Measurement of the relative cross sections of χc1 and χc2 .

This web page summarizes the results for the measurement of σ(χc2)/σ(χc1) performed using the decay channel χc → J/ψ γ, based upon 1.1 fb-1 of data.
The results have been approved as of June 15, 2006.

We measure:

The ratio is calculated using the PDG 2005 branching fractions for the χc2 and χc1.  The uncertainty labelled "B.F." is due to the uncertainty on those branching fractions.

A more detailed summary of the results can be found here: ps.

Below are the eps and gif versions of all figures meant for downloads.