7,715 research outputs found
Summary of the Very Large Hadron Collider Physics and Detector Subgroup
We summarize the activity of the Very Large Hadron Collider Physics and
Detector subgroup during Snowmass 96.Comment: To appear in the Proceedings of the 1996 DPF/DPB Summer Study on New
Directions for High-Energy Physics, Snowmass 9
Large deviations for random walks under subexponentiality: the big-jump domain
For a given one-dimensional random walk with a subexponential
step-size distribution, we present a unifying theory to study the sequences
for which as
uniformly for . We also investigate the stronger "local"
analogue, . Our
theory is self-contained and fits well within classical results on domains of
(partial) attraction and local limit theory. When specialized to the most
important subclasses of subexponential distributions that have been studied in
the literature, we reproduce known theorems and we supplement them with new
results.Comment: Published in at http://dx.doi.org/10.1214/07-AOP382 the Annals of
Probability (http://www.imstat.org/aop/) by the Institute of Mathematical
Statistics (http://www.imstat.org
An evolution equation as the WKB correction in long-time asymptotics of Schrodinger dynamics
We consider 3d Schrodinger operator with long-range potential that has
short-range radial derivative. The long-time asymptotics of non-stationary
problem is studied and existence of modified wave operators is proved. It turns
out, the standard WKB correction should be replaced by the solution to certain
evolution equation.Comment: This is a preprint of an article whose final and definitive form has
been published in Comm. Partial Differential Equations, available online at
http://www.informaworld.co
Probing the deuteron structure at small NN distances by antiproton-deuteron annihilation
The production of pions by antiproton-deuteron annihilation at rest is
analyzed. Assuming the possible existence of two delta-isobars in a deuteron
some enhancement in the distribution over the invariant mass of two negative
charged pions is predicted.Comment: 12 pages, Latex and Postscrip
Nuclear collective motion with a coherent coupling interaction between quadrupole and octupole modes
A collective Hamiltonian for the rotation-vibration motion of nuclei is
considered, in which the axial quadrupole and octupole degrees of freedom are
coupled through the centrifugal interaction. The potential of the system
depends on the two deformation variables and . The system is
considered to oscillate between positive and negative -values, by
rounding an infinite potential core in the -plane with
. By assuming a coherent contribution of the quadrupole and octupole
oscillation modes in the collective motion, the energy spectrum is derived in
an explicit analytic form, providing specific parity shift effects. On this
basis several possible ways in the evolution of quadrupole-octupole
collectivity are outlined. A particular application of the model to the energy
levels and electric transition probabilities in alternating parity spectra of
the nuclei Nd, Sm, Gd and Dy is presented.Comment: 25 pages, 13 figures. Accepted in Phys. Rev.
Directed transient long-range transport in a slowly driven Hamiltonian system of interacting particles
We study the Hamiltonian dynamics of a one-dimensional chain of linearly
coupled particles in a spatially periodic potential which is subjected to a
time-periodic mono-frequency external field. The average over time and space of
the related force vanishes and hence, the system is effectively without bias
which excludes any ratchet effect. We pay special attention to the escape of
the entire chain when initially all of its units are distributed in a potential
well. Moreover for an escaping chain we explore the possibility of the
successive generation of a directed flow based on large accelerations. We find
that for adiabatic slope-modulations due to the ac-field transient long-range
transport dynamics arises whose direction is governed by the initial phase of
the modulation. Most strikingly, that for the driven many particle Hamiltonian
system directed collective motion is observed provides evidence for the
existence of families of transporting invariant tori confining orbits in
ballistic channels in the high dimensional phase spaces
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