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Search for doubly charged Higgs boson production in multi-lepton final states using 139 fb-1 of proton-proton collisions at SQUARE ROOTs = 13 TeV with the ATLAS detector

Publikace na Matematicko-fyzikální fakulta |
2023

Tento text není v aktuálním jazyce dostupný. Zobrazuje se verze "en".Abstrakt

A search for pair production of doubly charged

Higgs bosons (H+-+-), each decaying into a pair of prompt, isolated, and highly energetic leptons with the same electric charge, is presented. The search uses a proton-proton collision data sample at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 139 fb-1 recorded by the ATLAS detector during Run 2 of the Large Hadron

Collider (LHC). This analysis focuses on same-charge leptonic decays, H+-+- RIGHTWARDS ARROW

+-

+- where ,

= e,μ, τ, in two-, three-, and four-lepton channels, but only considers final states which include electrons or muons. No evidence of a signal is observed. Corresponding upper limits on the production cross-section of a doubly charged Higgs boson are derived, as a function of its mass m(H+-+-

), at 95% confidence level. Assuming that the branching ratios to each of the possible leptonic final states are equal, B(H+-+- RIGHTWARDS ARROW e+-e+-

) =

B(H+-+- RIGHTWARDS ARROW e+-

μ

+-

) = B(H+-+- RIGHTWARDS ARROW μ

+-

μ

+-

) = B(H+-+- RIGHTWARDS ARROW e+-

τ

+-

) = B(H+-+- RIGHTWARDS ARROW μ

+-

τ

+-

) = B(H+-+- RIGHTWARDS ARROW τ

+-

τ

+-

) = 1/6, the observed (expected) lower limit on the mass of a doubly charged Higgs boson is 1080GeV(1065 GeV) within the leftright symmetric type-II seesaw model, which is the strongest limit to date produced by the ATLAS Collaboration. Additionally, this paper provides the first direct test of the Zee-

Babu neutrino mass model at the LHC, yielding an observed

(expected) lower limit of m(H+-+-

) = 900 GeV (880 GeV).