Dear Steve,
We send you some comments on the paper "Charged particle .... ":
Taking into account the idea on the possible
dependence of the total number of charged particles on the amount of
hadronic rescattering we believe that a comparison with HIJING predictions
and UrQMD predictions, respectively, because of their very different
assumptions. For example, the charged particle multiplicity predicted by
the HIJING Code is - for impact parameters in the range [0.0;17.0] Fm for
all rapidities - mch=1182+/-20.4 (mtot=2137), and the same quantity,
predicted by UrQMD Code, for the same conditions, is mch=1820 (mtot=3143).
This observation can be considered for the role of the subnucleonic
processes, too. The importance of the collision geometry can be treated in
two aspects, too. First of all, we can compare the multiplicities in the
full rapidity range and in the midrapidity range {[-2.2;+2.2]}. The
obtained values using UrQMD codes are: mch=1235.0+/-41.1,
mtot=2072.0+/-68.3, respectively. Using HIJING Code the following values
are obtained: mch =711.8+/-14.7, mtot=1230.0+/-25.4.
Therefore, a higher termalization can be supposed in the central region too. The second way
can be related to a phenomenological geometric picture of the relativistic
nuclear collisions (C.Besliu, Al.Jipa - Rev.Roum.Phys.33(1988)409,
Rom.J.Phys.37(1992); Al.Jipa - J.Phys.G: Nucl.Part.Phys.22(1996)231),
adapted for colliders (C.Besliu et al - Rom.Rep.Phys.52(8,9)(2000)). The
calculation of the participant number can be performed at each impact
parameter and compared with the simulation code predictions (Analysis Note 17).
There is a good agreement (including Table I from this paper). A comment
can be introduced on the limiting fragmentation, too. This assumption was
used to introduce
so-called "cumulative effect" (see, for example, A.M.Baldin -
Prog.Part.Nucl.Phys.IV(1980)95, C.Besliu et al - Nucl.Phys.A672(2000)446).
This effect can be related to the fluctuations and non-equilibrium
processes. Finally, a short unimportant request: after the last election
the Ministry of Research merged (jointed) with Romanian Ministry of
National Education; therefore, now we have Romanian Ministry of Education
and Research. If it is possible to complete this denomination will be
very nice for us.
Thank you!
Sincerely yours,
Alexandru JIPA
Calin BESLIU
Sorin ZGURA
Catalin RISTEA
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