اشترك بالحزمة الذهبية واحصل على وصول غير محدود شمرا أكاديميا
تسجيل مستخدم جديدStudy of $psi$ decays to the $Xi^{-}barXi^{+}$ and $Sigma(1385)^{mp}barSigma(1385)^{pm}$ final states
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We study the decays of the charmonium resonances $J/psi$ and $psi(3686)$ to the final states $Xi^{-}barXi^{+}$, $Sigma(1385)^{mp}barSigma(1385)^{pm}$ based on a single baryon tag method using data samples of $(223.7 pm 1.4) times 10^{6}$ $J/psi$ and $(106.4 pm 0.9) times 10^{6}$ $psi(3686)$ events collected with the BESIII detector at the BEPCII collider. The decay $psi(3686)rightarrowSigma(1385)^{mp}barSigma(1385)^{pm}$ is observed for the first time, and the measurements of the other processes, including the branching fractions and angular distributions, are in good agreement with and much more precise than the previously published results. Additionally, the ratios $frac{{cal{B}}(psi(3686)rightarrowXi^{-}barXi^{+})}{{cal{B}}(J/psirightarrowXi^{-}barXi^{+})}$, $frac{{cal{B}}(psi(3686)rightarrowSigma(1385)^{-}barSigma(1385)^{+})}{{cal{B}}(J/psirightarrowSigma(1385)^{-}barSigma(1385)^{+})}$ and $frac{{cal{B}}(psi(3686)rightarrowSigma(1385)^{+}barSigma(1385)^{-})}{{cal{B}}(J/psirightarrowSigma(1385)^{+}barSigma(1385)^{-})}$ are determined.
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We study the decays of $J/psi$ and $psi(3686)$ to the final states $Sigma(1385)^{0}barSigma(1385)^{0}$ and $Xi^0barXi^{0}$ based on a single baryon tag method using data samples of $(1310.6 pm 7.0) times 10^{6}$ $J/psi$ and $(447.9 pm 2.9) times 10^{
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Large samples of Lambda, Sigma(1385) and Xi(1321) hyperons produced in deep-inelastic muon scattering off a ^6LiD target were collected with the COMPASS experimental setup at CERN. The relative yields of Sigma(1385)^+, Sigma(1385)^-, bar{Sigma}(1385)
^-, bar{Sigma}(1385)^+, Xi(1321)^-, and bar{Xi}(1321)^+ hyperons decaying into Lambda(bar{Lambda})pi were measured. The heavy hyperon to Lambda and heavy antihyperon to bar{Lambda} yield ratios were found to be in the range 3.8% to 5.6% with a relative uncertainty of about 10%. They were used to tune the parameters relevant for strange particle production of the LEPTO Monte Carlo generator.
Using $1310.6times10^6$ $J/psi$ and $447.9times10^6$ $psi(3686)$ events collected with the BESIII detector at the BEPCII $e^{+}e^{-}$ collider, the branching fractions and the angular distributions of $J/psi$ and $psi(3686)$ decays to $Lambdabar{Lamb
da}$ and $Sigma^0bar{Sigma}^0$ final states are measured. The branching fractions are in agreement with, and much more precise than, the averages of previously published results. The polar angular distributions of $psi(3686)$ decays are measured for the first time, while those of $J/psi$ decays are measured with much improved precision. In addition, the ratios of branching fractions $frac{mathcal{B}(psi(3686)toLambdabar{Lambda})}{mathcal{B}(J/psitoLambdabar{Lambda})}$ and $frac{mathcal{B}(psi(3686)toSigma^0bar{Sigma}^0)}{mathcal{B}(J/psitoSigma^0bar{Sigma}^0)}$ are determined to test the 12% rule.
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