| ATLAS Note | |
| Report number | ATLAS-CONF-2019-001 |
| Title | Search for high-mass dilepton resonances using $139\,\mathrm{fb}^{-1}$ of $pp$ collision data collected at $\sqrt{s}=13\,\mathrm{TeV}$ with the ATLAS detector |
| Corporate Author(s) | The ATLAS collaboration |
| Collaboration | ATLAS Collaboration |
| Publication | 2019 |
| Imprint | 26 Feb 2019 |
| Number of pages | mult. |
| Note | All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2019-001 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; ATLAS |
| Free keywords | dilepton ; dielectron ; dimuon ; Z' ; resonance ; generic ; BSM ; EXOTICS |
| Abstract | A search for high-mass dielectron and dimuon resonances in the mass range of 250$\,$GeV to 6$\,$TeV is presented. The data were recorded by the ATLAS experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}=13\,$TeV during Run 2 of the Large Hadron Collider and correspond to an integrated luminosity of $139\,\mathrm{fb}^{-1}$. A functional form is fitted to the dilepton invariant-mass distribution to model the contribution from background processes, and a generic signal shape is used to determine the significance of observed deviations from this background estimate. No significant deviation is observed and upper limits are placed at the 95% confidence level on the fiducial cross-section times branching ratio for various resonance width hypotheses. The derived limits are shown to be applicable to spin-0, spin-1 and spin-2 signal hypotheses. For a set of benchmark models, the limits are converted into lower limits on the resonance mass and reach 4.5$\,$TeV for the E$_6$-motivated $Z'_{\psi}$ boson. Also presented are limits on Heavy Vector Triplet model couplings. |
Corresponding record in: Inspire
Element opprettet 2019-02-26, sist endret 2021-04-18