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| Author | : Jinsong Wang |
| Publisher | : |
| Total Pages | : 198 |
| Release | : 1994 |
| Genre | : Higgs bosons |
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| Author | : Colin Philip Jessop |
| Publisher | : |
| Total Pages | : 298 |
| Release | : 1993 |
| Genre | : Higgs bosons |
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| Release | : 2000 |
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The Standard Model predicts the existence of one neutral scalar Higgs boson, which is a remnant of the mechanism that breaks the SU(2)[sub L]xU(1)[sub Y] electroweak symmetry and generates masses for the heavy vector bosons and fermions. Many extensions to the Standard Model predict two or more Higgs doublets, resulting in a larger spectrum of Higgs bosons including a charged Higgs boson (H[sup [+-]]). For a light charged Higgs boson mass, the top decay into a charged Higgs boson and bottom quark might occur. This thesis presents results of a direct search for this top quark decay mode via the charged Higgs decay to a tau lepton and tau-neutrino, using the hadronic decays of the tau leptons. The search data consist of 100 pb[sup -1] of Run 1 data collected between 1992-1995 at the CDF detector, from p[anti p] collisions at a center-of-mass energy of 1.8 TeV produced at Fermilab's Tevatron accelerator. A total of seven events are observed in two search channels with an expected background contribution of 7.4[+-]2.0 events coming from fake taus (5.4[+-]1.5), heavy vector boson decays with jets (1.9[+-]1.3) and dibosons(0.08[+-]0.06). Lacking evidence for a signal, we set limits on charged Higgs production at the 95% confidence level in the charged Higgs mass plane versus tan[beta](a parameter of the theory) for a top quark mass of 175 GeV/c[sup 2] and for top production cross sections ([sigma][sub t[anti t]]) of 5.0 and 7.5 pb, assuming the Type-II Two-Higgs-Doublet-Model. For large tan[beta], this analysis excludes a charged Higgs boson of mass below 147(158)GeV/c[sup 2] for [sigma][sub t[anti t]]=5.0(7.5)pb. Using the Standard Model measured top quark cross section from CDF, this limit increases to 168 GeV/c[sup 2] and we also exclude a branching fraction of top decays via this charged Higgs mode of greater than 43% for charged Higgs masses below 168 GeV/c[sup 2].
| Author | : Leslie Stevan Groer |
| Publisher | : |
| Total Pages | : 598 |
| Release | : 1998 |
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| Author | : Geum Bong Yu |
| Publisher | : |
| Total Pages | : 364 |
| Release | : 2009 |
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| Total Pages | : 110 |
| Release | : 1994 |
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This paper presents the results of a search in $\bar{p}$ collisions at √s = 1.8 TeV for the toop quark decaying to a charged Higgs boson (H±).
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| Total Pages | : 110 |
| Release | : 1994 |
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| Release | : 2005 |
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We present results of a search for the top quark decaying to a charged. Higgs boson (H) in p[bar p] collisions at [radical]s = 1.8 TeV at the Fermilab Tevatron. Using 4.1 pb[sup [minus]1] of data collected during the 1988--1989 CDF run, we have searched for evidence of t[bar t] production assuming that t[r-arrow] Hb and H[r-arrow] [tau][nu][sub [tau]]. We find no evidence for this decay and are able to exclude regions in the (m[sub t], m[sub H]) plane for different Br(H[r-arrow] [tau][nu][sub [tau]]). We also interpret these results for the two Higgs doublet(THD) model.
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| Total Pages | : 13 |
| Release | : 1993 |
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We present results of a search for the top quark decaying to a charged. Higgs boson (H) in p{bar p} collisions at √s = 1.8 TeV at the Fermilab Tevatron. Using 4.1 pb−1 of data collected during the 1988--1989 CDF run, we have searched for evidence of t{bar t} production assuming that t→ Hb and H→??{sub?}. We find no evidence for this decay and are able to exclude regions in the (m{sub t}, m{sub H}) plane for different Br(H→ {tau}?{sub {tau}}). We also interpret these results for the two Higgs doublet(THD) model.
| Author | : Blake Burghgrave |
| Publisher | : |
| Total Pages | : 105 |
| Release | : 2018 |
| Genre | : Nuclear physics |
| ISBN | : 9780438392144 |
This dissertation describes a search for charged Higgs bosons decaying to a tau and a neutrino (H+ [right arrow] [tau]+[nu][sub t] or the charge-conjugate process) in association with a leptonically decaying top quark, using 36.1 fb−1 of pp collision data collected with [square root]s = 13 TeV by the ATLAS detector. The theoretical motivation, including a review of the Standard Model, is given, along with a description of the ATLAS detector and particle reconstruction. A multi-variate analysis approach uses stochastic gradient boosted decision trees to improve the separation between H^[+/-] signal and background. The semi-leptonic channel described in this thesis is used in combination with a fully hadronic channel to search for charged Higgs bosons in a mass range of 90 GeV [less than or equal to] m[sub H^[+/-]] [less than or equal to] 2000 GeV. Finding no significant excess, limits are set at the 95% confidence level on the charged Higgs production cross section times the branching fraction into [tau][nu] ranging from 4.2 pb to 2.5 fb. These limits are interpreted in the hMSSM benchmark scenario as an exclusion at 95% confidence on tan[beta] as a function of m[sub H^[+/-]]. In this scenario, for tan[beta] = 60, the H^[+/-] mass range up to 1100 GeV is excluded, with all values of tan[beta] exclude for m[sub H^[+/-]] [precedes or equivalent to] 160 GeV.
