1,935 research outputs found
Colour strings vs. hard pomeron in perturbative QCD
Average multiplicities and transverse momenta in AA collisions are studied in
the soft and hard regions, in fusing string and perturbative QCD scenarios
respectively. Striking similarities are found between the predictions of the
two approaches. Multiplicities per string and average p_t^2 are found to,
respectively, drop and rise with A in a very similar manner, so that their
product is nearly a constant. In both approaches total multiplicities grow as
A, that is as the number of participants. The high tail of the p_t distribution
is found to behave as A^1.1 in the perturbative QCD scenario.Comment: 10 pages, 8 figure
- dependence of the flow coefficients for pp collisions in the color string scenario. Monte-Carlo simulations
In the color string picture with fusion and percolation the dependence of the
flow coefficients on the transverse momentum is studied for pp collisions
the LHC energy respectively. Monte-Carlo simulations are used to locate simple
strings and their fused clusters. The results favorably agree with the CMS data
in the region GeV/c appropriate for the string scenario.Comment: 10 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1407.459
Fusion of strings vs. percolation and the transition to the quark-gluon plasma
In most of the models of hadronic collisions the number of exchanged colour
strings grows with energy and atomic numbers of the projectile and target. At
high string densities interaction between them should melt them into the
quark-gluon plasma state. It is shown that under certain assumptions about the
the string interaction, a phase transition to the quark gluon plasma indeed
takes place in the system of many colour strings. It may be of the first or
second order (percolation), depending on the particular mechanism of the
interaction. The critical string density is about unity in both cases. The
critical density may have been already reached in central Pb-Pb collisions at
158 A GeV.Comment: 16 pages, 3 Postscript figure
Elliptic and triangular flows in dAu collisions at 200 GeV in the fusing color string model
In the color string picture with fusion and percolation the elliptic and
triangular flows are studied for p-Au and d-Au collisions at 200 GeV. The
ordering observed experimentally for central collisions
is reproduced.The calculated elliptic flow at central collisions agrees
satisfactorily with thedata. The triangular flow is found to be greater
than the experimental values, similar to the resultsobtained in the approach
based on the Color Glass Condensate initial conditions with
subsequenthydrodynamical evolution.Comment: 7 pages 3 picture
Multiplicity fluctuations in the string clustering approach
We present our results on multiplicity fluctuations in the framework of the
string clustering approach. We compare our results --with and without
clustering formation-- with CERN SPS NA49 data. We find a non-monotonic
behaviour of these fluctuations as a function of the collision centrality,
which has the same origin as the observed fluctuations of transverse momentum:
the correlations between the produced particles due to the cluster formation.Comment: 16 pages, 4 figures, revte
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