Y. H. Zhan

Observation of a Threshold Enhancement in the π + π − Spectrum in ψ ( 3686 ) → π + π − J / ψ Decays

M. Ablikim, М. Н. Ачасов, P. Adlarson, X. Ai et autres

Based on the (2712.4±14.4)×10^{6} ψ(3686) events collected with the BESIII detector, we present a high-precision study of the π^{+}π^{-} mass spectrum in ψ(3686)→π^{+}π^{-}J/ψ decays. A clear resonancelike structure is observed near the π^{+}π^{-} mass threshold for the first time. A fit with …

ru, se, cn, de, it, pl, mn, us, tr, kr, gb (code pays fourni par la source)

First simultaneous measurement of $Ξ^0$ and $\barΞ^0$ asymmetry parameters in $ψ(3686)$ decay

BESIII Collaboration, M. Ablikim, М. Н. Ачасов, P. Adlarson et autres

The $Ξ^0$ asymmetry parameters are measured using entangled quantum $Ξ^0$-$\barΞ^0$ pairs from a sample of $(448.1 \pm 2.9) \times 10^6$ $ψ(3686)$ events collected with the BESIII detector at BEPCII. The relative phase between the transition amplitudes of the $Ξ^0 \barΞ^0$ helicity states …

Study of the resonance structures in $e^{+}e^{-} \rightarrow π^{+}π^{-}J/ψ$ process

BESIII Collaboration, M. Ablikim, М. Н. Ачасов, P. Adlarson et autres

Using about 23 $\mathrm{fb^{-1}}$ of data collected with the BESIII detector operating at the BEPCII storage ring, a precise measurement of the $e^{+}e^{-} \rightarrow π^{+}π^{-}J/ψ$ Born cross section is performed at center-of-mass energies from 3.7730 to 4.7008 GeV. Two structures, identified as …