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Performance of algorithms that reconstruct missing transverse momentum in √s = 8 TeV proton–proton collisions in the ATLAS detector

Barton, Adam Edward and Beattie, Michael and Borissov, Guennadi and Bouhova-Thacker, Evelina Vassileva and Cheatham, Sue and Dearnaley, William and Fox, Harald and Grimm, Kathryn Ann Tschann and Henderson, Robert Charles William and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Muenstermann, Daniel Matthias Alfred and Skinner, Malcolm and Smizanska, Maria and Walder, James William and Wharton, Andy (2017) Performance of algorithms that reconstruct missing transverse momentum in √s = 8 TeV proton–proton collisions in the ATLAS detector. European Physical Journal C: Particles and Fields, 77 (4). ISSN 1434-6044

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The reconstruction and calibration algorithms used to calculate missing transverse momentum (Emiss T ) with the ATLAS detector exploit energy deposits in the calorimeter and tracks reconstructed in the inner detector as well as the muon spectrometer. Various strategies are used to suppress effects arising from additional proton–proton interactions, called pileup, concurrent with the hard-scatter processes. Tracking information is used to distinguish contributions from the pileup interactions using their vertex separation along the beam axis. The performance of the Emiss T reconstruction algorithms, especially with respect to the amount of pileup, is evaluated using data collected in proton–proton collisions at a centre-of-mass energy of 8 TeV during 2012, and results are shown for a data sample corresponding to an integrated luminosity of 20.3 fb−1. The simulation and modelling of Emiss T in events containing a Z boson decaying to two charged leptons (electrons or muons) or a W boson decaying to a charged lepton and a neutrino are compared to data. The acceptance for different event topologies, with and without high transverse momentum neutrinos, is shown for a range of threshold criteria for Emiss T , and estimates of the systematic uncertainties in the Emiss T measurements are presented.

Item Type: Journal Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Departments: Faculty of Science and Technology > Physics
ID Code: 86895
Deposited By: ep_importer_pure
Deposited On: 30 Jun 2017 12:20
Refereed?: Yes
Published?: Published
Last Modified: 21 Mar 2018 02:27
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