8,994 research outputs found
Slow cross-symmetry phase relaxation in complex collisions
We discuss the effect of slow phase relaxation and the spin off-diagonal
-matrix correlations on the cross section energy oscillations and the time
evolution of the highly excited intermediate systems formed in complex
collisions. Such deformed intermediate complexes with strongly overlapping
resonances can be formed in heavy ion collisions, bimolecular chemical
reactions and atomic cluster collisions. The effects of quasiperiodic energy
dependence of the cross sections, coherent rotation of the hyperdeformed
intermediate complex, Schr\"odinger cat states and
quantum-classical transition are studied for Mg+Si heavy ion
scattering.Comment: 10 pages including 2 color ps figures. To be published in Physics of
Atomic Nuclei (Yadernaya fizika
Electron Spectral Functions of Reconstructed Quantum Hall Edges
During the reconstruction of the edge of a quantum Hall liquid, Coulomb
interaction energy is lowered through the change in the structure of the edge.
We use theory developed earlier by one of the authors [K. Yang, Phys. Rev.
Lett. 91, 036802 (2003)] to calculate the electron spectral functions of a
reconstructed edge, and study the consequences of the edge reconstruction for
the momentum-resolved tunneling into the edge. It is found that additional
excitation modes that appear after the reconstruction produce distinct features
in the energy and momentum dependence of the spectral function, which can be
used to detect the presence of edge reconstruction.Comment: RevTeX, 5 pages, 4 figures; replaced with the published version;
journal reference adde
Direct X(3872) production in e+e- collisions
Direct production of the charmonium-like state in
collisions is considered in the framework of the vector meson dominance model.
An order-of-magnitude estimate for the width is found to
be 0.03 eV. The same approach applied to the charmonium
decay predicts the corresponding width of the order 0.1 eV in agreement with
earlier estimates. Experimental perspectives for the direct production of the
charmonia in collisions are briefly discussed.Comment: LaTeX2e, 11 pages, 1 figure, version published in Phys.Lett.
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