$, ${\eta }_{\mathrm{c}}{\pi }^{+}{\pi }^{-}$ and ${\eta }_{\mathrm{c}}{\pi }^0\gamma$ at $\sqrt{s}$ from 4.18 to 4.60\,GeV, and search for a $Z_{\mathrm{c}}$ state close to the $D\bar{D}$ threshold decaying to ${\eta }_{\mathrm{c}}\pi$ at $\sqrt{s}$ = 4.23 GeV
• Isospin analysis of $B\to D^{\ast }\bar{D}K$ and the absence of the $Z_c(3900)$ in $B$ decays
• Charmoniumlike Channels $1^{+}$ with Isospin $1$ from Lattice and Effective Field Theory
• Radiative decays of the neutral $Z_c(3900)$ and $Z_c(4020)$
• Novel correlated $D^0\overline{D}{}^0$ systems for $c/b$ physics and tests of $T/CPT$
• Study of the hidden charm pentaquarks ${\Lambda }_{c\bar{c}}$ above $4$ GeV
• Spin and polarization analysis of $Z_{cs}$ state
• Studies of Charmonium-like States at BESIII
• Recent Results on Hadron Spectroscopy from BESIII
• Parametrically narrow tetraquark states containing one heavy quark and one heavy antiquark