ATLAS strategy for primary vertex reconstruction during Run-2 of the LHC

G. Borissov, D. Casper, K. Grimm, S. Pagan Griso, L. Egholm Pedersen, K. Prokofiev, M. Rudolph, A. Wharton

Research output: Contribution to journalConference Articlepeer-review

1 Scopus citations


The reconstruction of vertices corresponding to proton-proton collisions in ATLAS is an essential element of event reconstruction used in many performance studies and physics analyses. During Run-1 of the LHC, ATLAS has employed an iterative approach to vertex finding. In order to improve the flexibility of the algorithm and ensure continued performance for very high numbers of simultaneous collisions in Run-2 of the LHC and beyond, a new approach to seeding vertex finding has been developed inspired by image reconstruction techniques. This note provides a brief outline of how reconstructed tracks are used to create an image of likely vertex collisions in an event, describes the implementation in the ATLAS software, and presents some preliminary results of the performance of the algorithm in simulation approximating early Run-2 conditions.

Original languageEnglish (US)
Article number072041
JournalJournal of Physics: Conference Series
Issue number7
StatePublished - 2015
Externally publishedYes
Event21st International Conference on Computing in High Energy and Nuclear Physics, CHEP 2015 - Okinawa, Japan
Duration: Apr 13 2015Apr 17 2015

ASJC Scopus subject areas

  • General Physics and Astronomy


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