184 research outputs found
Freeze out of the expanding system
The freeze out (FO) of the expanding systems, created in relativistic heavy
ion collisions, is discussed. We start with kinetic FO model, which realizes
complete physical FO in a layer of given thickness, and then combine our
gradual FO equations with Bjorken type system expansion into a unified model.
We shall see that the basic FO features, pointed out in the earlier works, are
not smeared out by the expansion.Comment: 3 pages, 2 figure
Dual Properties of the Structure Functions
By using the concept of duality between direct channel resonances and Regge
exchanges we relate the small- and large- behavior of the structure
functions. We show that even a single resonance exhibits Bjorken scaling at
large .Comment: 4 pages talk given at XXXI International Symposium on Multiparticle
Dynamics, Sep. 1-7, 2001, Datong China URL http://ismd31.ccnu.edu.cn
On the nature of the Lambda(1405) as a superposition of two states
We use recent data on the reaction with the
mass distribution of forming the with a peak
at 1420 MeV and a relatively narrow width of MeV, together with
those of the reaction to show that there are two
states instead of one as so far assumed.Comment: Contribution to the PANIC05 Conference, Santa Fe, October 200
Kinetic description of particle emission from expanding source
The freeze out of the expanding systems, created in relativistic heavy ion
collisions, is discussed. We combine kinetic freeze out equations with Bjorken
type system expansion into a unified model. The important feature of the
proposed scenario is that physical freeze out is completely finished in a
finite time, which can be varied from 0 (freeze out hypersurface) to infinity.
The dependence of the post freeze out distribution function on the freeze out
time will be studied. As an example, model is completely solved and analyzed
for the gas of pions. We shall see that the basic freeze out features, pointed
out in the earlier works, are not smeared out by the expansion of the system.
The entropy evolution in such a scenario is also studied.Comment: 8 pages, 4 figures. Accepted to Physics Letters
Modified Boltzmann Transport Equation and Freeze Out
We study Freeze Out process in high energy heavy ion reaction. The
description of the process is based on the Boltzmann Transport Equation (BTE).
We point out the basic limitations of the BTE approach and introduce Modified
BTE. The Freeze Out dynamics is presented in the 4-dimensional space-time in a
layer of finite thickness, and we employ Modified BTE for the realistic Freeze
Out description.Comment: 9 pages, 2 figure
Resonance-reggeon and parton-hadron duality in strong interactions
By using the concept of duality between direct channel resonances and Regge
exchanges we relate the small- and large- behavior of the structure
functions. We show that even a single resonance exhibits Bjorken scaling at
large .Comment: 18 pages, 7 figures, 2 style files. To be published in Eur. Phys. J.
A. Several typos are corrected, references are updated, LaTeX slyle is
change
The reaction in coupled channel chiral models up to next-to-leading order
We study the meson-baryon interaction in S-wave in the strangeness S=-1
sector using a chiral unitary approach based on a next-to-leading order chiral
SU(3) Lagrangian. We fit our model to the large set of experimental data in
different two-body channels. We pay particular attention to the reaction, where the effect of the next-to-leading order
terms in the Lagrangian are sufficiently large to be observed, since at tree
level the cross section of this reaction is zero. For these channels we improve
our approach by phenomenologically taking into account effects of the high spin
hyperonic resonances.Comment: 8 pages, 4 figures, presented at the II Russian-Spanish Congress
"Particle and Nuclear Physics at all Scales and Cosmology", Saint-Petersburg,
October 1-4, 2013. arXiv admin note: text overlap with arXiv:1311.5025; and
with arXiv:hep-ph/0505239 by other author
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