How to estimate b-tag efficiency and false positive rate?

Details How to estimate b-tag efficiency and false positive rate? How to estimate b-tag efficiency and false positive rate?

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006wtqp.confe..15n&link_type=abstract

Proceedings of the International Workshop on Top Quark Physics. January 12-15, 2006. Coimbra, Portugal. Editorial board: Antonio

Physics

Scientific paper

The CDF experiment has developed several high pT 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 measure- ment 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.

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