Search for a light pseudoscalar Higgs boson in the boosted mu mu tau tau final state in proton-proton collisions at root s=13 TeV

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dc.WoS.categoriesPhysics, Particles & Fieldsen_US
dc.authorid0000-0002-9007-8260en_US
dc.contributor.authorYetkin, Elif Aslı
dc.date.accessioned2020-11-06T10:50:33Z
dc.date.available2020-11-06T10:50:33Z
dc.date.issued2020-08-27
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Enerji Sistemleri Mühendisliği Bölümüen_US
dc.description44 pagesen_US
dc.description.abstractA 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 root 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 -> mu mu tau tau, and considers pseudoscalar masses in the range 3.6 < m(a) < 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 mu mu and the tau tau pairs have high Lorentz boost and are collimated. The tau tau reconstruction efficiency is increased by modifying the standard technique for hadronic tau 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 m(a), on the branching fraction (B) for H -> aa -> mu mu tau tau, down to 1.5 (2.0)x10(-4) for m(H) = 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_US
dc.description.tableofcontents1 Introduction 1 2 The CMS detector 3 3 Data and simulated samples 4 4 Event reconstruction 4 4.1 Muons 5 4.2 Jets 5 4.3 Hadronic lepton decays 5 4.4 Charged lepton e ciency 6 5 Event selection 7 6 Signal and background modeling 7 7 Systematic uncertainties 11 8 Results 15 9 Summary 17en_US
dc.fullTextLevelFull Texten_US
dc.identifier.doi10.1007/JHEP08(2020)139
dc.identifier.issn1029-8479
dc.identifier.scopus2-s2.0-85089987196en_US
dc.identifier.urihttps://hdl.handle.net/11411/2497
dc.identifier.urihttps://doi.org/10.1007/JHEP08(2020)139
dc.identifier.wosWOS:000563451600001en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.issue8en_US
dc.language.isoenen_US
dc.nationalInternationalen_US
dc.numberofauthors1000+en_US
dc.publisherSpringeren_US
dc.relation.ispartofJournal of High Energy Physicsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectHiggs physicsen_US
dc.subjectHadron-Hadron scattering (experiments)en_US
dc.subjectBeyond Standard Modelen_US
dc.titleSearch for a light pseudoscalar Higgs boson in the boosted mu mu tau tau final state in proton-proton collisions at root s=13 TeV
dc.typeArticle

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