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Register a new userMeasurement of the inclusive branching fraction for $psi(3686)rightarrow K_{S}^{0} + text{anything}$
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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.
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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.
A measurement of the relative branching fraction of $B_{s}^{0} rightarrow J/ps i f_{0}(980), f_{0}(980) rightarrow pi^{+}pi^{-}$ to $B_{s}^{0} rightarrow J/psi phi, p hi rightarrow K^{+}K^{-}$ is presented. The decay mode $B_{s}^{0} rightarrow J/psi f_{0}(980)$ is an interesting mode since it is a CP-odd eigenstate which could be used in CP-violating studies. Using approximat ely 8 $rm{fb}^{-1}$ of data recorded with the D0 detector at the Fermilab Tevatron Collider, a relative branching fraction of 0.210 $pm$ 0.032thinspace(stat) $pm$ 0.036thi nspace(syst) is found.
Analyzing $(448.1pm2.9)times10^6$ $psi(3686)$ events collected with the BESIII detector at the BEPCII collider, the $psi(3686)to omega K_{S}^{0}K_{S}^{0}$ decay is observed for the first time. The branching fraction for this decay is determined to be $mathcal{B}_{psi(3686)to omega K_{S}^{0}K^{0}_{S}}$=$(7.04pm0.39pm0.36)$$times10^{-5}$, where the first uncertainty is statistical and the second is systematic.
A branching fraction measurement of the $B^{0}rightarrow D_{s}^{+}pi^{-}$ decay is presented using proton-proton collision data collected with the LHCb experiment, corresponding to an integrated luminosity of $5.0,$fb$^{-1}$. The branching fraction is found to be ${mathcal{B}(B^{0}rightarrow D_{s}^{+}pi^{-}) = (19.4 pm 1.8pm 1.3 pm 1.2)times 10^{-6}}$, where the first uncertainty is statistical, the second systematic and the third is due to the uncertainty on the $B^0 to D^{-}pi^{+}$, $D_{s}^{+}rightarrow K^{+}K^{-}pi^{+}$ and $D^{-}rightarrow K^{+}pi^{-}pi^{-}$ branching fractions. This is the most precise single measurement of this quantity to date. As this decay proceeds through a single amplitude involving a $b to u$ charged-current transition, the result provides information on non-factorisable strong interaction effects and the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element $V_{ub}$. Additionally, the collision energy dependence of the hadronisation-fraction ratio $f_s/f_d$ is measured through $bar{B}{}_{s}^{0}rightarrow D_{s}^{+}pi^{-}$ and $B^0 to D^{-}pi^{+}$ decays.
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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