CERN Accelerating science

ATLAS Slides
Report number	ATL-PHYS-SLIDE-2012-310
Title	Track and vertex reconstruction in the ATLAS Experiment
Author(s)	Meloni, F (Università degli Studi di Milano & INFN Milano)
Corporate author(s)	The ATLAS collaboration
Submitted to	12th Pisa Meeting on Advanced Detectors: Frontier Detector for Frontier Physics, La Biodola, Isola d'Elba, Italy, 20 - 26 May 2012
Submitted by	[email protected] on 03 Jun 2012
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	TRACKING
Abstract	The track and vertex reconstruction algorithms of the ATLAS Inner Detector have demonstrated excellent performance in the early data from the LHC. However, the rapidly increasing number of interactions per bunch crossing introduces new challenges both in computational aspects and physics performance. The combination of both silicon and gas based detectors provides high precision impact parameter and momentum measurement of charged particles, with high efficiency and small fake rate. Vertex reconstruction is used to identify with high efficiency the hard scattering process and to measure the amount of pile-up interactions, both aspects are crucial for many physics analyses. The performance of track and vertex reconstruction efficiency and resolution achieved in the 2011 data-taking period and perspectives for the 2012 data-taking, were improved algorithms will be used to are presented.