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Register a new userImproved measurements of branching fractions for $eta_ctophiphi$ and $omegaphi$
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Using $(223.7pm1.4)times10^6$ J/$psi$ events accumulated with the BESIII detector, we study $eta_c$ decays to $phiphi$ and $omegaphi$ final states. The branching fraction of $eta_ctophiphi$ is measured to be $Br(eta_ctophiphi)=(2.5pm0.3^{+0.3}_{-0.7}pm0.6)times10^{-3}$, where the first uncertainty is statistical, the second is systematic, and the third is from the uncertainty of $Br(J/psitogammaeta_c)$. No significant signal for the double OZI-suppressed decay of $eta_ctoomegaphi$ is observed, and the upper limit on the branching fraction is determined to be $Br(eta_ctoomegaphi)<2.5times 10^{-4}$ at the 90% confidence level.
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Using $e^+e^-$ annihilation data taken at the CESR collider with the CLEO-c detector, measurements of two main $Omega^-$ branching fractions have been made using the reaction $psi(2S)toOmega^-overline{Omega}^+$, hyperon pair production at $sqrt{s}=3.69$~GeV, the peak of the $psi(2S)$ resonance. $Omega^-$ decay channels are identified through momentum distributions of charged particles, and systematics of the $Omega^-$ branching fractions have been studied. The result gives: $mathcal{B}(Omega^- to Lambda^0 K^-) = (68.9pm9.5pm4.3)%$, and $ mathcal{B}(Omega^- to Xi^0 pi^-) = (19.0pm4.0pm1.2)%$.
By analyzing 2.93 fb$^{-1}$ of $e^+e^-$ annihilation data taken at the center-of-mass energy $sqrt s=$ 3.773 GeV with the BESIII detector, we determine the branching fractions of the inclusive decays $D^+tophi X$ and $D^0tophi X$ to be $(1.135pm0.034pm0.031)%$ and $(1.091pm0.027pm0.035)%$, respectively, where $X$ denotes any possible particle combination. The first uncertainties are statistical and the second systematic. We also determine the branching fractions of the decays $Dtophi X$ and their charge conjugate modes $bar{D}tophi bar{X}$ separately for the first time, and no significant CP asymmetry is observed.
We present a precision study of the $psiptopi^0 J/psi$ and $eta J/psi$ decay modes. The measurements are obtained using $106times10^6$ $psi$ events accumulated with the BESIII detector at the BEPCII $ee$ collider operating at a center-of-mass energy corresponding to the $psip$ mass. We obtain $mathcal{B}(psiptopi^0 J/psi)=(1.26pm0.02{rm (stat.)}pm0.03{rm (syst.)})times 10^{-3}$ and $mathcal{B}(psiptoeta J/psi)=(33.75pm0.17{rm (stat.)}pm0.86{rm (syst.)})times 10^{-3}$. The branching fraction ratio $R=frac{mathcal{B}(psiptopi^0 J/psi)}{mathcal{B}(psiptoeta J/psi)}$ is determined to be $(3.74pm0.06 {rm(stat.)}pm0.04 {rm(syst.)})times 10^{-2}$. The precision of these measurements of $mathcal{B}(psiptopi^{0} J/psi)$ and $R$ represent a significant improvement over previously published values.
We report the first measurements of absolute branching fractions for the $W$-exchange-only processes $Lambda^+_ctoXi^0K^+$ and $Lambda^+_ctoXi(1530)^0K^+$ with the double-tag technique, by analyzing an $e^{+}e^{-}$ collision data sample, that corresponds to an integrated luminosity of 567 pb$^{-1}$ collected at a center-of-mass energy of 4.6 GeV by the BESIII detector. The branching fractions are measured to be $mathcal{B}(Lambda^+_ctoXi^0K^+)=(5.90pm0.86pm0.39)times10^{-3}$ and $mathcal{B}(Lambda^+_ctoXi(1530)^0K^+)=(5.02pm0.99pm0.31)times10^{-3}$, where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.
The branching fractions of Ds meson decays serve to normalize many measurements of processes involving charm quarks. Using 586 pb^-1 of e+ e- collisions recorded at a center of mass energy of 4.17 GeV, we determine absolute branching fractions for 13 Ds decays in 16 reconstructed final states with a double tag technique. In particular we make a precise measurement of the branching fraction B(Ds -> K- K+ pi+) = (5.55 +- 0.14 +- 0.13)%, where the uncertainties are statistical and systematic respectively. We find a significantly reduced value of B(Ds -> pi+ pi0 eta) compared to the world average, and our results bring the inclusively and exclusively measured values of B(Ds -> eta X)$ into agreement. We also search for CP-violating asymmetries in Ds decays and measure the cross-section of e+ e- -> Ds* Ds at Ecm = 4.17 GeV.
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