First observation of $\psi (2S)\to p\bar{n}{\pi }^{-}+c.c.$

Abstract

Using 14 million $\psi (2S)$ events collected with the Beijing Spectrometer (BESII) at the Beijing Electron-Positron Collider, the branching fractions of $\psi (2S)$ decays to $p\bar{n}{\pi }^{-}$ and $\bar{p}n{\pi }^{+}$ and the branching fractions of the main background channels $\psi (2S)\to p\bar{n}{\pi }^{-}{\pi }^0$, $\psi (2S)\to \gamma {\chi }_{c0}\to \gamma p\bar{n}{\pi }^{-}$, $\psi (2S)\to \gamma {\chi }_{c2}\to \gamma p\bar{n}{\pi }^{-}$, and $\psi (2S)\to \gamma {\chi }_{cJ}\to \gamma p\bar{n}{\pi }^{-}{\pi }^0$ are determined. The contributions of the $N^{\ast }$ resonances in $\psi (2S)\to p\bar{n}{\pi }^{-}+c.c.$ are also discussed.

19 pages, 8 figures, add vertex requirement systematic error

References in corpus (9)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• Observation of an Exotic $S=+1$ Baryon in Exclusive Photoproduction from the Deuteron
• Charmless Final States and S--D-wave mixing in the ${\psi }^{\prime \prime }$
• Measurement of $ep\to e^{{}^{\prime }}p{\pi }^{+}{\pi }^{-}$ and baryon resonance analysis
• BESII Detector Simulation
• Measurement of the final states $\omega {\pi }^0$, $\rho \eta$, and $\rho {\eta }^{{}^{\prime }}$ from $\psip$ electromagnetic decays and $\ee$ annihilations
• Observation of p pbar pi^0 and p pbar eta in psi' decays
• Possible large branching fraction of psi(3770) decays to charmless final states

Cited by in corpus (10)

• Heavy quarkonium: progress, puzzles, and opportunities
• Progress Toward Understanding Baryon Resonances
• Observation of Two New N* Peaks in J/psi -> $pp{i}^{-}\bar{n}$ and $\bar{p}{\pi }^{+}n$ Decays
• Theoretical study on pp --> p n pi+ reaction at medium energies
• Measurement of ${\chi }_{cJ}$ decaying into $p\bar{n}{\pi }^{-}$ and $p\bar{n}{\pi }^{-}{\pi }^0$
• Meson Emission Model of Psi to N Nbar m Charmonium Strong Decays
• Complementary studies on $N^{\ast }$ from $e^{+}{e}^{-}$, $pp$ and $p\bar{p}$ collisions
• First observation of J/ψand ψ(2S) decaying to n K^0_S\barΛ+c.c
• The nucleon resonances in the $J/\psi \to p\bar{p}{\eta }^{\prime }$ decay
• Measurement of the Branching Fraction for J/ψ-> p \bar{p}ηand p \bar{p} η^{'}