Measurement of the Resonance Parameters of the ${\chi }_1(1^3{P}_1)$ and ${\chi }_2(1^3{P}_2)$ States of Charmonium formed in Antiproton-Proton Annihilations

Abstract

We have studied the ${}^3{P}_J$ (${\chi }_c)$ states of charmonium in formation by antiproton-proton annihilations in experiment E835 at the Fermilab Antiproton Source. We report new measurements of the mass, width, and $B({\chi }_{cJ}\to \bar{p}p)\times \Gamma ({\chi }_{cJ}\to J/\psi +anything)$ for the ${\chi }_{c1}$ and ${\chi }_{c2}$ by means of the inclusive reaction $\bar{p}p\to {\chi }_{cJ}\to J/\psi +anything\to (e^{+}{e}^{-})+anything$. Using the subsample of events where ${\chi }_{cJ}\to \gamma +J/\psi \to \gamma +(e^{+}{e}^{-})$ is fully reconstructed, we derive $B({\chi }_{cJ}\to \bar{p}p)\times \Gamma ({\chi }_{cJ}\to J/\psi +\gamma )$. We summarize the results of the E760 (updated) and E835 measurements of mass, width and $B({\chi }_{cJ}\to \bar{p}p)\Gamma ({\chi }_{cJ}\to J/\psi +\gamma )$ (J=0,1,2) and discuss the significance of these measurements.

References in corpus (1)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)

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• Physics Accomplishments and Future Prospects of the BES Experiments at the BEPC Collider
• Two Photon Width of chi_{c2}
• Study of $B_c^{+}\to {\chi }_c{\pi }^{+}$ decays
• CLEO Spectroscopy Results
• Precise Measurement of the ${\chi }_{c0}$ Resonance Parameters and Branching Fractions of ${\chi }_{c0,c2}\to {\pi }^{+}{\pi }^{-}/K^{+}{K}^{-}$