b-tagging in DELPHI at LEP
The DELPHI Collaboration: J. Abdallah, et al
TL;DR
This paper details the b-tagging method in the DELPHI experiment at LEP, emphasizing impact parameters and secondary vertex information to improve b-hadron identification for physics analyses.
Contribution
It introduces a comprehensive b-tagging approach combining impact parameters and secondary vertex data, enhancing efficiency and background suppression in LEP experiments.
Findings
Impact parameter-based tagging effectively identifies b-hadrons.
Adding secondary vertex mass improves background rejection.
Application to physics analyses demonstrates method reliability.
Abstract
The standard method used for tagging b-hadrons in the DELPHI experiment at the CERN LEP Collider is discussed in detail. The main ingredient of b-tagging is the impact parameters of tracks, which relies mostly on the vertex detector. Additional information, such as the mass of particles associated to a secondary vertex, significantly improves the selection efficiency and the background suppression. The paper describes various discriminating variables used for the tagging and the procedure of their combination. In addition, applications of b-tagging to some physics analyses, which depend crucially on the performance and reliability of b-tagging, are described briefly.
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