Energy calibration of b-quark jets with decays at the Tevatron collider
✍ Scribed by J. Donini; T. Dorigo; K. Hatakeyama; S. Kwang; C. Neu; M. Shochet; T. Tomura; M. Tosi; D. Whiteson
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 633 KB
- Volume
- 596
- Category
- Article
- ISSN
- 0168-9002
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✦ Synopsis
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 À1 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 source 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 b final state as s Z Â BðZ ! b bÞ ¼ 1:58 þ0:64 À0:41 nb.