3,547 research outputs found
High-Mass Supersymmetry with High Energy Hadron Colliders
While it is natural for supersymmetric particles to be well within the mass
range of the large hadron collider, it is possible that the sparticle masses
could be very heavy. Signatures are examined at a very high energy hadron
collider and an very high luminosity option for the Large Hadron Collider in
such scenarios
Measurements of Masses in SUGRA Models at LHC
This paper presents new measurements in a case study of the minimal SUGRA
model with m_0=100 GeV, mhalf=300 GeV, A_0=0, tan(beta)=2.1, and mu=+1 based on
four-body distributions from three-step decays and on minimum masses in such
decays. These measurements allow masses of supersymmetric particles to be
determined without relying on a model. The feasibility of testing slepton
universality at the ~0.1% level at high luminosity is discussed. In addition,
the effect of enlarging the parameter space of the minimal SUGRA model is
discussed. The direct production of left handed sleptons and the
non-observation of additional structure in the dilepton invariant mass
distributions is shown to provide additional constraints.Comment: 30 pages, 22 figure
Measurements in Gauge Mediated SUSY Breaking Models at LHC
Characteristic examples are presented of scenarios of particle production and
decay in supersymmetry models in which the supersymmetry breaking is
transmitted to the observable world via gauge interactions. The cases are
chosen to illustrate the main classes of LHC phenomenology that can arise in
these models. A new technique is illustrated that allows the full
reconstruction of supersymmetry events despite the presence of two unobserved
particles. This technique enables superparticle masses to be measured directly
rather than being inferred from kinematic distributions. It is demonstrated
that the LHC is capable of making sufficient measurements so as to severely
over-constrain the model and determine the parameters with great precisionComment: 45 pages, 35 Figure
Lepton Flavor Violation at the LHC
Recent results from Super Kamiokande suggest mixing and
hence lepton flavor violation. In supersymmetric models, this flavor violation
may have implications for the pattern of slepton masses and mixings. Possible
signals for this mixing in the decays of sleptons produced at the LHC are
discussed. The sensitivity expected is compared to that of rare decays such as
.Comment: 14 pages, 9 figure
Measurements in SUGRA Models with Large tan beta at LHC
We present an example of a scenario of particle production and decay in
supersymmetry models in which the supersymmetry breaking is transmitted to the
observable world via gravitational interactions. The case is chosen so that
there is a large production of tau leptons in the final state. It is
characteristic of large tan beta in that decays into muons and electrons may be
suppressed. It is shown that hadronic tau decays can be used to reconstruct
final states.Comment: 15 pages, 12 figure
Universality in the Electroproduction of Vector Mesons
We study universality in the electroproduction of vector mesons using a
unified nonperturbative approach which has already proved to reproduce
extremely well the available experimental data. In this framework, after the
extraction of factors that are specific of each vector meson, we arrive at a
reduced integrated elastic cross section which is universal. Our calculations
suggest a finite infrared behavior for the strong coupling constant.Comment: 22 pages, 10 figure
Chemotactic Collapse and Mesenchymal Morphogenesis
We study the effect of chemotactic signaling among mesenchymal cells. We show
that the particular physiology of the mesenchymal cells allows one-dimensional
collapse in contrast to the case of bacteria, and that the mesenchymal
morphogenesis represents thus a more complex type of pattern formation than
those found in bacterial colonies. We finally compare our theoretical
predictions with recent in vitro experiments
Flavor Asymmetry of the Nucleon Sea: Consequences for Dilepton Production
Parton distributions derived from a chiral quark model that generates an
excess of down quarks and antiquarks in the proton's sea satisfactorily
describe the measured yields of muon pairs produced in proton-nucleus
collisions. Comparison of dilepton yields from hydrogen and deuterium targets
promises greater sensitivity to the predicted flavor asymmetry.Comment: 11 pages, REVTEX, (Three PostScript figures available by anonymous
ftp from fnth06.fnal.gov in directory /pub/Fermilab-Pub/92.264.)
FERMILAB-PUB-92/264--T LBL-3298
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