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Book Search for Charged Higgs Bosons in Decays of Top Quarks in Proton Antiproton Collisions at S 1 2

Download or read book Search for Charged Higgs Bosons in Decays of Top Quarks in Proton Antiproton Collisions at S 1 2 written by and published by . This book was released on 2009 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation we report on the first direct search for charged Higgs bosons in decays of top quarks in p{bar p} collisions at √s = 1.96 TeV. The search uses a data sample with an integrated luminosity of 2.2 fb−1 collected by the CDF II detector at Fermilab and looks for a resonance in the invariant mass distribution of two jets in the lepton+jets sample of t{bar t} candidates. We observe no evidence of charged Higgs bosons in top quark decays; hence 95% C.L. upper limits on the branching ratio are placed at [Beta](t → H+b)

Book Search for Charged Higgs Bosons in Decays of Top Quarks in Proton Antiproton Collisions at u221A s

Download or read book Search for Charged Higgs Bosons in Decays of Top Quarks in Proton Antiproton Collisions at u221A s written by and published by . This book was released on 2009 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation we report on the first direct search for charged Higgs bosons in decays of top quarks in p$ar{p}$ collisions at √s = 1.96 TeV. The search uses a data sample with an integrated luminosity of 2.2 fb-1 collected by the CDF II detector at Fermilab and looks for a resonance in the invariant mass distribution of two jets in the lepton+jets sample of t$ar{t}$ candidates. We observe no evidence of charged Higgs bosons in top quark decays; hence 95% C.L. upper limits on the branching ratio are placed at ?(t → H+b) 0.1 to 0.3 for charged Higgs boson masses of 60 to 150 GeV/csup2/sup assuming ?(Hsup+/sup → c$ar{s}$) = 1.0 and ?(t → Wb)+?(t → Hsup+/supb) = 1.0. The upper limits on ?(t → Hsup+

Book A Search for Charged Higgs Boson Decays of the Top Quark Using Hadronic Decays of the Tau Lepton in Proton antiproton Collisions at Square Root S

Download or read book A Search for Charged Higgs Boson Decays of the Top Quark Using Hadronic Decays of the Tau Lepton in Proton antiproton Collisions at Square Root S written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].

Book Search for Charged Higgs Bosons in Decays of Top Quarks in P Anti p Collisions at S 1 2

Download or read book Search for Charged Higgs Bosons in Decays of Top Quarks in P Anti p Collisions at S 1 2 written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on the first direct search for charged Higgs bosons in decays of top quarks in p{bar p} collisions at √s = 1.96 TeV. The search uses a data sample corresponding to an integrated luminosity of 2.2 fb−1 collected by the CDF II detector at Fermilab, and looks for a resonance in the invariant mass distribution of two jets in the lepton+jets sample of t{bar t} candidates. We observe no evidence of charged Higgs bosons in top quark decays. Hence, 95% upper limits on the top quark decay branching ratio are placed at [Beta](t → H+b)

Book A Search for the Charged Higgs Boson Decays of the Top Quark Using Hadronic Decays of the Tau Lepton in Proton antiproton Collisions at square Root s

Download or read book A Search for the Charged Higgs Boson Decays of the Top Quark Using Hadronic Decays of the Tau Lepton in Proton antiproton Collisions at square Root s written by Leslie Stevan Groer and published by . This book was released on 1998 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Search for Top Quark Decays to a Charged Higgs Boson in Proton antiproton Collisions at a Center of mass Energy of 1 8 TeV

Download or read book A Search for Top Quark Decays to a Charged Higgs Boson in Proton antiproton Collisions at a Center of mass Energy of 1 8 TeV written by Brendan Bevensee and published by . This book was released on 1999 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Search for Charged Higgs Bosons in Decays of Top Quarks in P Anti p Collisions at S

