Track Reconstruction and b-Jet Identification for the ATLAS Trigger System

TL;DR

This paper describes the ATLAS trigger system's real-time track reconstruction and b-jet identification, crucial for selecting heavy-flavour quark events during CERN's LHC proton-proton collisions.

Contribution

It presents the implementation and performance of the online b-jet triggers used in ATLAS during the 2011 data-taking campaign.

Findings

Successful real-time track reconstruction and b-jet identification.

Effective selection of heavy-flavour quark events.

Performance estimates validated with data.

Abstract

A sophisticated trigger system, capable of real-time track reconstruction, is used in the ATLAS experiment to select interesting events in the proton-proton collisions at the Large Hadron Collider at CERN. A set of $b$-jet triggers was activated in ATLAS for the entire 2011 data-taking campaign and successfully selected events enriched in jets arising from heavy-flavour quarks. Such triggers were demonstrated to be crucial for the selection of events with no lepton signature and a large jet multiplicity. An overview of the track reconstruction and online $b$-jet selection with performance estimates from data is presented in these proceedings.