3,510 research outputs found
Squark Effects on Higgs Boson Production and Decay at the LHC
In the context of the Minimal Supersymmetric extension of the Standard Model,
I discuss the effects of relatively light top and bottom scalar quarks on the
main production mechanism of the lightest SUSY neutral Higgs boson at the
LHC, the gluon--gluon fusion mechanism , and on the most promising
discovery channel, the two--photon decay mode . In some
areas of the parameter space, the top and bottom squark contributions can
strongly reduce the production cross section times the branching ratio.Comment: 10 pages, latex, including 4 epsfig
Lower Bounds on Charged Higgs Bosons from LEP and the TEVATRON
We point out that charged Higgs bosons can decay into final states different
than and , even when they are light enough to be
produced at LEPII or at the Tevatron, through top-quark decays. These
additional decay modes are overlooked in ongoing searches even though they
alter the existing lower bounds on the mass of charged Higgs bosons that are
present in supersymmetric and two Higgs doublets models.Comment: 9 pages, 4 figure
Precision Higgs physics at a collider
The loop induced coupling of an intermediate mass Higgs boson to two photons
is a sensitive and unique measure for precision tests of physics beyond the
Standard Model. In this work we summarize recent results on the expected
precision of the partial width at the option of a future linear collider. Heavy particles do not decouple in
general and differences between the SM and MSSM predictions or 2HD-models can
differ in the percentile regime. Large non-Sudakov DL corrections need to be
resummed and consistency requirements demand the use of the Sterman-Weinberg
jet definition in order to avoid additional DL terms from three jet final
states. We find that the well understood background process allows for a (2%) determination of using conservative collider parameters. Recent improvements in
the expected luminosity suggest that the precision for the
diphoton partial Higgs width can be further improved and is dominated by the
error in BR() from the mode, which is presently
estimated to be in the one percent regime.Comment: 6 pages, 3 epsfigures, Latex2e plus style files. Contribution to the
International Workshop on High Energy Photon Photon Colliders at DESY, June
200
Detection of MSSM Higgs bosons from supersymmetric particle cascade decays at the LHC
In the context of the Minimal Supersymmetric extension of the Standard Model,
we study the production of Higgs bosons at the Large Hadron Collider via
cascade decays of scalar quarks and gluinos. We focus on the cascades involving
heavier charginos and neutralinos, which decay into the neutral and
charged bosons and lighter charginos and neutralinos, but we will also
discuss direct decays of third--generation squarks into their lighter partners
and Higgs bosons as well as top quark decays into bosons. We show that
the production rates of relatively light Higgs bosons, M_\Phi \lsim 250 GeV,
via these mechanisms can be rather large in some areas of the parameter space.
Performing a fast detector simulation analysis that takes into account the
signals and the various backgrounds, we show that the detection of the neutral
Higgs bosons through their decays into pairs, and of the charged
Higgs particles through the signature, is possible at the LHC.Comment: 44 pages, latex, 17 figure
Higgs particles at future hadron and electron-positron colliders
The prospects for discovering Higgs particles and studying their fundamental
properties at future high-energy electron-positron and hadron colliders are
reviewed. Both the Standard Model Higgs boson and the Higgs particles of its
minimal supersymmetric extension are discussed. We update various results by
taking into account the new value of the top quark mass obtained by the CDF
Collaboration and by including radiative corrections some of which have been
calculated only recently.Comment: 64 pages / 29 figures (available by mail from the author). invited
review paper for Int.J.Mod.Phys.A, Latex styl
Tests of the Higgs properties at the next colliders
We discuss the tests of the fundamental properties of the Standard Model
Higgs boson that can be performed in the next round of experiments.Comment: 8 pages, 4 figures. Talk presented at PLC2005 Warsaw and Kazimierz
Lectures, 5/09-08/09 200
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