685 research outputs found
HERA prospects on Compositeness and New Vector Bosons
The absence of deviations from the Standard Model for the differential cross
section at HERA is used to set limits on electron quark
compositeness scale and on new vector bosons, especially the hadrophilic one
recently introduced as a possible explanation for LEP/SLC and CDF anomalies.Comment: Latex file, 7 pages and 1 ps fig, few comments on others experiments
are added, results are unchanged. To appear in Phys. Let.
TOP-INDUCED ELECTROWEAK BREAKING IN THE MINIMAL SUPERSYMMETRIC STANDARD MODEL
Severe constraints on parameters of the minimal supersymmetric standard model
follow from a dynamical electroweak symmetry breaking mechanism dominated by
top and stop loops. In particular, the lightest Higgs boson mass is expected to
be smaller than 100 GeV.Comment: 10 pages, Latex, 6 Postcript Figure
Probing quark compositeness at hadronic colliders : the case of polarized beams
A new handed interaction between subconstituents of quarks could be at the
origin of some small parity violating effects in one-jet inclusive production.
Within a few years, the Relativistic Heavy Ion Collider (RHIC) will be used as
a polarized proton-proton collider.
In this context, we analyse the possibilities of disentangling some new
parity violating effects from the standard spin asymmetries which are expected
due to the Standard Model QCD-Weak interference. We also explore the
possibilities of placing some more stringent limits on the quark compositeness
scale thanks to measurements of such spin asymmetries.Comment: 10 pages, Latex, 4 figures to be appende
Hadrophilic Z': and explanation of LEP1, SLC and CDF anomalies?
In order to explain possible departures from the Standard Model predictions of and production at Z peak, we propose the existence of a Z' vector boson with enhanced couplings to quarks. We first show that this proposal is perfectly consistent with the full set LEP1/SLC results. We then show that there is a predicted range for enhanced Z' couplings which explains, for Z' masses in the TeV range, the excess of dijet events seen at CDF and leads to visible deviations at LEP2
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