2,621 research outputs found
Modern Dynamical Coupled-Channels Calculations for Extracting and Understanding the Nucleon Spectrum
We give an overview of recent progress in the spectroscopic study of nucleon
resonances within the dynamical coupled-channels analysis of meson-production
reactions. The important role of multichannel reaction dynamics in
understanding various properties of nucleon resonances is emphasized.Comment: 11 pages, 8 figures. Plenary talk at The 14th International
Conference on Meson-Nucleon Physics and the Structure of the Nucleon
(MENU2016), Kyoto, Japan, July 25-30, 201
Accuracy of Measurement for Counting and Intensity-Correlation Experiments
A quantum-mechanical analysis is made of the experimental accuracy to be expected for particle-counting and intensity-correlation experiments. The mean-square fluctuation for an ensemble, consisting of a large number of experiments each conducted over a time interval T, is calculated
Regge Trajectories with Square-Root Branch Points and Their Regge Cuts
We discuss branch points in the complex angular momentum plane formed by two Regge poles on trajectories with square-root branch points at t=0. We find several new cuts which collide with the expected Mandelstam cuts at t=0. In the bootstrap of the Pomeranchon pole, the collection of cuts has the same effect as in the case of linear trajectories: The Pomeranchon can have α(0)=1 only if certain couplings vanish at t=0
Dynamical Entanglement in Particle Scattering
This paper explores the connections between particle scattering and quantum
information theory in the context of the non-relativistic, elastic scattering
of two spin-1/2 particles. An untangled, pure, two-particle in-state is evolved
by an S-matrix that respects certain symmetries and the entanglement of the
pure out-state is measured. The analysis is phrased in terms of unitary,
irreducible representations (UIRs) of the symmetry group in question, either
the rotation group for the spin degrees of freedom or the Galilean group for
non-relativistic particles. Entanglement may occurs when multiple UIRs appear
in the direct sum decomposition of the direct product in-state, but it also
depends of the scattering phase shifts. \keywords{dynamical entanglement,
scattering, Clebsch-Gordan methods}Comment: 6 pages, submitted to Int. J. Mod. Phys. A as part of MRST 2005
conference proceeding
Regge Poles in High-Energy Electron Scattering
The possibility that the photon is described by a Regge trajectory is considered, and the effect of this assumption on the analysis of electron-pion, electron-nucleon, and electron-helium scattering is examined in some detail. Partial-wave projections for the various amplitudes are made in the annihilation channel, and a multiparticle unitarity condition is formally imposed by use of the N/D matrix formulation. Since the photon does not have a fixed spin of one, the spin matrix structure is considerably more complicated than in the conventional theory. The amplitudes are written in terms of the Regge poles corresponding to the photon, ρ-ω meson, etc., and the resulting cross sections are given in the interesting high-energy limit. In contrast to the usual analysis, where form factors depend only on the momentum transfer, we find a larger number of independent functions which depend on the energy as well, however, in a characteristic manner. That is, the essential change due to the Regge behavior of the photon is an over-all nonintegral power of the energy occurring in the cross section. The effect of this factor can be experimentally tested and this possibility is discussed
Intensity-Correlation Spectroscopy
A survey is given of techniques for spectroscopic analysis using intensity fluctuations. Particular attention is given to counting times, the role of macroscopic sources and detectors, and the electronic constraints placed on the observations
Entanglement Generation in the Scattering of One-Dimensional Particles
This article provides a convenient framework for quantitative evaluation of
the entanglement generated when two structureless, distinguishable particles
scatter non-relativistically in one dimension. It explores how three factors
determine the amount of entanglement generated: the momentum distributions of
the incoming particles, their masses, and the interaction potential. Two
important scales emerge, one set by the kinematics and one set by the dynamics.
This method also provides two approximate analytic formulas useful for
numerical evaluation of entanglement and reveals an interesting connection
between purity, linear coordinate transformations, and momentum uncertainties.Comment: 11 pages, submitted to PR
On the Second Virial Coefficient
The second virial coefficient is calculated by a new method which exploits certain results known from formal scattering theory. In particular it is shown that the essential quantity may be expressed as the determinant of the S matrix at a given energy. The present approach suggests several approximation techniques and also seems applicable to many-body problems
Mu Capture, Beta Decay, and Pi-Meson Decay
In the original Yukawa formulation of meson theory,
the π meson (as we now believe Yukawa's particle to
be) was to provide a natural explanation for β decay.
The process π → e + ν[bar] was regarded as an elementary
interaction and nuclear β decay was imagined to proceed
by the route n → p + π → μ + e + ν[bar]. There are a variety
of reasons why this scheme fails. Just the opposite point
of view is now generally adopted, namely, that the
nuclear β decay is fundamental and that the observed
decay of the π meson is to be explained in terms of it.
We do not exclude the possibility that β decay be
described in terms of an as yet unknown heavy intermediate.
Nevertheless, the nuclear β decay is to be
regarded as essentially primary. In order to describe the
actual dominant π-meson decay mode π → μ + ν[bar] it is
necessary to assume the existence of another β decay
like process, μ-meson capture. The elementary process
may be described as μ + p → n + ν, or equally well as
n + p[bar] → μ + ν[bar]; the first is the experimentally observed
μ-meson absorption reaction, whereas, the second, the
annihilation of a neutron and an antiproton, plays an
important role in π-meson decay
Dirac-Coulomb scattering with plane wave energy eigenspinors on de Sitter expanding universe
The lowest order contribution of the amplitude of Dirac-Coulomb scattering in
de Sitter spacetime is calculated assuming that the initial and final states of
the Dirac field are described by exact solutions of the free Dirac equation on
de Sitter spacetime with a given energy and helicity. We find that the total
energy is conserved in the scattering process.Comment: 9 pages, no figure
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