Physics / Fizik
Permanent URI for this collectionhttps://hdl.handle.net/11147/6
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Article Citation - WoS: 4Citation - Scopus: 4Tevatron Higgs Mass Bounds: Projecting U(1)' Models To Lhc Domain(Elsevier Ltd., 2010) Sert, Hale; Cincioğlu, Elif; Demir, Durmuş Ali; Solmaz, LeventWe 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: 2Citation - Scopus: 2Muon Anomalous Magnetic Moment Constraints on Supersymmetric U(1)?? Models(American Physical Society, 2010) Cincioğlu, Elif; Kırca, Zerrin; Sert, Hale; Solmaz, Saime; Solmaz, Levent; Hiçyılmaz, YaşarWe study the anomalous magnetic moment of the muon in supersymmetric E 6 models and generic U(1)′ models to probe the model reactions and to find constraints on the large parameter space of these models. For future searches, by imposing the existing bounds coming from collider searches and theoretical considerations upon the U(1)′ model parameters, we examine the lightest Higgs boson mass mh and the mass of the additional Z boson mZ2 in such singlet extensions of the MSSM. We observed that not only supersymmetric E6 models but also generic U(1)′ models are sensitive to the imposition of the considered bounds. Indeed, without the muon anomaly constraints E6 models and generic U(1)′ models can predict mh as large as ∼150GeV and ∼180GeV, respectively. However, in addition to the mentioned constraints when a 1σ range for the anomalous magnetic moment of the muon is considered, we observe that generic U(1)′ models do not favor the mass of the lightest Higgs boson to be larger than 140 GeV; it should be smaller than 135 GeV in E6 models. © 2010 The American Physical SocietyArticle Citation - WoS: 13Citation - Scopus: 13Higgs Boson Masses in the Mssm With General Soft Breaking(Elsevier Ltd., 2008) Sabancı, Aslı; Hayreter, Alper; Solmaz, LeventThe operators that break supersymmetry can be holomorphic or non-holomorphic in structure. The latter do not pose any problem for gauge hierarchy and are soft provided that the particle spectrum does not contain any gauge singlets. In minimal supersymmetric model (MSSM) we discuss the impact of non-holomorphic soft-breaking terms on the Higgs sector. We find that non-holomorphic operators can cause significant changes as are best exhibited by the correlation between the masses of the charginos and Higgs bosonsArticle Citation - WoS: 14Citation - Scopus: 15Cern Lep Indications for Two Light Higgs Bosons and the U(1)' Model(American Physical Society, 2006) Demir, Durmuş Ali; Solmaz, Levent; Solmaz, SaimeReanalyses 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.Article Citation - WoS: 3Citation - Scopus: 3Electric Dipole Moments in U(1)' Models(American Physical Society, 2008) Hayreter, Alper; Sabancı, Aslı; Solmaz, Levent; Solmaz, SaimeWe study electric dipole moments of electrons and protons in E(6)-inspired supersymmetric models with an extra U(1) invariance. Compared to the Minimal Supersymmetric Standard Model, in addition to offering a natural solution to the μ problem and predicting a larger mass for the lightest Higgs boson, these models are found to yield suppressed electric dipole moments. © 2008 The American Physical Society.Article Citation - WoS: 12Citation - Scopus: 12Phenomenological Issues in Supersymmetry With Nonholomorphic Soft Breaking(American Physical Society, 2005) Çakır, Muammer Altan; Mutlu, Sevdiye; Solmaz, LeventWe present a through discussion of motivations for and phenomenological issues in supersymmetric models with minimal matter content and nonholomorphic soft-breaking terms. Using the unification of the gauge couplings and assuming SUSY is broken with nonstandard soft terms, we provide semianalytic solutions of the RGEs for low and high choices of tan β which can be used to study the phenomenology in detail. We also present a generic form of RGIs in mSUGRA framework which can be used to derive new relations in addition to those existing in the literature. Our results are mostly presented with respect to the conventional minimal supersymmetric model for ease of comparison.