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Register a new userSearch for the $X(2370)$ and observation of $eta_{c}toetaetaeta^prime$ in $J/psitogammaetaetaeta^{prime}$
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Using a sample of $1.31times10^{9} ~J/psi$ events collected with the BESIII detector, we perform a study of $J/psitogammaetaetaeta^{prime}$ to search for the $X(2370)$ and $eta_{c}$ in the $etaetaeta^{prime}$ invariant mass distribution. No significant signal for the $X(2370)$ is observed, and we set an upper limit for the product branching fraction of ${cal B}(J/psitogamma X(2370)cdot{cal B}(X(2370)toetaetaeta^{prime}) < 9.2times10^{-6}$ at the 90% confidence level. A clear $eta_{c}$ signal is observed for the first time, yielding a product branching fraction of ${cal B}(J/psito gammaeta_{c})cdot{cal B}(eta_{c}to etaetaeta^{prime}) = (4.86pm0.62~({rm stat.})pm0.45~({rm sys.}))times10^{-5}$.
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Using a sample of $1.31times10^{9} ~J/psi$ events collected with the BESIII detector, we perform a study of $J/psitogamma Kbar{K}eta$. The $X(2370)$ is observed in the $Kbar{K}eta$ invariant-mass distribution with a statistical significance of 8.3$sigma$. Its resonance parameters are measured to be $M = 2341.6 pm 6.5text{(stat.)} pm 5.7text{(syst.)}$~MeV/$c^{2}$ and $Gamma = 117 pm 10 text{(stat.)} pm 8 text{(syst.)}$~MeV. The product branching fractions for $J/psito gamma X(2370), X(2370) to K^{+} K^{-}eta$ and $J/psito gamma X(2370), X(2370) to K_{S}^{0} K_{S}^{0}eta$ are determined to be $(1.79 pm 0.23 text{(stat.)} pm 0.65 text{(syst.)}) times 10^{-5}$ and $(1.18 pm 0.32 text{(stat.)} pm 0.39 text{(syst.)}) times 10^{-5}$, respectively. No evident signal for the $X(2120)$ is observed in the $Kbar{K}eta$ invariant-mass distribution. The upper limits for the product branching fractions of $mathcal{B}(J/psi to gamma X(2120)togamma K^{+} K^{-} eta)$ and $mathcal{B}(J/psitogamma X(2120)togamma K_{S}^{0} K_{S}^{0} eta)$ are determined to be $1.49times10^{-5}$ and $6.38times10^{-6}$ at the 90% confidence level, respectively.
We have measured several branching ratios for $psi^prime$ decay using the data collected by FNAL E835 experiment during year 2000, obtaining ${cal B}(psi^prime to e^+ e^-) = 0.0068pm0.0001pm0.0004$, ${cal B}(psi^prime to J/psi pi^+ pi^-) = 0.292pm0.005pm0.018$, ${cal B}(psi^prime to J/psi pi^0 pi^0) = 0.167pm0.005pm0.014$ and ${cal B}(psi^prime to J/psi eta) = 0.028pm0.002pm0.002$. We also present a measurement of the dipion mass distribution in the decays $psi^prime to J/psi pi pi$.
The first search for $Z_{c}$ pair production in $Upsilon(1S)$ and $Upsilon(2S)$ decays and in $e^{+}e^{-}$ annihilation at $sqrt{s}$ = 10.52, 10.58, and 10.867 GeV is conducted using data collected with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant signals are observed in any of the studied modes, and the 90% credibility level upper limits on their product branching fractions in $Upsilon(1S)$ and $Upsilon(2S)$ decays (${cal B}(Upsilon(1S,2S)to Z^{+}_{c}Z^{(prime) -}_{c})times{cal B}(Z^{+}_{c}topi^{+}+cbar c)$ ($cbar c=J/psi$, $chi_{c1}(1P)$, $psi(2S)$)) and the product of Born cross section and branching fraction for $e^{+}e^{-} to Z^{+}_{c}Z^{(prime) -}_{c}$ ($sigma(e^+e^- to Z^{+}_{c}Z^{(prime) -}_{c})times {cal B}(Z^{+}_{c} to pi^+ +cbar c)$) at $sqrt{s}$ = 10.52, 10.58, and 10.867 GeV are determined. Here, $Z_{c}$ refers to the $Z_{c}(3900)$ and $Z_{c}(4200)$ observed in the $pi J/psi$ final state, the $Z_{c1}(4050)$ and $Z_{c2}(4250)$ in the $pichi_{c1}(1P)$ state, and the $Z_{c}(4050)$ and $Z_{c}(4430)$ in the $pipsi(2S)$ state.
We present the first search for the rare decay of $eta^prime$ into $K^{pm}pi^{mp}$ in $J/psitophieta^{prime}$, using a sample of $1.3times10^{9}$ $J/psi$ events collected with the BESIII detector. No significant signal is observed, and the upper limit at the 90% confidence level for the ratio $frac{{cal B}(eta^{prime}to K^{pm}pi^{mp})}{{cal B}(eta^{prime}togammapi^{+}pi^{-})}$ is determined to be $1.3times10^{-4}$. In addition, we report the measurement of the branching fraction of $J/psitophieta^{prime}$ to be $(5.10pm0.03(text{stat.})pm0.32(text{syst.}))times10^{-4}$, which agrees with previous results from BESII.
The first observation of the decay $eta_{c}(2S) to p bar p$ is reported using proton-proton collision data corresponding to an integrated luminosity of $3.0rm , fb^{-1}$ recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The $eta_{c}(2S)$ resonance is produced in the decay $B^{+} to [cbar c] K^{+}$. The product of branching fractions normalised to that for the $J/psi$ intermediate state, ${cal R}_{eta_{c}(2S)}$, is measured to be begin{align*} {cal R}_{eta_{c}(2S)}equivfrac{{mathcal B}(B^{+} to eta_{c}(2S) K^{+}) times {mathcal B}(eta_{c}(2S) to p bar p)}{{mathcal B}(B^{+} to J/psi K^{+}) times {mathcal B}(J/psito p bar p)} =~& (1.58 pm 0.33 pm 0.09)times 10^{-2}, end{align*} where the first uncertainty is statistical and the second systematic. No signals for the decays $B^{+} to X(3872) (to p bar p) K^{+}$ and $B^{+} to psi(3770) (to p bar p) K^{+}$ are seen, and the 95% confidence level upper limits on their relative branching ratios are % found to be ${cal R}_{X(3872)}<0.25times10^{-2}$ and ${cal R}_{psi(3770))}<0.10$. In addition, the mass differences between the $eta_{c}(1S)$ and the $J/psi$ states, between the $eta_{c}(2S)$ and the $psi(2S)$ states, and the natural width of the $eta_{c}(1S)$ are measured as begin{align*} M_{J/psi} - M_{eta_{c}(1S)} =~& 110.2 pm 0.5 pm 0.9 rm , MeV, M_{psi(2S)} -M_{eta_{c}(2S)} =~ & 52.5 pm 1.7 pm 0.6 rm , MeV, Gamma_{eta_{c}(1S)} =~& 34.0 pm 1.9 pm 1.3 rm , MeV. end{align*}
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