14,419 research outputs found
Chiral Perturbation Theory and the Strong Interaction
We have calculated the potentials of the heavy (charmed or bottomed)
pseudoscalar mesons up to with the heavy meson chiral
perturbation theory. We take into account the contributions from the football,
triangle, box, and crossed diagrams with the 2 exchange and one-loop
corrections to the contact terms. We notice that the total 2-exchange
potential alone is attractive in the small momentum region in the channel
, , or , while repulsive in the channel .
Hopefully the analytical chiral structures of the potentials may be useful in
the extrapolation of the heavy meson interaction from lattice QCD simulation.Comment: 14 pages, 8 figures, 4 tables; discussion extended, references added,
version published in Phys. Rev.
Signature of the +jet and dijet production mediated by an excited quark with QCD next-to-leading order accuracy at the LHC
We present a detailed study of the production and decay of the excited quark
at the QCD next-to-leading order (NLO) level at the Large Hadron Collider,
using the narrow width approximation and helicity amplitudes method. We find
that the QCD NLO corrections can tighten the constraints on the model
parameters and reduce the scale dependencies of the total cross sections. We
discuss the signals of the excited quark production with decay mode
and , and present several
important kinematic distributions. Moreover, we give the upper limits of the
excited quark excluded mass range and the allowed parameter space for the
coupling constants and the excited quark mass.Comment: 20 pages, 13 figures; version published in PR
Chess-Board-Like Spatio-Temporal Interference Patterns and Their Excitation
We discover new type of interference patterns generated in the focusing
nonlinear Schr\"odinger equation (NLSE) with localised periodic initial
conditions. At special conditions, found in the present work, these patterns
exhibit novel chess-board-like spatio-temporal structures which can be observed
as the outcome of collision of two breathers. The infinitely extended
chess-board-like patterns correspond to the continuous spectrum bands of the
NLSE theory. More complicated patterns can be observed when the initial
condition contains several localised periodic swells. These patterns can be
observed in a variety of physical situations ranging from optics and
hydrodynamics to Bose-Einstein condensates and plasma.Comment: 6 pages, 5 figure
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