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Reconstruction and identification of hadronically decaying tau leptons with the ATLAS experiment
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics. (ATLAS)ORCID iD: 0000-0003-0407-0957
2016 (English)In: Reconstruction and identification of hadronically decaying tau leptons with the ATLAS experiment, 2016, Vol. LHCP2016, 211Conference paper, Published paper (Other academic)
Abstract [en]

Tau leptons are important to many physical processes in high-energy physics. They are used for measurements of Standard Model processes, and searches for new physics beyond the Standard Model. With their high mass, tau leptons are prime signatures for e.g. Higgs boson decays to fermions. In these proceedings, the reconstruction and identification algorithms for hadronically decaying tau leptons in Run-2 of the LHC are presented, along with the identification performance in \SI{13}{TeV} data collected in 2015.

Place, publisher, year, edition, pages
2016. Vol. LHCP2016, 211
Series
Proceedings, Fourth Annual Large Hadron Collider Physics (LHCP2016): Lund, Sweden, June 13-18, 2016, 211
Keyword [en]
tau, tau lepton, hadronic decay, atlas
National Category
Subatomic Physics
Research subject
Physics with specialization in Elementary Particle Physics
Identifiers
URN: urn:nbn:se:uu:diva-304287OAI: oai:DiVA.org:uu-304287DiVA: diva2:1015010
Conference
Fourth Annual Large Hadron Collider Physics
Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2016-10-06
In thesis
1. Searches for Higgs bosons with hadronically decaying τ-leptons: Using Grid and Cloud computing techniques
Open this publication in new window or tab >>Searches for Higgs bosons with hadronically decaying τ-leptons: Using Grid and Cloud computing techniques
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes a measurement of the Standard Model Higgs boson coupling to fermions in decays to two τ-leptons, a search for charged Higgs bosons in decays to a τ-lepton and a neutrino, as well as the reconstruction, identification and triggering of hadronically decaying τ-leptons. The data considered are collected by the ATLAS experiment at the Large Hadron Collider.

The reconstruction and identification of hadronically decaying τ-leptons in the ATLAS experiment during Run 2 of the Large Hadron Collider are described, and the performance of the τ trigger is measured in events with top–antitop-quark pairs using data from 13 TeV proton–proton collisions, corresponding to an integrated luminosity of 3.2 fb-1, collected in 2015, and 11.5 fb-1, collected in 2016.

Hadronically decaying τ-leptons are of importance to many physical processes involving Higgs bosons. The coupling of the Standard Model Higgs boson to fermions is measured in decays to two τ-leptons using 7 TeV data corresponding to an integrated luminosity of 4.5 fb-1, collected in 2011, and 8 TeV data corresponding to an integrated luminosity of 20.3 fb-1, collected in 2012. The signal strength is measured to be μ = 1.4, corresponding to an excess over the background-only model of 4.5σ.

Charged Higgs bosons are searched for in decays to a τ-lepton and a neutrino, where the τ-lepton decays hadronically. 13 TeV data corresponding to an integrated luminosity of 14.7 fb-1, collected in 2015 and 2016, are used. No excess over the Standard Model background is observed, and the 95 % confidence-level exclusion limits on σ(pp → [b]tH+) × (H+ → τν) are set to 2.0 pb–8 fb in the range 200–2000 GeV.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 111 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1434
Keyword
LHC, ATLAS, Higgs, Charged Higgs, Tau lepton, 2HDM, MSSM
National Category
Subatomic Physics
Research subject
Physics with specialization in Elementary Particle Physics
Identifiers
urn:nbn:se:uu:diva-304291 (URN)978-91-554-9706-4 (ISBN)
Public defence
2016-11-21, Polhemsalen, 10134, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2016-10-31 Created: 2016-10-03 Last updated: 2016-11-17

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