## Cite this, would you please ?September 25, 2008

Posted by dorigo in news, personal, physics, science.
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The energy measurement of jets produced by b quarks at hadron colliders suffers from biases due to the peculiarities of the hadronization and decay of the originating B hadron. The impact of these effects can be estimated by reconstructing the mass of Z boson decays into pairs of b-quark jets. From a sample of $584 pb^{-1}$ of data collected by the CDF experiment in 1.96 TeV proton-antiproton collisions at the Tevatron collider, we show how the Z signal can be identified and measured. Using the reconstructed mass of Z candidates we determine the energy calibration of b-quark jets with a precision better than 2%. This measurement allows a reduction of one of the dominant sources of uncertainty in analyses based on high transverse momentum b-quark jets. We also determine, as a cross-check of our analysis, the Z boson cross-section in hadronic collisions using the b-antib final state as $\sigma_Z \times B(Z \to b \bar b) = 1.58^{+0.64}_{-0.41} nb$.