1,336 research outputs found
Non-minimal neutral Higgs bosons at LEP2
We study the phenomenology of the neutral Higgs sector of a non-SUSY
non-minimal Standard Model. Models with more than one Higgs doublet are
possible, and may contain neutral Higgs scalars with branching ratios
significantly different to those of the Minimal Standard Model Higgs boson. We
show how these differences may be exploited at LEP2 in order to distinguish the
non-minimal Standard Model from the minimal version.Comment: 12 pages inc 4 figures, Latex, to appear in Physics Letters
Hidden top quark decays to charged Higgs scalars at the Tevatron
Charged Higgs scalars light enough to contribute to top quark decays are
possible in various non--minimal Higgs models. We show that such a decay would
be consistent with the current Tevatron data, and will remain hidden until a
larger luminosity can be achieved.Comment: 17 pages, latex, 6 figure
Single and pair production of MSSM Higgs bosons as a probe of scalar-pseudoscalar mixing at e+e- colliders
We study the associated production of the neutral CP--odd Higgs boson
with a neutral gauge boson as well as single production of via
at the one loop level in the Minimal
Supersymmetric Standard Model (MSSM). We show that the MSSM cross--section may
be enhanced by light SUSY particles. Then we study the production processes
, and in the context of
the MSSM with scalar-pseudoscalar mixing. In a given channel we show that the
cross--section for all i (=1,2,3) can be above 0.1 fb provided M_{H_{2,3}}\la
300 GeV. This should be detectable at a Next Linear Collider and would provide
evidence for scalar--pseudoscalar mixing.Comment: 7 pages, latex, 2 eps figures, preprints LPHEA/2002-05,
MPI-PhT/2002-64, Talk given at the 10th International Conference on
Supersymmetry and Unification of Fundamental Interactions, DESY, Hamburg,
Germany, June 17--23, 200
Fermiophobic Higgs bosons at LEP
This work describes the results of the searches for a Higgs boson decaying
into gauge bosons carried out by the four LEP collaborations: ALEPH, DELPHI, L3
and OPAL. A lower bound of 109.7 GeV is set at 95% confidence level on the mass
of a fermiophobic Higgs boson decaying into photons. This mass limit can be
extended by considering the Higgs decay mode into weak bosons. Such a
combination has been done by the L3 collaboration which extended the
fermiophobic mass by 5 GeV.Comment: Talk presented at the ICHEP02 conference, Amsterdam, July 2002, 3
pages, 4 figure
Fermiophobic Higgs bosons at the Tevatron
Higgs bosons with negligible couplings to fermions can arise in various
non--minimal Higgs sectors. We show that such a particle could be discovered
during the current run at the Tevatron, and would be evidence against a minimal
supersymmetric Higgs sector.Comment: 10 pages, Latex, 5 figures, to appear in Phys. Lett. B, figures
include
Constraint on the branching ratio of B_c \to tau nu from LEP1 and consequences for R(D(*)) anomaly
Recently there has been interest in the correlation between R(D*) and the
branching ratio (BR) of in models with a charged scalar
H^\pm. Any enhancement of R(D*) by alone (in order to agree with
current data) also enhances ), for which there has been no
direct search at hadron colliders. We show that LEP data taken at the Z peak
requires BR() < 10%, and this constraint is significantly
stronger than the recent constraint BR() < 30% from
considering the lifetime of B_c. In order to respect this new constraint, any
explanation of the R(D) and R(D*) anomaly in terms of alone would
require the future measurements of R(D*) to be even closer to the Standard
Model prediction. A stronger limit on BR() (or its first
measurement) would be obtained if the L3 collaboration used all its data taken
at the Z peak.Comment: 14 pages, 4 figures, a reference and two sentences adde
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