225,102 research outputs found

    Higgs mass determination from direct reconstruction at a Linear e=e- Collider

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    We study the feasibility of a precise measurement of the mass of a 120 GeV MSM Higgs boson through direct reconstruction of ZH->qqH events that would be achieved in a future e+e- linear collider operating at a center-of-mass energy of 500 GeV. Much effort has been put in a ``realistic simulation'' by including irreducible and reducible backgrounds, realistic detector effects and reconstruction procedures and sophisticated analysis tools involving Neural Networks and kinematical fitting. As a result, the Higgs mass is determined with a statistical accuracy of 50 MeV and the Z-Higgs Yukawa coupling measured to 0.7%, assuming 500 fb^-1 of integrated luminosity.Comment: LaTex, 29 pages, 18 Postscript figure

    Towards a precise measurement of the top quark Yukawa coupling at the ILC

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    A precise measurement of the top quark Yukawa coupling is of great importance, since it may shed light on the mechanism of EWSB. We study the prospects of such measurement during the first phase of the ILC at sqrt(s)=500 GeV, focusing in particular on recent theoretical developments as well as the potential benefits of beam polarization. It is shown that both yield improvements that could possibly lead to a measurement competitive with the LHC.Comment: Invited talk at 2005 International Linear Collider Physics and Detector Workshop and Second ILC Accelerator Workshop, Snowmass, CO (Snowmass05) 3 pages, LaTeX, 3 eps figure

    Top Quark Current Experimental Status

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    Ten years after its discovery at the Tevatron collider, we still know little about the top quark. Its large mass suggests it may play a key role in the mechanism of Electroweak Symmetry Breaking (EWSB), or open a window of sensitivity to new physics related to EWSB and preferentially coupled to it. To determine whether this is the case, precision measurements of top quark properties are necessary. The high statistics samples being collected by the Tevatron experiments during Run II start to incisively probe the top quark sector. This report summarizes the experimental status of the top quark, focusing in particular on the recent measurements from the Tevatron.Comment: 12 pages, 6 figures, 1 table. Talk presented at TOP 2006, International Workshop on Top Quark Physics, Coimbra, Portugal, January 12-15, 2006. To appear in the proceeding

    Higgs Boson Theory and Phenomenology

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    Precision electroweak data presently favors a weakly-coupled Higgs sector as the mechanism responsible for electroweak symmetry breaking. Low-energy supersymmetry provides a natural framework for weakly-coupled elementary scalars. In this review, we summarize the theoretical properties of the Standard Model (SM) Higgs boson and the Higgs sector of the minimal supersymmetric extension of the Standard Model (MSSM). We then survey the phenomenology of the SM and MSSM Higgs bosons at the Tevatron, LHC and a future e+e- linear collider. We focus on the Higgs discovery potential of present and future colliders and stress the importance of precision measurements of Higgs boson properties.Comment: 90 pages, 31 figures. Revised version. To be published in Progress in Particle and Nuclear Physics. This paper with higher resolution figures can be found at http://scipp.ucsc.edu/~haber/higgsreview/higgsrev.p

    O(αs){\cal O}(\alpha_{s}) QCD and O(αew){\cal O}(\alpha_{ew}) electroweak corrections to ttˉh0t\bar{t}h^0 production in γγ\gamma \gamma collision

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    We calculate the O(αs){\cal O}(\alpha_{s}) QCD and O(αew){\cal O}(\alpha_{{\rm ew}}) electroweak one-loop corrections in the Standard Model framework, to the production of an intermediate Higgs boson associated with ttˉt\bar{t} pair via γγ\gamma \gamma fusion at an electron-positron linear collider (LC). We find the O(αs){\cal O}(\alpha_{s}) QCD corrections can be larger than the O(αew){\cal O}(\alpha_{{\rm ew}}) electroweak ones, with the variations of the Higgs boson mass mhm_{h} and e+e−e^+e^- colliding energy s\sqrt{s}. Both corrections may significantly decrease or increase the Born cross section. The numerical results show that the relative corrections from QCD to the process \eep may reach 34.8%, when s=800\sqrt{s}=800 GeV and mh=200m_h=200 GeV, while those from electroweak can be -13.1%, -15.8% and -12.0%, at s=800\sqrt{s} = 800 GeV, 1 TeV and 2 TeV respectively.Comment: 38 pages, 16 figure

    Electroweak radiative corrections to e+e−→ttˉhe^+e^- \to t \bar{t} h at linear colliders

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    We calculate the O(αew){\cal O}(\alpha_{{\rm ew}}) electroweak radiative corrections to e+e−→ttˉhe^+ e^- \to t \bar{t} h at a electron-positron linear collider (LC) in the standard model. We analyze the dependence of the O(αew){\cal O}(\alpha_{{\rm ew}}) corrections on the Higgs boson mass mhm_{h} and colliding energy s\sqrt{s}, and find that the corrections significantly decrease or increase the Born cross section depending on the colliding energy. The numerical results show that the O(αew){\cal O}(\alpha_{{\rm ew}}) relative correction is strongly related to the Higgs boson mass when s=500GeV\sqrt{s}=500 GeV, and for mh=150GeVm_h = 150 GeV the relative correction ranges from -31.3% to 2.3% as the increment of the colliding energy from 500 GeV to 2 TeV.Comment: 16 pages, 7 figure
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