269 research outputs found
Direct Instantons in QCD Nucleon Sum Rules
We study the role of direct (i.e. small-scale) instantons in QCD correlation
functions for the nucleon. They generate sizeable, nonperturbative corrections
to the conventional operator product expansion, which improve the quality of
both QCD nucleon sum rules and cure the long-standing stability problem, in
particular, of the chirally odd sum-rule.Comment: 10 pages, UMD PP#93-17
Where the excess photons and dileptons in SPS nuclear collisions come from?
Recently the first single photon spectra from CERN energy heavy-ion
collisions were reported by WA80, while NA34/3 and NA38 have obtained the
spectra for dileptons with the mass up to 4-5 GeV. The production rates for
photons and dileptons significantly increase when reactions involving the
meson are included. However, with the conventional expansion scenario, the
absolute yields are still significantly smaller than the observed ones. It may
indicate that expansion in the ``mixed state" takes much more time
Quark Propagation in the Random Instanton Vacuum
This is the first of a series of papers devoted to a systematic study of QCD
correlation functions in a framework of 'instanton vacuum' models. The topic of
this paper is to work out approximate formulae for quark propagators in a
multi-instanton environment. As an application, and also as a necessary step
toward understanding the correlation functions, we study the propagators of
scalar and spinor quarks, using the simplest possible model, the so called
'random instanton vacuum' (RIV). Results related to heavy-light mesons, are
found to be very consistent with phenomenology.Comment: 25 pages + 4 figures available upon request, SUNY-NTG-92/3
Equation of State, Flow, Fluctuations and suppression
Radial flow observed at AGS/SPS energies is very strong, with collective
velocities of matter reaching about 0.5c for central collisions of the heaviest
ions. The lattice-based Equation of State (EOS) is however rather soft, due to
the QCD phase transition. We show that both statements are consistent only if
proper kinetic-based treatment of the freeze-out is made. In fact chemical and
thermal freeze-out happen at quite different conditions, especially at SPS.
Event-by-event fluctuations can shed new light on this problem. We also propose
new model of "anomalous" suppression found for PbPb collisions,
related it to prolonged lifetime of dense matter due the "softest point" of the
EOS.Comment: Plenary Talk at Quark Matter 97, Tsukuba, Dec.199
Random matrix theory and spectral sum rules for the Dirac operator in QCD
We construct a random matrix model that, in the large limit, reduces to
the low energy limit of the QCD partition function put forward by Leutwyler and
Smilga. This equivalence holds for an arbitrary number of flavors and any value
of the QCD vacuum angle. In this model, moments of the inverse squares of the
eigenvalues of the Dirac operator obey sum rules, which we conjecture to be
universal. In other words, the validity of the sum rules depends only on the
symmetries of the theory but not on its details. To illustrate this point we
show that the sum rules hold for an interacting liquid of instantons. The
physical interpretation is that the way the thermodynamic limit of the spectral
density near zero is approached is universal. However, its value, the
chiral condensate, is not.Comment: 18 pages, SUNY-NTG-92/4
Mesonic Correlation Functions in the Random Instanton Vacuum
A general model-independent discussion of mesonic correlation functions is
given. We derive new inequalities, including one stronger than Weingarten's
inequality. Mesonic correlation functions are calculated in the random
instanton vacuum and are compared with phenomenological expectations and
lattice results. Both diagonal and non-diagonal correlators of all strange and
light flavored currents, as well as the most important unflavored ones are
considered. Our results are used to extract the masses and the coupling
constants of the corresponding mesons. Not only the qualitative behaviour is
reproduced in all channels, but in several channels the model works with
amazing accuracyComment: 43 pages + 9 figures available upon request, SUNY-NTG-92/4
Toward the Semiclassical Theory of the High Energy Heavy Ion Collisions
Sudden deposition of energy at the early stage of high energy heavy ion
collisions makes virtual gluon fields real.
The same is true for virtual vacuum fields the topological barrier,
excited to real states or the barrier, gluomagnetic clusters of
particular structure related to the of the electroweak theory.
Semiclassically, these states play the role of the {\em ``turning points''}.
After being produced they explode into a spherical shell of coherent field
which then turn into several outgoing gluons. Furthermore, this explosions
promptly produce quark pairs, as seen from explicit solution of the Dirac
equation.
The masses of such clusters depend on their size, and are expected to peak at
. After we briefly review those consepts in a non-technical
manner, we discuss what observable consequences the production of such clusters
would make in the context of heavy ion collisions, especially at the RHIC
energies. We discuss entropy and especially quark production, event-by-event
fluctuations in collective effects like radial and elliptic flows and
suppression. Coherent fields and their geometry increase the jet quenching, and
we also point out the existene of ``explosive edge'' which jump-start
collective effects and may affect unusual phenomena seen at RHIC at large
.Comment: Third version, substantially changed adding new sections and
eliminating large part on jet quenching of the paper which brunched into a
separate pape
Do Instantons and Strings Cluster when the Number of Colors is Large?
We consider the limit of QCD using a toy model in which
instantons exchange color-singlet scalar fields which do not self-interact. Our
main observation is that collective attraction leads the formation of large
clusters containing nonperturbative objects. We further show that this
clustering of instantons is limited due to a non-trivial repulsion inherent in
the ADHM multi-instanton solution. As a result the vacuum is very different
from that at low , notably being more inhomogeneous, in ways which will
affect chiral symmetry breaking of light quarks. We also briefly discuss a
similar phenomenon for color strings in baryons made of medium-mass
(charm-like) quarks.Comment: 10 pages, 1 figure, uses epsf.st
Semileptonic D decay into scalar mesons: a QCD sum rule approach
Semileptonic decays of D-mesons into scalar hadronic states are investigated.
Two extreme cases are considered: a) the meson decays directly into an
uncorrelated scalar state of two two mesons and b) the decay proceeds via
resonance formation. QCD sum rules including instanton contributions are used
to calculate total and differential decay rates under the two assumptions.Comment: 18 pages, 9 figures, e-mail: [email protected]
Pressure of the Standard Model Near the Electroweak Phase Transition
We extend our previous determination of the thermodynamic pressure of the
Standard Model so that the result can be applied down to temperatures
corresponding to the electroweak crossover. This requires a further resummation
which can be cleanly organised within the effective theory framework. The
result allows for a precise determination of the expansion rate of the Universe
for temperatures around the electroweak crossover.Comment: 16 pages, 6 figures. v2: published versio
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