Pontificia Universidad Católica de Chile Pontificia Universidad Católica de Chile
Aad G., Abbott B., Abbott D. C., Abud A. A., Abeling K., Abhayasinghe D. K., Abusleme A. (2022)

Search for Higgs boson decays into a pair of pseudoscalar particles in the bb?? final state with the ATLAS detector in pp collisions at ?s=13??TeV

Revista : Physical Review D
Volumen : 105
Número : 1
Tipo de publicación : ISI Ir a publicación


This paper presents a search for decays of the Higgs boson with a mass of 125 GeV into a pair of new pseudoscalar particles, H?aa, where one a-boson decays into a b-quark pair and the other into a muon pair. The search uses 139?fb?1 of proton-proton collision data at a center-of-mass energy of ?s=13 TeV recorded between 2015 and 2018 by the ATLAS experiment at the LHC. A narrow dimuon resonance is searched for in the invariant mass spectrum between 16 GeV and 62 GeV. The largest excess of events above the Standard Model backgrounds is observed at a dimuon invariant mass of 52 GeV and corresponds to a local (global) significance of 3.3?(1.7?). Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to the bb?? final state, B(H?aa?bb??), and are in the range 0.2–4.0×10?4, depending on the signal mass hypothesis.