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Modelling Z -> tau tau processes in ATLAS with tau-embedded Z -> mu mu data
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2850
2015 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 10, P09018Article in journal (Refereed) Published
Abstract [en]

This paper describes the concept, technical realisation and validation of a largely data-driven method to model events with Z -> tau tau decays. In Z -> mu mu events selected from proton-proton collision data recorded at root s = 8 TeV with the ATLAS experiment at the LHC in 2012, the Z decay muons are replaced by tau leptons from simulated Z -> tau tau decays at the level of reconstructed tracks and calorimeter cells. The tau lepton kinematics are derived from the kinematics of the original muons. Thus, only the well-understood decays of the Z boson and tau leptons as well as the detector response to the tau decay products are obtained from simulation. All other aspects of the event, such as the Z boson and jet kinematics as well as effects from multiple interactions, are given by the actual data. This so-called tau-embedding method is particularly relevant for Higgs boson searches and analyses in tau tau final states, where Z -> tau tau decays constitute a large irreducible background that cannot be obtained directly from data control samples. In this paper, the relevant concepts are discussed based on the implementation used in the ATLAS Standard Model H -> tau tau analysis of the full datataset recorded during 2011 and 2012.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 10, P09018
Keyword [en]
Performance of High Energy Physics Detectors, Simulation methods and programs, Analysis and statistical methods
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-176449DOI: 10.1088/1748-0221/10/09/P09018ISI: 000362421300021Scopus ID: 2-s2.0-84948400644OAI: oai:DiVA.org:kth-176449DiVA: diva2:867019
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note

QC 20151104

Available from: 2015-11-04 Created: 2015-11-04 Last updated: 2017-12-01Bibliographically approved

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Strandberg, Jonas

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