b-bbar production and correlation

Measurement of the correlated b-bbar production in p-pbar collisions at 1960 GeV

We present a measurement of the correlated bb production cross section. The data used in this analysis were taken with the upgraded CDF (CDF II) detector at the Fermilab Tevatron collider, and correspond to an integrated luminosity of 742 pb^-1. We utilize muon pairs with invariant mass 5 &le m_&mu&mu &le 80 GeV/c² produced by bb double semileptonic decays. For muons with p_T &ge 3 GeV/c and |&eta| &le 0.7, which in turn are produced by b and b quarks with p_T &ge 2 GeV/c and |y| &le 1.3, we measure &sigma_{b&rarr&mu, b&rarr&mu} = 1549 ± 133 pb. We compare this result with theoretical predictions and previous measurements. We also report the measurement of &sigma_{c&rarr&mu, c&rarr&mu}, a by-product of the study of the background to bb production.

The results have been approved as of May 24, 2007.

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

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

Figure : 1D impact parameter templates (.eps) (.gif)
Figure : m_&mu&mu in the Upsilon region (.eps) (.gif)
Figure : 1D projection of some 2D templates used in the fit (.eps) (.gif)
Figure : 2D impact parameter distribution of &mu&mu pairs (.eps) (.gif)
Figure : m_&mu&mu for all &mu&mu pairs used in this study (.eps) (.gif)
Figure : 1D projection of the 2D impact parameter fit (B/W) (.eps) (.gif)
Figure : Impact parameter distributions of kaons and pions from (a) b- and (b) c-quark decays
are compared to those of muons from semileptonic decays (MC). (.eps) (.gif)
Figure : 1D projection of the 2D impact parameter fit (.eps) (.gif)
Figure : Pulls of the 2D fit (.eps) (.gif)
Figure : p_T data vs MC (bb) (.eps) (.gif)
Figure : p_T data vs MC (cc) (.eps) (.gif)
Figure : &delta&phi_&mu&mu data vs MC (bb) (.eps) (.gif)
Figure : &delta&phi_&mu&mu data vs MC (cc) (.eps) (.gif)
Figure : m_&mu&mu data vs MC (bb) (.eps) (.gif)
Figure : m_&mu&mu data vs MC (cc) (.eps) (.gif)
Figure : prompt muons p_T (data) (.eps) (.gif)
Figure : p_T bb vs cc (MC) (.eps) (.gif)
Figure : m_&mu&mu prompt sPlot (Upsilons zoom) (.eps) (.gif)
Figure : distribution of the event vertex along the beamline (.eps) (.gif)
Figure : D⁰ candidates (.eps) (.gif)
Figure : D^* candidates (.eps) (.gif)
Figure : D⁰ candidates with fake &mu from K (.eps) (.gif)
Figure : D⁰ candidates with fake &mu from &pi (.eps) (.gif)
Figure : D⁰ candidates with fake &mu from K (&chi²_CMU>9) (.eps) (.gif)
Figure : D⁰ candidates with fake &mu from K (&chi²_CMU< 9) (.eps) (.gif)
Figure : D⁰ candidates with fake &mu from &pi (&chi²_CMU>9) (.eps) (.gif)
Figure : D⁰ candidates with fake &mu from &pi (&chi²_CMU< 9) (.eps) (.gif)
Figure : &mu from K fake rate vs p_T (.eps) (.gif)
Figure : &mu from &pi fake rate vs p_T (.eps) (.gif)
Figure : p_T of K that can fake a &mu (data vs MC) (.eps) (.gif)
Figure : p_T of &pi that can fake a &mu (data vs MC) (.eps) (.gif)
Figure : efficiency for a real &mu to pass the &chi²_CMU< 9 cut (.eps) (.gif)
Figure : Silicon selection efficiency for 1^st leg (.eps) (.gif)
Figure : Silicon selection efficiency for 2^nd leg (.eps) (.gif)
Figure : CMUP selection efficiency (.eps) (.gif)
Figure : L1 trigger primitive efficiency (.eps) (.gif)