Search for dijet resonances in events with an isolated charged lepton using s $$ \sqrt{s} $$ = 13 TeV proton-proton co
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Received: February 27, 2020 Accepted: June 8, 2020 Published: June 25, 2020
The ATLAS collaboration E-mail: [email protected] Abstract: A search for dijet resonances in events with at least one isolated charged lep√ ton is performed using 139 fb−1 of s = 13 TeV proton-proton collision data recorded by the ATLAS detector at the LHC. The dijet invariant-mass (mjj ) distribution constructed from events with at least one isolated electron or muon is searched in the region 0.22 < mjj < 6.3 TeV for excesses above a smoothly falling background from Standard Model processes. Triggering based on the presence of a lepton in the event reduces limitations imposed by minimum transverse momentum thresholds for triggering on jets. This approach allows smaller dijet invariant masses to be probed than in inclusive dijet searches, targeting a variety of new-physics models, for example ones in which a new state is produced in association with a leptonically decaying W or Z boson. No statistically significant deviation from the Standard Model background hypothesis is found. Limits on contributions from generic Gaussian signals with widths ranging from that determined by the detector resolution up to 15% of the resonance mass are obtained for dijet invariant masses ranging from 0.25 TeV to 6 TeV. Limits are set also in the context of several scenarios beyond the Standard Model, such as the Sequential Standard Model, a technicolor model, a charged Higgs boson model and a simplified Dark Matter model. Keywords: Exotics, Hadron-Hadron scattering (experiments) ArXiv ePrint: 2002.11325
Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP06(2020)151
JHEP06(2020)151
Search for dijet resonances in events with an isolated √ charged lepton using s = 13 TeV proton-proton collision data collected by the ATLAS detector
Contents 1
2 ATLAS detector
2
3 Object definitions and event selection
4
4 Monte Carlo simulations
6
5 Analysis procedure
7
6 Systematic uncertainties
10
7 Results 7.1 Limits on BSM models
12 15
8 Conclusion
17
A Dijet invariant mass in the LE-CR region
19
B Expected limits for broad signals
19
The ATLAS collaboration
25
1
Introduction
In the Standard Model (SM), events with two or more jets are usually produced by strong interactions described by quantum chromodynamics (QCD). Searches for resonances in dijet invariant-mass distributions provide a means to investigate a wide range of theories beyond the Standard Model (BSM). Such searches are sensitive to heavy particles that decay into two partons which, following fragmentation, form two jets. Studies of this kind were among the first published using early data from the ATLAS [1–4] and CMS [5–7] experiments at the Large Hadron Collider (LHC) at CERN, when operations at high energy first began. Later results used new datasets as the LHC increased the collision energy, from 7 TeV to 8 TeV during Run 1 [8–10], and then to 13 TeV for Run 2 [11–18]. Typically, thes
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