Identification and rejection of pile-up jets at high pseudorapidity with the ATLAS detector

Abstract

The rejection of forward jets originating from additional proton--proton interactions (pile-up) is crucial for a variety of physics analyses at the LHC, including Standard Model measurements and searches for physics beyond the Standard Model. The identification of such jets is challenging due to the lack of track and vertex information in the pseudorapidity range $|\eta |>2.5$. This paper presents a novel strategy for forward pile-up jet tagging that exploits jet shapes and topological jet correlations in pile-up interactions. Measurements of the per-jet tagging efficiency are presented using a data set of 3.2 $f{b}^{-1}$ of proton--proton collisions at a centre-of-mass energy of 13 TeV collected with the ATLAS detector. The fraction of pile-up jets rejected in the range $2.5<|\eta |<4.5$ is estimated in simulated events with an average of 22 interactions per bunch-crossing. It increases with jet transverse momentum and, for jets with transverse momentum between 20 and 50 GeV, it ranges between 49% and 67% with an efficiency of 85% for selecting hard-scatter jets. A case study is performed in Higgs boson production via the vector-boson fusion process, showing that these techniques mitigate the background growth due to additional proton--proton interactions, thus enhancing the reach for such signatures.

arXiv comment49 pages in total, author list starting page 33, 20 figures, 0 tables, submitted to EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/PERF-2016-06/

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• Evidence of off-shell Higgs boson production from $ZZ$ leptonic decay channels and constraints on its total width with the ATLAS detector
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• Observation of $W\gamma \gamma$ triboson production in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Semi-supervised Graph Neural Networks for Pileup Noise Removal
• Search for dark matter produced in association with a single top quark and an energetic $W$ boson in $\sqrt{s}=$ 13 TeV $pp$ collisions with the ATLAS detector
• Measurements of jet cross-section ratios in 13 TeV proton--proton collisions with ATLAS
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• Test of $CP$ Invariance in Higgs Boson Vector-Boson-Fusion Production Using the $H\to \gamma \gamma$ Channel with the ATLAS Detector
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• Studies of the energy dependence of diboson polarization fractions and the Radiation Amplitude Zero effect in WZ production with the ATLAS detector
• Measurement of the Z boson invisible width at $\sqrt{s}=13$ TeV with the ATLAS detector
• Measurement of the $VH,H\to \tau \tau$ process with the ATLAS detector at 13 TeV
• Constraining off-shell Higgs boson production and the Higgs boson total width using $WW\to \ell \nu \ell \nu$ final states with the ATLAS detector
• Universal Decomposition of Phase-Space Integrands
• Enhancing di-jet resonance searches via a final-state radiation jet tagging algorithm
• Variational inference for pile-up removal at hadron colliders with diffusion models