Search for a light pseudoscalar Higgs boson in the boosted µµττ final state in proton-proton collisions at 13 TeV
dc.contributor.author | Sirunyan, A. M. | pt_BR |
dc.contributor.author | Silveira, Gustavo Gil da | pt_BR |
dc.contributor.author | CMS Collaboration | pt_BR |
dc.date.accessioned | 2020-12-11T04:11:55Z | pt_BR |
dc.date.issued | 2020 | pt_BR |
dc.identifier.issn | 1029-8479 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/216405 | pt_BR |
dc.description.abstract | A search for a light pseudoscalar Higgs boson (a) decaying from the 125 GeV (or a heavier) scalar Higgs boson (H) is performed using the 2016 LHC proton-proton collision data at s√ = 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1, collected by the CMS experiment. The analysis considers gluon fusion and vector boson fusion production of the H, followed by the decay H → aa → μμττ, and considers pseudoscalar masses in the range 3.6 < ma < 21 GeV. Because of the large mass difference between the H and the a bosons and the small masses of the a boson decay products, both the μμ and the ττ pairs have high Lorentz boost and are collimated. The ττ reconstruction efficiency is increased by modifying the standard technique for hadronic τ lepton decay reconstruction to account for a nearby muon. No significant signal is observed. Model-independent limits are set at 95% confidence level, as a function of ma, on the branching fraction (ℬ) for H → aa → μμττ, down to 1.5 (2.0) × 10−4 for mH = 125 (300) GeV. Model-dependent limits on ℬ(H → aa) are set within the context of two Higgs doublets plus singlet models, with the most stringent results obtained for Type-III models. These results extend current LHC searches for heavier a bosons that decay to resolved lepton pairs and provide the first such bounds for an H boson with a mass above 125 GeV. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | The journal of high energy physics. Trieste. No. 8 (Aug. 2020), 139, 44 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Beyond Standard Model | en |
dc.subject | Aceleradores de partículas | pt_BR |
dc.subject | Colisões proton-proton | pt_BR |
dc.subject | Hadron-Hadron scattering (experiments) | en |
dc.subject | Bosons de higgs | pt_BR |
dc.subject | Higgs physics | en |
dc.title | Search for a light pseudoscalar Higgs boson in the boosted µµττ final state in proton-proton collisions at 13 TeV | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001118323 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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