7,470 research outputs found
Pion Polarizability in the NJL model and Possibilities of its Experimental Studies in Coulomb Nuclear Scattering
The charge pion polarizability is calculated in the Nambu-Jona-Lasinio model,
where the quark loops (in the mean field approximation) and the meson loops (in
the approximation) are taken into account. We show that quark loop
contribution dominates, because the meson loops strongly conceal each other.
The sigma-pole contribution plays the main role and
contains strong t-dependence of the effective pion polarizability at the region
. Possibilities of experimental test of this sigma-pole
effect in the reaction of Coulomb Nuclear Scattering are estimated for the
COMPASS experiment.Comment: 11 pages, 8 figure
Gaussian modeling and Schmidt modes of SPDS biphoton states
A double-Gaussian model and the Schmidt modes are found for the biphoton wave
function characterizing spontaneous parametric down-conversion with the
degenerate collinear phase-matching of the type I and with a pulsed pump. The
obtained results are valid for all durations of the pump pulses, short, long
and intermediately long
Strongly coupled quantum discrete Liouville theory. I: Algebraic approach and duality
The quantum discrete Liouville model in the strongly coupled regime, 1<c<25,
is formulated as a well defined quantum mechanical problem with unitary
evolution operator. The theory is self-dual: there are two exponential fields
related by Hermitean conjugation, satisfying two discrete quantum Liouville
equations, and living in mutually commuting subalgebras of the quantum algebra
of observables.Comment: Latex2e, 20 page
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