This web page summarizes the blessed results for the measurement of the &psi(2S) production cross section performed using the decay channel &psi(2S) &rarr &mu&mu covering the kinematic range 2 GeV/c &le p_T(&psi(2S)) &le 30 GeV/c for |y| &le 0.6, based upon 1.1fb^-1 of CDF Run II data. The data correspond to an effective integrated luminosity of 954.1 pb^-1. The fraction of prompt &psi(2S) events is separated from the decay of the long-lived b hadrons using the proper decay length distribution in a mass-lifetime joint unbinned maximum likelihood fit.
The results have been approved as of October 18, 2007.

The integrated differential cross section for inclusive &psi(2S) production is measured to be:

• &sigma(ppbar &rarr &psi(2S)X, |y(&psi(2S))| < 0.6, p_T > 2 GeV/c)_1.96 · Br(&psi(2S) &rarr &mu&mu) = 3.14 ± 0.04(stat)^+0.23_-0.22(syst) nb

A complete description of the analysis is available in public note.

The differential cross sections for inclusive, prompt production and the &psi(2S) production from B-Decay are shown below.

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

• Figure 1: The inclusive &psi(2S) differential cross section compared to Run I (.eps) (.gif) (.jpg)
• Figure 2: The prompt &psi(2S) differential cross section compared to Run I (.eps) (.gif) (.jpg)
• Figure 3: The B-Decay &psi(2S) differential cross section compared to Run I (.eps) (.gif) (.jpg)


• Figure 4: The inclusive &psi(2S) differential cross section compared to J/&psi (.eps) (.gif) (.jpg)
• Figure 5: The prompt &psi(2S) differential cross section compared to J/&psi (.eps) (.gif) (.jpg)
• Figure 6: The B-Decay &psi(2S) differential cross section compared to J/&psi (.eps) (.gif) (.jpg)