2,501 research outputs found
Reconstruction of the Extended Gauge Structure from Observables at Future Colliders
The discovery of a new neutral gauge boson with a mass in the TeV region
would allow for determination of gauge couplings of the to ordinary quarks
and leptons in a model independent way. We show that these couplings in turn
would allow us to determine the nature of the extended gauge structure. As a
prime example we study the group. In this case two discrete constraints
on experimentally determined couplings have to be satisfied. If so, the
couplings would then uniquely determine the two parameters, and
, which fully specify the nature of the within . If the
is part of the gauge structure, then for TeV and
could be determined to around at the future colliders. The NLC
provides a unique determination of the two constraints as well as of and , though with slightly larger error bars than at the LHC. On
the other hand, since the LHC primarily determines three out of four normalized
couplings, it provides weaker constraints for the underlying gauge structure.Comment: 14 pages LaTeX using RevTeX and psfig.sty. TeX source and 3 PS
figures, tarred, compressed and uuencoded; also available via anonymous ftp
to ftp://dept.physics.upenn.edu/pub/Cvetic/UPR-636-T
Off-the-Wall Higgs in the Universal Randall-Sundrum Model
We outline a consistent Randall-Sundrum (RS) framework in which a fundamental
5-dimensional Higgs doublet induces electroweak symmetry breaking (EWSB). In
this framework of a warped Universal Extra Dimension, the lightest Kaluza-Klein
(KK) mode of the bulk Higgs is tachyonic leading to a vacuum expectation value
(vev) at the TeV scale. The consistency of this picture imposes a set of
constraints on the parameters in the Higgs sector. A novel feature of our
scenario is the emergence of an adjustable bulk profile for the Higgs vev. We
also find a tower of non-tachyonic Higgs KK modes at the weak scale. We
consider an interesting implementation of this ``Off-the-Wall Higgs'' mechanism
where the 5-dimensional curvature-scalar coupling alone generates the tachyonic
mode responsible for EWSB. In this case, additional relations among the
parameters of the Higgs and gravitational sectors are established. We discuss
the experimental signatures of the bulk Higgs in general, and those of the
``Gravity-Induced'' EWSB in particular.Comment: 27 pages, 4 figure
The Production of Associated With Photons or Jets as a Probe of New Gauge Boson Couplings
We examine the production of a new gauge boson in association with
photons or jets at future hadron supercolliders as a probe of its couplings to
fermions. Associated jet production is found to be rather insensitive to these
couplings and suffers from large uncertainties as well as substantial
backgrounds. On the other hand, the ratio of rates for associated photon
production to that of conventional production has a rather clean signature
(once appropriate cuts are made), and is found to be quite sensitive to the
choice of extended electroweak model, while being simultaneously insensitive to
structure function uncertainties and QCD corrections. Rates at both the SSC and
LHC are significant for masses in the 1 TeV range.Comment: 14pp, 6 figs(not included), LaTex, ANL-HEP-PR-92-5
Lorentz Violation in Extra Dimensions
In theories with extra dimensions it is well known that the Lorentz
invariance of the -dimensional spacetime is lost due to the compactified
nature of the dimensions leaving invariance only in 4d. In such theories
other sources of Lorentz violation may exist associated with the physics that
initiated the compactification process at high scales. Here we consider the
possibility of capturing some of this physics by analyzing the higher
dimensional analog of the model of Colladay and Kostelecky. In that scenario a
complete set of Lorentz violating operators arising from spontaneous Lorentz
violation, that are not obviously Planck-scale suppressed, are added to the
Standard Model action. Here we consider the influence of the analogous set of
operators which break Lorentz invariance in 5d within the Universal Extra
Dimensions picture. We show that such operators can greatly alter the
anticipated Kaluza-Klein(KK) spectra, induce electroweak symmetry breaking at a
scale related to the inverse compactification radius, yield sources of parity
violation in, e.g., 4d QED/QCD and result in significant violations of
KK-parity conservation produced by fermion Yukawa couplings, thus destabilizing
the lightest KK particle. LV in 6d is briefly discussed.Comment: 26 pages, 2 figures; additional references and discussio
Searching for Anomalous Weak Couplings of Heavy Flavors at the SLC and LEP
The existence of anomalous electric() and/or
magnetic() dipole moment couplings between the heavy flavor fermions
() and the boson can cause significant shifts in the values of
several electroweak observables currently being probed at both the SLC and LEP.
