Production of $\chi_{c1}$ and $\chi_{c2}$ in $p\bar{p}$ Collisions at $\sqrt{s} = 1.8$ TeV

We have measured the ratio of prompt production rates of the charmonium states χc1 and χc2 in 110pb−1 of pp¯ collisions at s=1.8TeV. The photon from their decay into J/ψγ is reconstructed through conversion into e+e− pairs. The energy resolution this technique provides makes the resolution of the two states possible. We find the ratio of production cross sections σχc2σχc1=0.96±0.27(stat)±0.11(syst) for events with pT(J/ψ)>4.0GeV/c, |η(J/ψ)|<0.6, and pT(γ)>1.0GeV/c.

anti-p p: colliding beams
anti-p p: inclusive reaction
chi/c1(3510): hadroproduction
chi/c2(3555): hadroproduction
channel cross section: ratio
chi mesons: radiative decay
mass spectrum: (J/psi(3100) photon)
decay: length
CDF
experimental results

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