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Register a new userSearch for the $eta_{c2}(1D)$ in $e^+e^-togammaeta_{c2}(1D)$ at $sqrt{s}$ near 10.6 GeV at Belle
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For the first time we search for the $eta_{c2}(1D)$ in $e^+e^-togammaeta_{c2}(1D)$ at $sqrt{s}$ = 10.52, 10.58, and 10.867 GeV with data samples of 89.5 fb$^{-1}$, 711 fb$^{-1}$, and 121.4 fb$^{-1}$, respectively, accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant $eta_{c2}(1D)$ signal is observed in the mass range between 3.8 and 3.88 GeV/$c^2$. The upper limit at 90% confidence level on the product of the Born cross section for $e^+e^- to gammaeta_{c2}(1D)$ and branching fraction for $eta_{c2}(1D)to gamma h_c(1P)$ is determined to be $sigma(e^+e^- to gammaeta_{c2}(1D)){cal B}(eta_{c2}(1D)to gamma h_c(1P))$ $<$ 4.9 fb at $sqrt{s}$ near 10.6 GeV.
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Using data samples of 89.5~fb$^{-1}$, 711.0~fb$^{-1}$, and 121.4~fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider at center-of-mass energies 10.52 GeV, 10.58 GeV, and 10.867 GeV, respectively, we study the exclusive reactions $e^+e^-togammachi_{cJ}$ ($J = 0,~1,~2$) and $e^+e^-togammaeta_c$. A significant $gamma chi_{c1}$ signal is observed for the first time at $sqrt{s}=10.58$ GeV with a significance of $5.1sigma$ including systematic uncertainties. No significant excesses for $gamma chi_{c0}$, $gamma chi_{c2}$, and $gamma eta_c$ final states are found, and we set 90% credibility level upper limits on the Born cross sections ($sigma_{rm B}$) at 10.52 GeV, 10.58 GeV, and 10.867~GeV. Together with cross sections measured by BESIII at lower center-of-mass energies, the energy dependency of $sigma_{rm B}(e^+e^-togammachi_{c1})$ is obtained.
The first dedicated search for the $eta_{c2}(1D)$ is carried out using the decays $B^+ rightarrow eta_{c2}(1D) K^+$, $B^0 rightarrow eta_{c2}(1D) K^0_S$, $B^0 rightarrow eta_{c2}(1D) pi^- K^+$, and $B^+ rightarrow eta_{c2}(1D) pi^+ K^0_S$ with $eta_{c2}(1D) to h_c gamma$. No significant signal is found. For the $eta_{c2}(1D)$ mass range between $3795$ and $3845 mathrm{MeV}/c^2$, the branching-fraction upper limits are determined to be $mathcal{B}(B^+ rightarrow eta_{c2}(1D) K^+) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 3.7 times 10^{-5}$, $mathcal{B}(B^0 rightarrow eta_{c2}(1D) K^0_S) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 3.5 times 10^{-5}$, $mathcal{B}(B^0 rightarrow eta_{c2}(1D) pi^- K^+) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 1.0 times 10^{-4}$, and $mathcal{B}(B^+ rightarrow eta_{c2}(1D) pi^+ K^0_S) times mathcal{B}(eta_{c2}(1D) to h_c gamma) < 1.1 times 10^{-4}$ at 90% C. L. The analysis is based on the 711 $mathrm{fb}^{-1}$ data sample collected on the $Upsilon(4S)$ resonance by the Belle detector, which operated at the KEKB asymmetric-energy $e^+ e^-$ collider.
Using a data sample collected with the BESIII detector operating at the BEPCII storage ring at a center-of-mass energy of $sqrt{s}=4.600$ GeV, we search for the production of $e^{+}e^{-} to phichi_{c0,1,2}$ and the charmonium-like state $Y(4140)$ in the radiative transition $e^{+}e^{-} to gamma Y(4140)$ with $Y(4140)$ subsequently decaying into $phi J/psi$. The processes $e^{+}e^{-} to phichi_{c1}$ and $phichi_{c2}$ are observed for the first time, each with a statistical significance of more than 10sigma, and the Born cross sections are measured to be $(4.2^{+1.7}_{-1.0}pm 0.3)$ pb and $(6.7^{+3.4}_{-1.7}pm 0.5)$ pb, respectively, where the first uncertainties are statistical and the second systematic. No significant signals are observed for $e^{+}e^{-} to phichi_{c0}$ and $e^{+}e^{-} to gamma Y(4140)$ and upper limits on the Born cross sections at $90%$ confidence level are provided at $sqrt{s}=4.600$ GeV.
Using data samples of 89 fb$^{-1}$, 703 fb$^{-1}$, and 121 fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider at center-of-mass energies 10.52 GeV, 10.58 GeV, and 10.876 GeV, respectively, we study the exclusive reactions $e^+e^- to omegapi^0$, $K^{ast}(892)bar{K}$, and $K_2^{ast}(1430)bar{K}$ (Charge-conjugate modes are included implicitly). Significant signals of $omegapi^0$, $K^{ast}(892)^0bar{K}^0$, and $K_2^{ast}(1430)^-K^+$ are observed for the first time at these energies, and the energy dependencies of the cross sections are presented. On the other hand, no significant excesses for $K^{ast}(892)^-K^+$ and $K_2^{ast}(1430)^0 bar{K}^0$ are found, and we set limits on the cross section ratios $R_{rm VP} = frac{sigma_B(e^+e^-to K^{ast}(892)^0bar K^0)} {sigma_B(e^+e^-to K^{ast}(892)^-K^+)}>$ 4.3, 20.0, and 5.4, and $R_{rm TP} = frac{sigma_B(e^+e^-to K_2^{ast}(1430)^0bar K^0)} {sigma_B(e^+e^-to K_2^{ast}(1430)^-K^+)}<$ 1.1, 0.4, and 0.6, for center-of-mass energies of 10.52 GeV, 10.58 GeV, and 10.876 GeV, respectively, at the 90% C.L.
We report the results of a search for the $X(1835)$ state in the process $e^+e^-to J/psi+X(1835)$ using a data sample of 672 fb$^{-1}$ collected with the Belle detector at and near the $Upsilon(4S)$ resonance at the KEKB asymmetric-energy $e^+e^-$ collider. No significant evidence is found for this process, and an upper limit is set on its cross section times the branching fraction: $sigma_{rm Born}(e^+e^- to J/psi X(1835)) cdot$ {${cal B}(X(1835)to ge 3$ charged tracks)} $< 1.3 {rm fb}$ at 90% confidence level.
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