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Register a new userMeasurement of Branching Fractions of $psi(3686)rightarrowphieta^prime, phi f_1(1285)$ and $phi eta(1405)$
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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 $mathcal{B}(psi(3686)rightarrowphieta(1405),eta(1405)rightarrowpi^{+}pi^{-}eta) =(8.46pm1.37pm0.92)times 10^{-6}$.
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Decays of Bs and B0 mesons into J/psi pi +pi -pi +pi - final states, produced in pp collisions at the LHC, are investigated using data corresponding to an integrated luminosity of 3/fb collected with the LHCb detector. B^0_(s) -> Jpsi f_1(1285) decays are seen for the first time, and the branching fractions are measured. Using these rates, the f_1(1285) mixing angle between strange and non-strange components of its wave function in the q-qbar structure model is determined to be pm (24.0^{+3.1+0.6}_{-2.6-0.8}) degrees. Implications on the possible tetraquark nature of the f_1(1285) are discussed.
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.
Based on a sample of $(1310.6 pm 7.0) times 10^6~J/psi$ events collected with the BESIII detector, we present measurements of $J/psi$ and $eta^prime$ absolute branching fractions using the process $J/psirightarrowgammaeta^prime$. By analyzing events where the radiative photon converts into an $e^+e^-$ pair, the branching fraction for $J/psi rightarrow gamma eta^prime$ is measured to be $(5.27pm0.03pm0.05)times 10^{-3}$. The absolute branching fractions of the five dominant decay channels of the $eta^prime$ are then measured independently for the first time and are determined to be $mathcal{B}(eta^prime rightarrow gamma pi^{+} pi^{-})$ = (29.90$pm$0.03$pm$0.55)%, $mathcal{B}(eta^prime rightarrow eta pi^{+} pi^{-})$ = (41.24$pm$0.08$pm$1.24)%, $mathcal{B}(eta^prime rightarrow eta pi^{0} pi^{0})$ = (21.36$pm$0.10$pm$0.92)%, $mathcal{B}(eta^prime rightarrow gamma omega)$ = (2.489$pm$0.018$pm$0.074)%, and $mathcal{B}(eta^prime rightarrow gamma gamma)$ = (2.331$pm$0.012$pm$0.035)%, where the first uncertainties are statistical and the second systematic.
Using a data sample of $4.48times10^{8}$ $psip$ events collected with the BESIII detector, we present a first observation of $psi(3686)to pbar{p}phi$, and we measure its branching fraction to be $[6.06pm0.38 ($stat.$) pm 0.48 ($syst.$)]times10^{-6}$. In contrast to the earlier discovery of a threshold enhancement in the $pbar{p}$-mass spectrum of the channel $J/psitogamma pbar p$, denoted as $X(pbar{p})$, we do not find a similar enhancement in $psi(3686)to pbar{p}phi$. An upper limit of $1.82times10^{-7}$ at the $90%$ confidence level on the branching fraction of $psi(3686)to X(pbar{p})phito pbar{p}phi$ is obtained.
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.
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