133 research outputs found
On predictions of the first results from RHIC
In this talk, I will discuss the predictions of the first results from RHIC:
the charged particle multiplicity , its centrality
dependence and the elliptic flow .Comment: A plenary review talk at Quark Matter 2001, Stony Brook, USA, January
2001, 10 page
Note on proton-antiproton suppression in 200 AGeV Au-Au collisions
We discuss the measured nuclear suppression of p + pbar production in 200
AGeV Au-Au collisions at RHIC within radiative energy loss. For the AKK set of
fragmentation functions, proton production is dominated by gluons, giving rise
to the expectation that the nuclear suppression for p + pbar should be stronger
than for pions due to the stronger coupling of gluons to the quenching medium.
Using a hydrodynamical description for the soft matter evolution, we show that
this is indeed seen in the calculation. However, the expected suppression
factors for pions and protons are sufficiently similar that a discrimination
with present data is not possible. In the high p_T region above 6 GeV where the
contributions of hydrodynamics and recombination to hadron production are
negligible, the model calculation is in good agreement with the data on p +
pbar suppression.Comment: 3 pages, 2 figures, slightly expanded versio
Minijets in ultrarelativistic heavy ion collisions at RHIC and LHC
Recent results on minijet production in nuclear collisions at the RHIC and LHC energies are reviewed. Initial conditions of the QGP at fm, especially parton chemistry, thermalization and net baryon number-to-entropy ratio are discussed. Also, contribution of minijets from a hard BFKL-pomeron ladder will be estimated
Hard dihadron correlations in heavy-ion collisions at RHIC and LHC
High transverse momentum (P_T) processes are considered to be an important
tool to probe and understand the medium produced in ultrarelativistic heavy-ion
collisions via the interaction of hard, perturbatively produced partons with
the medium. In this context, triggered hard dihadron correlations constitute a
class of observables set between hard single inclusive hadrons (dominated by
the leading jet fragments) and fully reconstructed jets - while they probe some
features of the perturbative QCD evolution of a parton shower in the medium,
they do not suffer from the problem of finding a suitable separation between
soft perturbative (jet-like) and soft non-perturbative (medium-like) physics as
the identification of full jets does. On the other hand, the trigger
requirement introduces non-trivial complications to the process, which makes
the medium-modification of the correlation pattern difficult and non-intuitive
to understand. In this work, we review the basic physics underlying triggered
dihadron correlations and make a systematic comparison of several combinations
of medium evolution and parton-medium interaction models with the available
data from 200 AGeV Au-Au collisions at RHIC. We also discuss the expected
results for 2.76 ATeV Pb-Pb collisions at the LHC.Comment: 13 pages, 7 figures, submitted to PR
- …