225,102 research outputs found
Higgs mass determination from direct reconstruction at a Linear e=e- Collider
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
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
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
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
QCD and electroweak corrections to production in collision
We calculate the QCD and
electroweak one-loop corrections in the Standard Model framework, to the
production of an intermediate Higgs boson associated with pair via
fusion at an electron-positron linear collider (LC). We find
the QCD corrections can be larger than the electroweak ones, with the variations of the Higgs boson
mass and colliding energy . 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 GeV and GeV, while those from
electroweak can be -13.1%, -15.8% and -12.0%, at GeV, 1 TeV
and 2 TeV respectively.Comment: 38 pages, 16 figure
Electroweak radiative corrections to at linear colliders
We calculate the electroweak radiative
corrections to at a electron-positron linear collider
(LC) in the standard model. We analyze the dependence of the corrections on the Higgs boson mass and
colliding energy , and find that the corrections significantly
decrease or increase the Born cross section depending on the colliding energy.
The numerical results show that the relative
correction is strongly related to the Higgs boson mass when ,
and for 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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