Identification and rejection of pile-up jets at high pseudorapidity with the ATLAS detector
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Published version
Author(s)
Type
Journal Article
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 |η| > 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 fb−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 < |η| < 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.
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 |η| > 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 fb−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 < |η| < 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.
Date Issued
2017-09-02
Date Acceptance
2017-07-18
Citation
EUROPEAN PHYSICAL JOURNAL C, 2017, 77 (9)
ISSN
1434-6044
Publisher
SPRINGER
Journal / Book Title
EUROPEAN PHYSICAL JOURNAL C
Volume
77
Issue
9
Copyright Statement
© CERN for the benefit of the ALICE collaboration 2017
Open Access
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Funded by SCOAP3
Open Access
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Funded by SCOAP3
License URL
Subjects
Science & Technology
Physical Sciences
Physics, Particles & Fields
Physics
Publication Status
Published
Article Number
580