Search for new phenomena in multi-body invariant masses in events with at least one isolated lepton and two jets using $\sqrt{s} = 13$ TeV proton-proton collision data collected by the ATLAS detector

ATLAS Collaboration

Preprint

PUBDB-2022-07191

Search for new phenomena in multi-body invariant masses in events with at least one isolated lepton and two jets using $\sqrt{s} = 13$ TeV proton-proton collision data collected by the ATLAS detector

ATLAS Collaboration (Collaboration author)DESY*

2022

[10.3204/PUBDB-2022-07191]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-07191

Report No.: CERN-EP-2022-179; arXiv:2211.08945

Abstract: A search for resonances in events with at least one isolated lepton ($e$ or $\mu$) and two jets is performed using $139 \, {\text{fb}}^{-1}$ of $\sqrt{s}=13$ TeV proton-proton collision data recorded by the ATLAS detector at the LHC. Deviations from a smoothly falling background hypothesis are tested in three- and four-body invariant mass distributions constructed from leptons and jets, including jets identified as originating from bottom quarks. Model-independent limits on generic resonances characterised by cascade decays of particles leading to multiple jets and leptons in the final state are presented. The limits are calculated using Gaussian shapes with different widths for the invariant masses. The multi-body invariant masses are also used to set 95% confidence level upper limits on the cross-section times branching ratios for the production and subsequent decay of resonances predicted by several new physics scenarios

Keyword(s): p p, scattering ; width, difference ; resonance, decay ; lepton ; ATLAS ; TeV ; new physics ; branching ratio ; cascade decay ; quark ; mass spectrum ; CERN LHC Coll ; background

Note: 23 pages in total, no author list, 8 figures, 0 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2020-15

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