12,690 research outputs found
Searches for new particles at LEP: a summary report
We review the progress made at LEP in the quest for new particles.Comment: 10 pages, latex, 1 figure, summary talk given at `13th Convegno sulla
Fisica al LEP (LEPTRE 2001)', Rome, Italy, 18-20 April 200
Six-Fermion Calculation of Intermediate-mass Higgs Boson Production at Future Colliders
The production of an intermediate-mass Higgs boson in processes of the kind
fermions at the energies of future linear colliders is studied.
The recently developed and fully automatic algorithm/code ALPHA is used to
compute the tree-level scattering amplitudes for the reactions . The code has been interfaced with the Monte Carlo program HIGGSPV/WWGENPV,
properly adapted to 6-fermion production, in order to provide realistic
results, both in the form of cross sections and event samples at the partonic
level. Phenomenological results, that incorporate the effects of initial-state
radiation and beamstrahlung, are shown and commented, emphasizing the
potentials of full six-fermion calculations for precise background evaluation
as well as for detailed studies of the fundamental properties of the Higgs
particle.Comment: 31 pages, LaTeX, 15 eps low-resolution figures include
Fluctuation phenomena in crystal plasticity - a continuum model
On microscopic and mesoscopic scales, plastic flow of crystals is
characterized by large intrinsic fluctuations. Deformation by crystallographic
slip occurs in a sequence of intermittent bursts ('slip avalanches') with
power-law size distribution. In the spatial domain, these avalanches produce
characteristic deformation patterns in the form of slip lines and slip bands
which exhibit long-range spatial correlations. We propose a generic continuum
model which accounts for randomness in the local stress-strain relationships as
well as for long-range internal stresses that arise from the ensuing plastic
strain heterogeneities. The model parameters are related to the local dynamics
and interactions of lattice dislocations. The model explains experimental
observations on slip avalanches as well as the associated slip and surface
pattern morphologies
Study of boundary-layer transition using transonic-cone preston tube data
The laminar boundary layer on a 10 degree cone in a transonic wind tunnel was studied. The inviscid flow and boundary layer development were simulated by computer programs. The effects of pitch and yaw angles on the boundary layer were examined. Preston-tube data, taken on the boundary-layer-transition cone in the NASA Ames 11 ft transonic wind tunnel, were used to develope a correlation which relates the measurements to theoretical values of laminar skin friction. The recommended correlation is based on a compressible form of the classical law-of-the-wall. The computer codes successfully simulates the laminar boundary layer for near-zero pitch and yaw angles. However, in cases of significant pitch and/or yaw angles, the flow is three dimensional and the boundary layer computer code used here cannot provide a satisfactory model. The skin-friction correlation is thought to be valid for body geometries other than cones
Radiative four-fermion processes at LEP2
The production of four fermions plus a visible photon in electron-positron
collisions is analyzed, with particular emphasis on the LEP2 energy range. The
study is based on the calculation of exact matrix elements, including the
effect of fermion masses. In the light of the present measurements performed at
LEP, triple and quartic anomalous gauge couplings are taken into account. Due
to the presence of a visible photon in the final state, particular attention is
paid to the treatment of higher-order QED corrections. Explicit results for
integrated cross sections and differential distributions are shown and
commented. The features of the Monte Carlo program WRAP, used to perform the
calculation and available for experimental analysis, are described.Comment: LaTeX, 14 pages, 6 tables, 13 figures. Numerical results added,
version to appear in Eur. Phys. J.
Unitarity constraints on top quark signatures of Higgsless models
We use conditions for unitarity cancellations to constrain the couplings of
the top and bottom quarks to Kaluza-Klein modes in Higgsless models of
electroweak symmetry breaking. An example for the mass spectrum of quark
resonances in a theory space model is given and the implications for the
collider phenomenology in the top sector are discussed, comparing to signatures
of Little Higgs and strong electroweak symmetry breaking models.Comment: 19 pages LaTeX, 4 figures; published versio
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