This web page summarizes the results for the measurement of the H_b cross section using the decays H_b → &mu D⁰, D⁰ → &pi K and H_b → &mu D^*+, D^*+ →D⁰ &pi⁺_s, D⁰ → &pi K based upon 83 pb^-1 of data. Here, H_b is an admixture of b hadrons.
The results have been approved as of October 25, 2006.

For H_b with p_T > 9.0 GeV/c and |y| < 0.6, we measure:

• &sigma(pp→H_b) × BR(H_b→&mu^- D⁰ X) × BR(D⁰→&pi⁺K^- ) = 3.53 nb ± 0.20 nb (stat.) +0.34 -0.36 (syst.) nb
• &sigma(pp→H_b) × BR(H_b→&mu^- D^*+ X) × BR(D^*+→D⁰&pi⁺ )× BR(D⁰→&pi⁺K^- ) = 1.04 nb ± 0.13 nb (stat.) +0.12 -0.14 (syst.) nb

• &sigma(pp→H_b) = 1.34 μb ± 0.08 μb (stat.) +0.13 -0.14 (syst.) μb ± 0.07 μb (BR) (from D⁰)
• &sigma(pp→H_b) = 1.47 μb ± 0.18 μb (stat.) +0.17 -0.19 (syst.) μb ± 0.11 μb (BR) (from D^*+)

&sigma(pp→H_b) = 1.39 μb +0.49 -0.34 μb

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

• Figure 1: &pi⁺K^- mass. The black histogram has q_&mu≠q_&pi and the red histogram has q_&mu=q_&pi (.eps)
• Figure 2: &pi⁺_soft&pi⁺K^- mass - &pi⁺K^- mass. In both histograms, the pion associated with the D⁰ has the opposite charge of the muon. The black histogram has q_&pi⁺soft≠q_&mu and the red histogram has q_&pi⁺soft=q_&mu (.eps)
• Figure 3: H_b cross section times BR(H_b→μD⁰)(.eps)
• Figure 4: H_b cross section from H_b→μD⁰ decays (.eps)


• Figure 5: H_b cross section times BR(H_b→μD^*+) (.eps)
• Figure 6: H_b cross section from H_b→μD^*+ decays (.eps)
• Figure 7: H_b cross section from H_b→μD⁰, H_b→μD^*+, and H_b→J/ψX [2] decays (.eps)
• Figure 8: H_b cross section from H_b→μD⁰, H_b→μD^*+, and H_b→J/ψX [2]decays, with FONLL theory bounds. (.eps)