Download or read book Search for Charged Higgs Bosons in Decays of Top Quarks in P Anti p Collisions at S written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on the first direct search for charged Higgs bosons in decays of top quarks in p{bar p} collisions at √s = 1.96 TeV. The search uses a data sample corresponding to an integrated luminosity of 2.2 fb−1 collected by the CDF II detector at Fermilab, and looks for a resonance in the invariant mass distribution of two jets in the lepton+jets sample of t{bar t} candidates. We observe no evidence of charged Higgs bosons in top quark decays. Hence, 95% upper limits on the top quark decay branching ratio are placed at?(t → Hb)

Book Search for Charged Higgs Bosons Produced in Association with a Top Quark and Decaying Via H 2 tau nu Using Pp Collision Data Recorded at mml

Download or read book Search for Charged Higgs Bosons Produced in Association with a Top Quark and Decaying Via H 2 tau nu Using Pp Collision Data Recorded at mml written by and published by . This book was released on 2016 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, charged Higgs bosons produced in association with a single top quark and decaying via H±→[tau][nu] are searched for with the ATLAS experiment at the LHC, using proton-proton collision data at √s=13 TeV corresponding to an integrated luminosity of 3.2 fb-1. The final state is characterised by the presence of a hadronic [tau] decay and missing transverse momentum, as well as a hadronically decaying top quark, resulting in the absence of high-transverse-momentum electrons and muons. The data are found to be consistent with the expected background from Standard Model processes. A statistical analysis leads to 95% confidence-level upper limits on the production cross section times branching fraction, [sigma](pp→[b]tH±)×BR(H±→[tau][nu]) , between 1.9 pb and 15 fb, for charged Higgs boson masses ranging from 200 to 2000 GeV. Finally, the exclusion limits for this search surpass those obtained with the proton-proton collision data recorded at √s=8 TeV.

Book Search for Charged Higgs Bosons Produced in Association with a Top Quark and Decaying Via H u2192 Using Pp Collision Data Recorded at

Download or read book Search for Charged Higgs Bosons Produced in Association with a Top Quark and Decaying Via H u2192 Using Pp Collision Data Recorded at written by and published by . This book was released on 2016 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, charged Higgs bosons produced in association with a single top quark and decaying via H±→?? are searched for with the ATLAS experiment at the LHC, using proton–proton collision data at √s=13 TeV corresponding to an integrated luminosity of 3.2 fb-1. The final state is characterised by the presence of a hadronic ? decay and missing transverse momentum, as well as a hadronically decaying top quark, resulting in the absence of high-transverse-momentum electrons and muons. The data are found to be consistent with the expected background from Standard Model processes. A statistical analysis leads to 95% confidence-level upper limits on the production cross section times branching fraction, ?(pp→[b]tH±)×BR(H±→??) , between 1.9 pb and 15 fb, for charged Higgs boson masses ranging from 200 to 2000 GeV. Finally, the exclusion limits for this search surpass those obtained with the proton–proton collision data recorded at √s=8 TeV.

Book Search for Charged Higgs Bosons in Decays of Pair produced Top Quarks at

Download or read book Search for Charged Higgs Bosons in Decays of Pair produced Top Quarks at written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a search for t[r-arrow] bH[sup+] in t[bar t] candidate events at D0 based on two methods. The first seeks a deficit in signal relative to expectations from the standard model (SM). Such a deficit would imply the presence of a non-SM decay of the top quark. This search involves the full data sample of[approx] 110 pb[sup[minus]1] of p[bar p] collisions at[radical]s= 1.8 TeV, collected with the D0 detector. The second method looks for charged Higgs decays to[tau] leptons (and associated neutrinos), and is based on a 62 pb[sup[minus]1] subset of the aforementioned data sample.

Book Search for Charged Higgs Bosons Decaying Into Top and Bottom Quarks with Single lepton Final States Using Pp Collisions Collected at a Centre of mass Energy of 13 TeV by the ATLAS Detector

Download or read book Search for Charged Higgs Bosons Decaying Into Top and Bottom Quarks with Single lepton Final States Using Pp Collisions Collected at a Centre of mass Energy of 13 TeV by the ATLAS Detector written by Francesco Peri and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: