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Title: Modelling Z→TT processes in ATLAS with T-embedded Z →μμ data

Abstract

We describe the concept, technical realisation and validation of a largely data-driven method to model events with Z→ττ decays. In Z→μμ events selected from proton-proton collision data recorded at √s=8 TeV with the ATLAS experiment at the LHC in 2012, the Z decay muons are replaced by τ leptons from simulated Z →ττ decays at the level of reconstructed tracks and calorimeter cells. The τ lepton kinematics are derived from the kinematics of the original muons. Thus, only the well-understood decays of the Z boson and τ leptons as well as the detector response to the τ 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 τ-embedding method is particularly relevant for Higgs boson searches and analyses in ττ final states, where Z→ττ decays constitute a large irreducible background that cannot be obtained directly from data control samples. In this paper, we discuss the relevant concepts based on the implementation used in the ATLAS Standard Model H→ττ analysis of the full datataset recorded during 2011 and 2012.

Authors:
 [1]
  1. Aix-Marseille Univ., and CNRS/IN2P3, Marseille (France). et al.
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
The ATLAS Collaboration
OSTI Identifier:
1254175
Alternate Identifier(s):
OSTI ID: 1407393
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 10; Journal Issue: 09; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Performance of High Energy Physics Detectors; Simulation methods and programs; Analysis and statistical methods

Citation Formats

Aad, G. Modelling Z→TT processes in ATLAS with T-embedded Z →μμ data. United States: N. p., 2015. Web. doi:10.1088/1748-0221/10/09/p09018.
Aad, G. Modelling Z→TT processes in ATLAS with T-embedded Z →μμ data. United States. doi:10.1088/1748-0221/10/09/p09018.
Aad, G. Tue . "Modelling Z→TT processes in ATLAS with T-embedded Z →μμ data". United States. doi:10.1088/1748-0221/10/09/p09018. https://www.osti.gov/servlets/purl/1254175.
@article{osti_1254175,
title = {Modelling Z→TT processes in ATLAS with T-embedded Z →μμ data},
author = {Aad, G.},
abstractNote = {We describe the concept, technical realisation and validation of a largely data-driven method to model events with Z→ττ decays. In Z→μμ events selected from proton-proton collision data recorded at √s=8 TeV with the ATLAS experiment at the LHC in 2012, the Z decay muons are replaced by τ leptons from simulated Z →ττ decays at the level of reconstructed tracks and calorimeter cells. The τ lepton kinematics are derived from the kinematics of the original muons. Thus, only the well-understood decays of the Z boson and τ leptons as well as the detector response to the τ 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 τ-embedding method is particularly relevant for Higgs boson searches and analyses in ττ final states, where Z→ττ decays constitute a large irreducible background that cannot be obtained directly from data control samples. In this paper, we discuss the relevant concepts based on the implementation used in the ATLAS Standard Model H→ττ analysis of the full datataset recorded during 2011 and 2012.},
doi = {10.1088/1748-0221/10/09/p09018},
journal = {Journal of Instrumentation},
issn = {1748-0221},
number = 09,
volume = 10,
place = {United States},
year = {2015},
month = {9}
}

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