Physics / Fizik

Permanent URI for this collectionhttps://hdl.handle.net/11147/6

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Author: search.filters.author.Solmaz, LeventInstitution Author: search.filters.institutionAuthor.Demir, Durmuş Ali

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  • Article
    Citation - WoS: 4
    Citation - Scopus: 4
    Tevatron Higgs Mass Bounds: Projecting U(1)' Models To Lhc Domain
    (Elsevier Ltd., 2010) Sert, Hale; Cincioğlu, Elif; Demir, Durmuş Ali; Solmaz, Levent
    We study Higgs boson masses in supersymmetric models with an extra U(1) symmetry to be called U(1)′. Such extra gauge symmetries are urged by the Μ problem of the MSSM, and they also arise frequently in low-energy supersymmetric models stemming from GUTs and strings.We analyze mass of the lightest Higgs boson and various other particle masses and couplings by taking into account the LEP bounds as well as the recent bounds from Tevatron experiments. We find that the Μ-problem motivated generic low-energy U(1)′ model yields Higgs masses as large as ~200 GeV and violate the Tevatron bounds for certain ranges of parameters. We analyze correlations among various model parameters, and determine excluded regions by both scanning the parameter space and by examining certain likely parameter values. We also make educated projections for LHC measurements in light of the Tevatron restrictions on the parameter space.We further analyze certain benchmark models stemming from E(6) breaking, and find that they elevate Higgs boson mass into Tevatron's forbidden band when U(1)′ gauge coupling takes larger values than the one corresponding to one-step GUT breaking. © 2010 Elsevier B.V.
  • Article
    Citation - WoS: 14
    Citation - Scopus: 15
    Cern Lep Indications for Two Light Higgs Bosons and the U(1)' Model
    (American Physical Society, 2006) Demir, Durmuş Ali; Solmaz, Levent; Solmaz, Saime
    Reanalyses of LEP data have shown preference to two light CP-even Higgs bosons. We discuss implications of such a Higgs boson spectrum for the minimal supersymmetric model extended by a standard model singlet chiral superfield and an additional Abelian gauge invariance [the U(1)′ model]. We, in particular, determine parameter regions that lead to two light CP-even Higgs bosons while satisfying existing bounds on the mass and mixings of the extra vector boson. In these parameter regions, the pseudoscalar Higgs is found to be nearly degenerate in mass with either the lightest or next-to-lightest Higgs boson. Certain parameters of the U(1)′ model such as the effective μ parameter are found to be significantly bounded by the LEP two light Higgs signal.