Search for supersymmetry in final states with missing transverse momentum and charm-tagged jets using 139 fb${}^{-1}$ of proton-proton collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector

Abstract

The paper presents a search for supersymmetric particles produced in proton-proton collisions at $\sqrt{s}=$ 13 TeV and decaying into final states with missing transverse momentum and jets originating from charm quarks. The data were taken with the ATLAS detector at the Large Hadron Collider at CERN from 2015 to 2018 and correspond to an integrated luminosity of 139 fb${}^{-1}$. No significant excess of events over the expected Standard Model background expectation is observed in optimized signal regions, and limits are set on the production cross-sections of the supersymmetric particles. Pair production of charm squarks or top squarks, each decaying into a charm quark and the lightest supersymmetric particle ${\tilde{\chi }}_1^0$, is excluded at 95% confidence level for squarks with masses up to 900 GeV for scenarios where the mass of ${\tilde{\chi }}_1^0$ is below 50 GeV. Additionally, the production of leptoquarks with masses up to 900 GeV is excluded for the scenario where up-type leptoquarks decay into a charm quark and a neutrino. Model-independent limits on cross-sections and event yields for processes beyond the Standard Model are also reported.

53 pages in total, author list starting page 36, 11 figures, 10 tables, published on JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2018-25

References in corpus (12)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Event generation with SHERPA 1.1
• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• Next-to-next-to-leading-order collinear and soft gluon corrections for t-channel single top quark production
• NNLL resummation for s-channel single top quark production
• Evaluation of three methods for calculating statistical significance when incorporating a systematic uncertainty into a test of the background-only hypothesis for a Poisson process
• The Leptoquark Hunter's Guide: Pair Production
• NNLL-fast: predictions for coloured supersymmetric particle production at the LHC with threshold and Coulomb resummation
• High-pT Signatures in Vector-Leptoquark Models
• Light non-degenerate squarks at the LHC
• Recursive Jigsaw Reconstruction: HEP event analysis in the presence of kinematic and combinatoric ambiguities