Using the good agreement between existing data and the predictions of the
Standard Model we obtain strict bounds on the possible strength of these new
interactions for all of the heavy flavors. The decay ,
however, provides some possible hint of new physics. The corresponding
anomalous couplings of 's to photons is briefly examined.Comment: 21 pages, 14 figs(available on request), LaTex, SLAC-PUB-667
The effects of non-universal extra dimensions on the radiative lepton flavor decays \mu\to e\gamma and \tau\to \mu\gamma in the two Higgs doublet model
We study the effect of non-universal extra dimensions on the branching ratios
of the lepton flavor violating processes \mu\to e\gamma and \tau\to \mu\gamma
in the general two Higgs doublet model. We observe that these effects are small
for a single extra dimension, however, in the case of two extra dimensions
there is a considerable enhancement in the additional contributions.Comment: 16 Pages, 9 Figure
Can We Observe Weak Anomalous Couplings of Heavy Quarks Through Three Jet Events?
The rates and corresponding jet distributions for the decay
and the process may be sensitive to anomalous dipole-like
couplings of heavy quarks to the photon and . In the -quark case, after
updating our previous analysis on the constraints imposed by current
experiments on anomalous couplings, we show that the variation of
these couplings within their presently allowed ranges leads to rather minor
modifications to the Standard Model expectations for
observables. In the -quark case, significant deviations from the Standard
Model predictions for production at the Next Linear Collider are
possible.Comment: 26 pages with 9 embedded figures; gzipped, uuencoded postscript file.
To obtain a copy of this paper send e-mail to [email protected]
Brane-localized Kinetic Terms in the Randall-Sundrum Model
We examine the effects of boundary kinetic terms in the Randall-Sundrum model
with gauge fields in the bulk. We derive the resulting gauge Kaluza-Klein (KK)
state wavefunctions and their corresponding masses, as well as the KK gauge
field couplings to boundary fermions, and find that they are modified in the
presence of the boundary terms. In particular, for natural choices of the
parameters, these fermionic couplings can be substantially suppressed compared
to those in the conventional Randall-Sundrum scenario. This results in a
significant relaxation of the bound on the lightest gauge KK mass obtained from
precision electroweak data; we demonstrate that this bound can be as low as a
few hundred GeV. Due to the relationship between the lightest gauge KK state
and the electroweak scale in this model, this weakened constraint allows for
the electroweak scale to be near a TeV in this minimal extension of the
Randall-Sundrum model with bulk gauge fields, as opposed to the conventional
scenario.Comment: 24 pages, 8 figures, LaTex. Discussion and figure added addressing
the effects of this analysis on the hierarch
TaqMan probe assays on different biological samples for the identification of three ambrosia beetle species, Xylosandrus compactus (Eichoff), X. crassiusculus (Motschulsky) and X. germanus (Blandford) (Coleoptera Curculionidae Scolytinae)
Molecular assays based on qPCR TaqMan Probes were developed to identify three species of the genus Xylosandrus, X.
compactus, X. crassiusculus and X. germanus (Coleoptera Curculionidae Scolytinae). These ambrosia beetles are xylophagous
species alien to Europe, causing damages to many ornamental and fruiting trees as well as shrubs. DNA extraction was
carried out from adults, larvae and biological samples derived from insect damages on infested plants. For X. compactus,
segments of galleries in thin infested twigs were cut and processed; in the case of X. crassiusculus, raw frass extruded from
exit holes was used, while DNA of X. germanus was extracted from small wood chips removed around insect exit holes. The
assays were inclusive for the target species and exclusive for all the non-target species tested. The LoD was 3.2 pg/ÎŒL for
the frass of X. crassiusculus and 0.016 ng/ÎŒL for the woody matrices of the other two species. Both repeatability and reproducibility
were estimated on adults and woody samples, showing very low values ranging between 0.00 and 4.11. Thus, the
proposed diagnostic assays resulted to be very efficient also on the woody matrices used for DNA extraction, demonstrating
the applicability of the protocol in the absence of dead specimens or living stages
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