CDF b-tagging: Measuring efficiency and false positive rate
The CDF experiment has developed several high p{sub T} b-jet identification tools for the Run II physics program at the Tevatron. Herein we describe in detail one such b-tagging tool that exploits the long- lifetime of the b quark by identifying decay vertices significantly displaced from the primary interaction point. The b-tag efficiency is extracted from a b enriched data sample; the method is described, including a discussion of the important systematic effects. The data-driven measurement of the false positive tag rate is also described, as well as an explanation of how the per-jet false positive rate is used to predict the background contribution to the selected sample. Finally we conclude with a discussion of issues that have proven critical for b-tagging at CDF and should be given attention as we prepare b-tagging tools for LHC experiments.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 892301
- Report Number(s):
- FERMILAB-CONF-06-162-E; TRN: US0701358
- Resource Relation:
- Conference: Presented at TOP 2006: International Workshop on Top Quark Physics, Coimbra, Portugal, 12-15 Jan 2006
- Country of Publication:
- United States
- Language:
- English
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