The performance of missing transverse momentum reconstruction and its significance with the ATLAS detector using 140 fb−1 of s√=13 TeV pp collisions

ATLAS Collaboration; Diksha Garg; Usha Mallik

doi:10.48550/arXiv.2402.05858

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The performance of missing transverse momentum reconstruction and its significance with the ATLAS detector using 140 fb−1 of s√=13 TeV pp collisions

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The performance of missing transverse momentum reconstruction and its significance with the ATLAS detector using 140 fb−1 of s√=13 TeV pp collisions

ATLAS Collaboration, Diksha Garg and Usha Mallik

ArXiv.org

Cornell University

02/08/2024

DOI: 10.48550/arXiv.2402.05858

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Preprint (Author's original)This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

This paper presents the reconstruction of missing transverse momentum (pmissT) in proton-proton collisions, at a center-of-mass energy of 13 TeV. This is a challenging task involving many detector inputs, combining fully calibrated electrons, muons, photons, hadronically decaying τ-leptons, hadronic jets, and soft activity from remaining tracks. Possible double counting of momentum is avoided by applying a signal ambiguity resolution procedure which rejects detector inputs that have already been used. Several pmissT `working points' are defined with varying stringency of selections, the tightest improving the resolution at high pile-up by up to 30% compared to the loosest. The pmissT performance is evaluated using data and Monte Carlo simulation, with an emphasis on understanding the impact of pile-up, primarily using events consistent with leptonic Z decays. The studies use 140 fb−1 of data, collected by the ATLAS experiment at the Large Hadron Collider between 2015 and 2018. The results demonstrate that pmissT reconstruction, and its associated significance, are well understood and reliably modelled by simulation. Finally, the systematic uncertainties on the soft pmissT component are calculated. After various improvements the scale and resolution uncertainties are reduced by up to 76% and 51%, respectively, compared to the previous calculation at a lower luminosity.

calibration

CERN LHC Coll

electron

experimental results

GeV-cms

jet: hadronic

muon

numerical calculations: Monte Carlo

p p: colliding beams

p p: scattering

photon

pile-up

resolution

tau: hadronic decay

tracks

transverse momentum: missing-energy

Z0: leptonic decay

Details

Title: Subtitle: The performance of missing transverse momentum reconstruction and its significance with the ATLAS detector using 140 fb−1 of s√=13 TeV pp collisions
Creators: ATLAS Collaboration
Diksha Garg (Contributor)
Usha Mallik (Contributor)
Resource Type: Preprint
Publication Details: ArXiv.org
DOI: 10.48550/arXiv.2402.05858
ISSN: 2331-8422
Publisher: Cornell University
Language: English
Date posted: 02/08/2024
Academic Unit: Physics and Astronomy
Record Identifier: 9984696853602771

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