Accès ouvert
2011
article
OpenAlex
M. N. Achasov, Diego Alberto, Q. An, Zhenghua An et autres
Using a sample of $(225.2\ifmmode\pm\else\textpm\fi{}2.8)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $J/\ensuremath{\psi}$ events collected with the Beijing Spectrometer at the Beijing Electron-Positron Collider, $CP$ and $P$ violating decays of $\ensuremath{\eta}$, ${\ensuremath{\eta}}^{\ensuremath{'}}$, and ${\ensuremath{\eta}}_{c}$ into ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ are searched for in $J/\ensuremath{\psi}$ radiative decays. No significant $\ensuremath{\eta}$, ${\ensuremath{\eta}}^{\ensuremath{'}}$, …
ru, jp, it, cn, de, nl, us, pk, hk
(code pays fourni par la source)
Accès ouvert
2011
article
OpenAlex
M. N. Achasov, Diego Alberto, L. An, Q. An et autres
First measurements of the decays of the three ${\ensuremath{\chi}}_{cJ}$ states to $p\overline{p}{K}^{+}{K}^{\ensuremath{-}}$ final states are presented. Intermediate $\ensuremath{\phi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ and $\ensuremath{\Lambda}(1520)\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}$ resonance states are observed, and branching fractions for ${\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}\overline{p}{K}^{+}\ensuremath{\Lambda}(1520)$, $\ensuremath{\Lambda}(1520)\overline{\ensuremath{\Lambda}}(1520)$, and $\ensuremath{\phi}p\overline{p}$ are reported. We also measure branching fractions for direct ${\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}p\overline{p}{K}^{+}{K}^{\ensuremath{-}}$ …
us, ru, it, cn, ua, pk, jp, hk
(code pays fourni par la source)
Accès ouvert
2011
article
OpenAlex
M. N. Achasov, L. An, Q. An, Zhongfu An et autres
With a sample of $(225.2\ifmmode\pm\else\textpm\fi{}2.8)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $J/\ensuremath{\psi}$ events registered in the BESIII detector, $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\eta}}^{\ensuremath{'}}$ is studied using two ${\ensuremath{\eta}}^{\ensuremath{'}}$ decay modes: ${\ensuremath{\eta}}^{\ensuremath{'}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\eta}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\rho}}^{0}$. The $X(1835)$, which was previously observed by BESII, is confirmed with a statistical significance that is larger than $20\ensuremath{\sigma}$. …
cn, ru, it, de, us, ua, pk, nl, jp, hk
(code pays fourni par la source)
Accès ouvert
2011
article
OpenAlex
M. N. Achasov, L. An, Q. An, Zhenghua An et autres
Using samples of $2.25\ifmmode\times\else\texttimes\fi{}{10}^{8}$ $J/\ensuremath{\psi}$ events and $1.06\ifmmode\times\else\texttimes\fi{}{10}^{8}$ ${\ensuremath{\psi}}^{\ensuremath{'}}$ events collected with the BES III detector, we study the ${f}_{0}(980)\ensuremath{\rightarrow}{a}_{0}^{0}(980)$ and ${a}_{0}^{0}(980)\ensuremath{\rightarrow}{f}_{0}(980)$ transitions in the processes $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\phi}{f}_{0}(980)\ensuremath{\rightarrow}\ensuremath{\phi}{a}_{0}^{0}(980)$ and ${\ensuremath{\chi}}_{c1}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{a}_{0}^{0}(980)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{f}_{0}(980)$, respectively. Evidence for ${f}_{0}(980)\ensuremath{\rightarrow}{a}_{0}^{0}(980)$ is found with a significance of $3.4\ensuremath{\sigma}$, while in …
us, ru, cn, ua, it, pk, jp, hk
(code pays fourni par la source)
Accès ouvert
2011
article
OpenAlex
M. N. Achasov, L. An, Q. An, Zhenghua An et autres
The Dalitz plot of ${\ensuremath{\eta}}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\eta}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decay is studied using $(225.2\ifmmode\pm\else\textpm\fi{}2.8)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $J/\ensuremath{\psi}$ events collected with the BESIII detector at the BEPCII ${e}^{+}{e}^{\ensuremath{-}}$ collider. With the largest sample of ${\ensuremath{\eta}}^{\ensuremath{'}}$ decays to date, the parameters of the Dalitz plot are determined in a generalized …
cn, ru, it, de, nl, us, ua, pk, jp, hk
(code pays fourni par la source)
Accès ouvert
2010
article
OpenAlex
M. N. Achasov, L. An, Q. An, Zhenghua An et autres
The decays ${\ensuremath{\psi}}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{0}$, $\ensuremath{\gamma}\ensuremath{\eta}$ and $\ensuremath{\gamma}{\ensuremath{\eta}}^{\ensuremath{'}}$ are studied using data collected with the BESIII detector at the BEPCII ${e}^{+}{e}^{\ensuremath{-}}$ collider. The processes ${\ensuremath{\psi}}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{0}$ and ${\ensuremath{\psi}}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\eta}$ are observed for the first time with signal significances of $4.6\ensuremath{\sigma}$ and $4.3\ensuremath{\sigma}$, respectively. The branching fractions …
cn, no, ru, us, ua, it, pk, jp, de, hk
(code pays fourni par la source)