Abstract

In the harsh environment of the Large Hadron Collider at CERN (design luminosity of 1034 cm−2 s−1) efficient reconstruction of vertices is crucial for many physics analyses. Described in this paper are the strategies for vertex reconstruction used in the ATLAS experiment and their implementation in the software framework Athena. The algorithms for the reconstruction of primary and secondary vertices as well as for finding of photon conversions and vertex reconstruction in jets are described. A special emphasis is made on the vertex fitting with application of additional constraints. The implementation of mentioned algorithms follows a very modular design based on object-oriented C++ and use of abstract interfaces. The user-friendly concept allows event reconstruction and physics analyses to compare and optimize their choice among different vertex reconstruction strategies. The performance of implemented algorithms has been studied on a variety of Monte Carlo samples and results are presented.

Highlights

  • T HIS paper describes vertex reconstruction in the ATLAS Experiment at the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN), Geneva, Switzerland

  • This is achieved by using a common Event Data Model and common abstract interfaces based on object oriented C++

  • 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 b-jet efficiency for b-tagging is given. All these vertex topologies are handled by one single modular software environment

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Summary

INTRODUCTION

T HIS paper describes vertex reconstruction in the ATLAS Experiment at the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN), Geneva, Switzerland. It presents the modular design of the software for vertex reconstruction and properties of its concrete applications. The performance is demonstrated on several vertex topologies such as primary vertex finding, reconstruction of conversions and long-lived particles, constrained vertex fitting and vertex finding in jets

THE ATLAS DETECTOR
VERTEX TOPOLOGIES
SOFTWARE FRAMEWORK
Event Data Model
Interfaces
RECONSTRUCTION OF PRIMARY VERTICES
VERTEX RECONSTRUCTION WITH KINEMATIC CONSTRAINTS
RECONSTRUCTION OF CONVERTED PHOTONS AND LONG-LIVED NEUTRAL PARTICLES
VIII. RECONSTRUCTION OF VERTICES IN JETS
Findings
SUMMARY
Full Text
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