Z. G. Wang

Measurement of the absolute branching fractions of Λc+→Ληπ+ and Σ(1385)+η

Mikhail N. Achasov, S. Ahmed, M. Albrecht, M. Alekseev et autres

We study the decays ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}\ensuremath{\eta}{\ensuremath{\pi}}^{+}$ and $\mathrm{\ensuremath{\Sigma}}(1385{)}^{+}\ensuremath{\eta}$ based on ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}{\overline{\mathrm{\ensuremath{\Lambda}}}}_{c}^{\ensuremath{-}}$ pairs produced in ${e}^{+}{e}^{\ensuremath{-}}$ collisions at a center-of-mass energy of $\sqrt{s}=4.6\text{ }\text{ }\mathrm{GeV}$, corresponding to an integrated luminosity of $567\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. The data sample was accumulated with the BESIII detector at …

cn, ru, de, it, mn, us, tr, nl (code pays fourni par la source)

Improved measurements of χcJ→Σ+Σ¯− and Σ0Σ¯0 decays

Mikhail N. Achasov, S. Ahmed, M. Albrecht, M. Alekseev et autres

Using a data sample of $(448.1\ifmmode\pm\else\textpm\fi{}2.9)\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\ensuremath{\psi}(3686)$ events collected with the BESIII detector at the BEPCII collider, we present measurements of branching fractions for the decays ${\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{+}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{\ensuremath{-}}$ and ${\mathrm{\ensuremath{\Sigma}}}^{0}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{0}$. The decays ${\ensuremath{\chi}}_{c1,2}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{+}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{\ensuremath{-}}$ and ${\mathrm{\ensuremath{\Sigma}}}^{0}{\overline{\mathrm{\ensuremath{\Sigma}}}}^{0}$ are observed for the first time, and the …

cn, ru, de, it, us, tr, mn, nl (code pays fourni par la source)

Branching fraction measurement of J/ψ→KSKL and search for J/ψ→KSKS

Mikhail N. Achasov, S. Ahmed, M. Albrecht, M. Alekseev et autres

Using a sample of $1.31\ifmmode\times\else\texttimes\fi{}{10}^{9}\text{ }\text{ }J/\ensuremath{\psi}$ events collected with the BESIII detector at the BEPCII collider, we study the decays of $J/\ensuremath{\psi}\ensuremath{\rightarrow}{K}_{S}{K}_{L}$ and ${K}_{S}{K}_{S}$. The branching fraction of $J/\ensuremath{\psi}\ensuremath{\rightarrow}{K}_{S}{K}_{L}$ is determined to be $\mathcal{B}(J/\ensuremath{\psi}\ensuremath{\rightarrow}{K}_{S}{K}_{L})=(1.93\ifmmode\pm\else\textpm\fi{}0.01(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, which significantly improves on previous measurements. No …

cn, ru, de, it, us, tr, mn, nl (code pays fourni par la source)

Evidence for e+e−→γηc(1S) at center-of-mass energies between 4.01 and 4.60 GeV

Mikhail N. Achasov, S. Ahmed, M. Albrecht, M. Alekseev et autres

We present first evidence for the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c}(1S)$ at six center-of-mass energies between 4.01 and 4.60 GeV using data collected by the BESIII experiment operating at BEPCII. We measure the Born cross section at each energy using a combination of twelve ${\ensuremath{\eta}}_{c}(1S)$ …

cn, ru, de, it, us, tr, mn, nl (code pays fourni par la source)

Experimental Study on Running-in of Steel Fiction Pair of Block on Disk in Oil with Micro-and-Nano Diamond Powder

Xinpeng Xie, Z. G. Wang, S. L. Chen

cn (code pays fourni par la source)