18 research outputs found
Pion production in d+Au collisions at RHIC energy
We present our results on neutral pion pi0 production in pp and dAu
collisions at RHIC energy. Pion spectra are calculated in a next-to-leading
order (NLO) perturbative QCD-based model. The model includes the transverse
component of the initial parton distribution (``intrinsic kT''). We compare our
results to the available experimental data from RHIC, and fit the data with
high precision. The calculation tuned this way is repeated for the dAu
collision, and used to investigate the interplay of shadowing and multiple
scattering at RHIC. The centrality dependence of the nuclear modification
factor shows a measurable difference between different shadowing
parameterizations.Comment: Final version published in the Eur. Phys. J. ST in the Proceedings of
the Zimanyi Memorial Workshop, 2-4 July, 2007, Budapest, Hungary; 12 pages in
Latex, 6 EPS figure
Jet Tomography Studies in AuAu Collision at RHIC Energies
Recent RHIC results on pion production in AuAu collision at sqrt(s)=130 and
200 AGeV display a strong suppression effect at high p_T. This suppression can
be connected to final state effects, namely jet energy loss induced by the
produced dense colored matter. Applying our pQCD-based parton model we perform
a quantitative analysis of the measured suppression pattern and determine the
opacity of the produced deconfined matter.Comment: Talk given at European Physical Society International Europhysics
Conference on High Energy Physics HEP2003, July 17-23. 2003, in Aachen,
Germany 3 pages in LaTeX, 2 EPS figure. (Accepted for publication in European
Physical Journal C direct
Perturbative QCD Results on Pion Production in pp, pA and AA Collisions
We summarize new pQCD results on pion production in proton-proton (pp),
proton-nucleus (pA) and nucleus-nucleus (AA) collisions. Our calculation
introduces intrinsic parton transverse momentum (k_T) and is performed
effectively at next-to-leading order (NLO), applying a K factor extracted for
jet events. Two different factorization scales, Q=p_{T,jet}/2 and p_{T,jet} are
used. Experimental data in pA collisions imply a preference for the latter
choice at NLO level. We display our results at CERN SPS for AA collisions.Comment: Talk given at Budapest Workshop on Quark and Hadron Dynamics in
Relativistic Heavy Ion Collisions (BP 2002) Budapest, Hungary, 3-7 Mar 2002.
11 pages in Latex, 7 PS figure. Submitted to Heavy Ion Physic
High-p_T Pion Production in Heavy-Ion Collisions at RHIC energies
Perturbative QCD results on pion production are presented in proton-proton,
proton-nucleus and nucleus-nucleus collisions from CERN SPS up to RHIC energy.
A K_{jet}(s, p_T, Q) factor obtained from jet production is applied to perform
next-to-leading order calculations. Using the intrinsic transverse momentum
(k_T) we determined transverse momentum spectra for pions in wide energy
region. We have investigated nuclear multiscattering and the Cronin effect at
RHIC energies.Comment: Talk given at XXXII. International Symposion on Multiparticle
Dynamics (ISMD'02) Alusha, Crimea, Ukraine, 7-13 September 2002. 4 pages in
Latex, 1 PS figur
The nuclear modification factor at large rapidities
RHIC data on high-pT hadron production display strong suppression in a wide rapidity region, indicating strong induced energy loss for both transversally and longitudinally traveling partons. We investigate the interplay of energy loss and rapidity dependence in a perturbative QCD improved parton model, and estimate the opacity of the produced hot matter in AuAu collisions at energies sqrt(s) = 200 A GeV and 63 AGeV at different rapidity values. Direction-dependent suppression offers the possibility to study the geometry of the hot matter. © 2006 Elsevier B.V. All rights reserved