Study of the P-wave charmonium state χ_{cJ} in ψ(2S) decays
Abstract
Description
The processes $ψ(2S)\to γπ^+ π^-$, $γK^+ K^-$ and $γp \bar{p}$ have been studied using a sample of $3.7 \times 10^6$ produced $ψ(2S)$ decays. We determine the total width of the $χ_{c0}$ to be $Γ^{tot}_{χ_{c0}} = 14.3\pm 2.0\pm 3.0$ MeV. We present the first measurement of the branching fraction $B(χ_{c0} \to p \bar{p}) = (16.3 \pm 4.4 \pm 5.4)\times 10^{-5}$, where the first error is statistical and the second one systematic. Branching fractions of $χ_{c0,2} \to π^+ π^-$ and $K^+ K^-$ are also reported.
10 pages, revtex, 3 figures, 2 tables
10 pages, revtex, 3 figures, 2 tables