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Register a new userMeasurement of branching fractions for $psi(3686)rightarrowgammaeta,gammaeta$ and $gammapi^{0}$
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Using a data sample of $448times10^{6}$ $psi(3686)$ events collected with the BESIII detector operating at the BEPCII storage ring, the decays $psi(3686)rightarrowgammaeta$ and $psi(3686)rightarrowgammapi^{0}$ are observed with a statistical significance of $7.3sigma$ and $ 6.7sigma$, respectively. The branching fractions are measured to be $mathcal{B}(psi(3686)rightarrowgammaeta)=(0.85pm0.18pm0.05)times10^{-6}$ and $mathcal{B}(psi(3686)rightarrowgammapi^{0})=(0.95pm0.16pm0.05)times10^{-6}$. In addition, we measure the branching fraction of $psi(3686)rightarrowgammaeta$ to be $mathcal{B}(psi(3686)rightarrowgammaeta)=(125.1pm2.2pm6.2)times 10^{-6}$, with improved precision compared to previous results.
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Using $1310.6times10^{6}$ $J/psi$ and $448.1times10^{6}$ $psi(3686)$ events collected with the BESIII detector, the branching fractions of $J/psi$ and $psi(3686)$ decays to $Sigma^{+}overline{Sigma}^{-}$ are measured to be $(10.61 pm 0.04 pm 0.36) times 10^{-4}$ and $(2.52 pm 0.04 pm 0.09) times 10^{-4}$, respectively. In addition, the ratio of $mathcal{B}(psi(3686) rightarrow Sigma^{+}overline{Sigma}^{-})/mathcal{B}(J/psi rightarrow Sigma^{+}overline{Sigma}^{-})$ is determined to be $(23.8 pm 1.1)%$ which violates the $12%$ rule.
Using a sample of $448.1times10^6$ $psi(3686)$ events collected with the BESIII detector, we perform a study of the decay $psi(3686) rightarrow phi pi^{+}pi^{-}eta$. The branching fraction of $psi(3686)rightarrowphieta^prime$ is determined to be $(1.51pm0.16pm0.12)times 10^{-5}$, which is consistent with the previous measurement but with significantly improved precision. The resonances $f_{1}(1285)$ and $eta(1405)$ are clearly observed in the $pi^{+}pi^{-}eta$ mass spectrum with statistical significances of $18sigma$ and $9.7sigma$, respectively. The corresponding product branching fractions are measured to be $mathcal{B}(psi(3686)rightarrowphi f_{1}(1285),f_{1}(1285)rightarrowpi^{+}pi^{-}eta) =(1.03pm0.10pm0.09)times 10^{-5}$ and $mathcal{B}(psi(3686)rightarrowphieta(1405),eta(1405)rightarrowpi^{+}pi^{-}eta) =(8.46pm1.37pm0.92)times 10^{-6}$.
Using 5.9~pb$^{-1}$ of $e^+e^-$ annihilation data collected at center-of-mass energies from 3.640 to 3.701 GeV with the BESIII detector at the BEPCII Collider, we measure the observed cross sections of $e^+e^-rightarrow K_{S}^{0} X$ (where $X= text{anything}$). From a fit to these observed cross sections with the sum of continuum and $psi(3686)$ and $J/psi$ Breit-Wigner functions and considering initial state radiation and the BEPCII beam energy spread, we obtain for the first time the product of $psi(3686)$ leptonic width and inclusive decay branching fraction $Gamma^{ee}_{psi(3686)}mathcal B(psi(3686)rightarrow K_{S}^{0} X) = (373.8 pm 6.7 pm 20.0)$ eV, and assuming $Gamma^{ee}_{psi(3686)}$ is $(2.33 pm 0.04)$ keV from PDG value, we measure $mathcal B(psi(3686)rightarrow K_{S}^{0} X) = (16.04 pm 0.29 pm 0.90)%$, where the first uncertainty is statistical and the second is systematic.
With $1.06times 10^8$ $psi(3686)$ events collected with the BESIII detector, the branching fraction of $psi(3686) to omega K^+ K^-$ is measured to be $(1.54 pm 0.04 pm 0.11) times 10^{-4}$. This is the most precise result to date, due to the largest $psi(3686)$ sample, improved signal reconstruction efficiency, good simulation of the detector performance, and a more accurate knowledge of the continuum contribution. Using the branching fraction of $J/psi to omega K^+ K^-$, the ratio $mathcal{B}(psi(3868) to K^+K^-) / mathcal{B}(J/psi to K^+K^-)$ is determined to be $(18.4 pm 3.7),%$. This constitutes a significantly improved test of the $12,%$ rule, with the uncertainty now dominated by the $J/psi$ branching fraction.
Using e^+e^- collision data corresponding to 5.88M Y(3S) [25.9M psi(2S)] decays and acquired by the CLEO III [CLEO-c] detectors operating at CESR, we study the single-pion transitions from Y(3S) [psi(2S)] to the respective spin-singlet states h_{b[c]}. Utilizing only the momentum of suitably selected transition-pi^0 candidates, we obtain the upper limit B(Y(3S) -> pi^0 h_b) < 1.2times 10^{-3} at 90% confidence level, and measure B(psi(2S) -> pi^0 h_c) = (9.0+-1.5+-1.3)times 10^{-4}. Signal sensitivities are enhanced by excluding very asymmetric pi^0 -> gamma gamma candidates.
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