A search for the dimuon decay of the Standard Model Higgs boson with the ATLAS detector

Research output: Contribution to journalArticlepeer-review


Colleges, School and Institutes


A search for the dimuon decay of the Standard Model (SM) Higgs boson is performed using data corresponding to an integrated luminosity of 139 fb−1 collected with the ATLAS detector in Run 2 pp collisions at √s=13 TeV at the Large Hadron Collider. The observed (expected) significance over the background-only hypothesis for a Higgs boson with a mass of 125.09 GeV is 2.0 σ (1.7 σ ). The observed upper limit on the cross section times branching ratio for pp→H→μμ is 2.2 times the SM prediction at 95% confidence level, while the expected limit on a H→μμ signal assuming the absence (presence) of a SM signal is 1.1 (2.0). The best-fit value of the signal strength parameter, defined as the ratio of the observed signal yield to the one expected in the SM, is μ=1.2±0.6 .

Bibliographic note

44 pages in total, author list starting page 28, 2 figures, 3 tables, Published by Phys. Lett. B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2019-14


Original languageEnglish
Article number135980
Number of pages24
JournalPhys. Lett. B
Early online date3 Dec 2020
Publication statusPublished - 10 Jan 2021