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Register a new userObservation of $e^{+}e^{-} rightarrow Kbar{K}J/psi$ at center-of-mass energies from 4.189 to 4.600 GeV
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We investigate the process $e^{+}e^{-} rightarrow Kbar{K}J/psi$ at center-of-mass energies from 4.189 to 4.600 GeV using 4.7 fb$^{-1}$ of data collected by the BESIII detector at the BEPCII collider. The Born cross sections for the reactions $e^{+}e^{-} rightarrow K^{+}K^{-}J/psi$ and $K_{S}^{0} K_{S}^{0} J/psi$ are measured as a function of center-of-mass energy. The energy dependence of the cross section for $e^{+}e^{-} rightarrow K^{+}K^{-}J/psi$ is shown to differ from that for $pi^{+}pi^{-}J/psi$ in the region around the $Y(4260)$. In addition, there is evidence for a structure around 4.5 GeV in the $e^{+}e^{-} rightarrow K^{+}K^{-}J/psi$ cross section that is not present in $pi^{+}pi^{-}J/psi$.
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The process $e^{+}e^{-}to eta^{prime} J/psi$ is observed for the first time with a statistical significance of $8.6sigma$ at center-of-mass energy $sqrt{s} = 4.226$ GeV and $7.3sigma$ at $sqrt{s} = 4.258$ GeV using data samples collected with the BESIII detector. The Born cross sections are measured to be $(3.7 pm 0.7 pm 0.3)$ and $(3.9 pm 0.8 pm 0.3)$ pb at $sqrt{s} = 4.226$ and $4.258$ GeV, respectively, where the first errors are statistical and the second systematic. Upper limits at the 90% confidence level of the Born cross sections are also reported at other 12 energy points.
Using a total of $5.25~{rm fb}^{-1}$ of $e^{+}e^{-}$ collision data with center-of-mass energies from 4.236 to 4.600 GeV, we report the first observation of the process $e^{+}e^{-}to etapsi(2S)$ with a statistical significance of $5sigma$. The data sets were collected by the BESIII detector operating at the BEPCII storage ring. We measure the yield of events integrated over center-of-mass energies and also present the energy dependence of the measured cross section.
We observe for the first time the process $e^{+}e^{-} rightarrow eta h_c$ with data collected by the BESIII experiment. Significant signals are observed at the center-of-mass energy $sqrt{s}=4.226$ GeV, and the Born cross section is measured to be $(9.5^{+2.2}_{-2.0} pm 2.7)$ pb. Evidence for $eta h_c$ is observed at $sqrt{s}=4.358$ GeV with a Born cross section of $(10.0^{+3.1}_{-2.7} pm 2.6)$ pb, and upper limits on the production cross section at other center-of-mass energies between 4.085 and 4.600 GeV are determined.
We report a measurement of the observed cross sections of the inclusive $J/psi$ production in $e^+e^-rightarrow {J}/psi{rm X}$ based on 3.21 fb$^{-1}$ of data accumulated at energies from 3.645 to 3.891 GeV with the BESIII detector operated at the BEPCII collider. The energy-dependent lineshape obtained from the measured cross sections cannot be well described by two Breit-Wigner (BW) amplitudes of the expected decays $psi(3686)rightarrow {J}/psi{rm X}$ and $psi(3770)rightarrow {J}/psi{rm X}$. Instead it can be better described with three BW amplitudes of the decays $psi(3686)rightarrow {J}/psi{rm X}$, $R(3760)rightarrow {J}/psi{rm X}$ and $R(3790)rightarrow {J}/psi{rm X}$ with two distinct structures referred to as $R(3760)$ and $R(3790)$. Under this assumption, we extracted their masses, total widths, and the product of the leptonic width and decay branching fractions to be $M_{R(3760)}= {3761.7pm 2.2 pm 1.2}$ MeV/$c^2$, $Gamma^{rm tot}_{R(3760)}= {6.7pm 11.1 pm 1.1}$ MeV, $Gamma^{ee}_{R(3760)}mathcal B[R(3760)rightarrow {J}/psi {rm X}]=(4.0pm 4.3pm 1.2)$ eV, $M_{R(3790)} = {3784.7pm 5.7 pm 1.6}$ MeV/$c^2$, $Gamma^{rm tot}_{R(3790)} = {31.6 pm 11.9 pm 3.2}$ MeV, $Gamma^{ee}_{R(3790)}mathcal B[R(3790)rightarrow {J}/psi {rm X}]=(18.1pm 10.3pm 4.7)$ eV, where the first uncertainties are statistical and second systematic.
Using data samples collected with the BESIII detector at the BEPCII collider at six center-of-mass energies between 4.008 and 4.600 GeV, we observe the processes $e^+e^-rightarrow phiphiomega$ and $e^+e^-rightarrow phiphiphi$. The Born cross sections are measured and the ratio of the cross sections $sigma(e^+e^-rightarrow phiphiomega)/sigma(e^+e^-rightarrow phiphiphi)$ is estimated to be $1.75pm0.22pm0.19$ averaged over six energy points, where the first uncertainty is statistical and the second is systematic. The results represent first measurements of these interactions.
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