A perturbative QCD analysis of charged-particle distributions in hadronic and nuclear collisions

Abstract

We compute the distributions of charged particles at large transverse momenta in $p\bar{p}(p)$, $pA$ and $AA$ collisions in the framework of perturbative QCD, by using collinear factorization and the modern PDFs and fragmentation functions. At the highest cms-energies the shape of the spectra measured in $p\bar{p}(p)$ collisions at large $q_T$ can be well explained. The difference between the data and the lowest-order computation is quantified in terms of a constant $K$-factor for each energy. The $K$-factor is found to systematically decrease with growing $\sqrt{s}$. Also a lower limit for the partonic transverse momentum, $p_0$, is extracted for each $\sqrt{s}$ based on the comparison with the measurements. A systematic increase of $p_0$ as a function of $\sqrt{s}$ is found. Nuclear effects in the charged-particle spectra in $pA$ and $AA$ collisions at RHIC and LHC are studied in the framework of collinear factorization by applying the EKS98 nuclear corrections to the parton distributions. The nuclear effects are shown to mostly enhance the computed spectra. A comparison with the recent PHENIX data from central and peripheral Au+Au collisions at RHIC is done.

28 pages, 21 eps-figures

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• Quenching of hadron spectra in media
• Jet Tomography of Au+Au Reactions Including Multi-gluon Fluctuations
• A Dynamical Scaling Law for Jet Tomography
• Gluon Shadowing and Hadron Production at RHIC
• High-p_T pion and kaon production in relativistic nuclear collisions
• Multiplicities and Transverse Energies in Central AA Collisions at RHIC and LHC from pQCD, Saturation and Hydrodynamics
• Multiple scattering and $p_t$-broadening at RHIC energies

Cited by in corpus (49)

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• The Fragility of High-pT Hadron Spectra as a Hard Probe
• Single inclusive particle production at high energy from HERA data to proton-nucleus collisions
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• Jet tomography
• Jet Shapes in Opaque Media
• Constraining the Physics of Jet Quenching
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• Probing the small-$x$ nuclear gluon distributions with isolated photons at forward rapidities in p+Pb collisions at the LHC
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• Through the blackness -- high p_T hadrons probing the central region of 200 AGeV Au-Au collisions
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• Pseudorapidity Asymmetry and Centrality Dependence of Charged Hadron Spectra in d+Au Collisions at $\sqrt{s_{NN}}=200$ GeV
• Flow dependence of high $p_T$ parton energy loss in heavy-ion collisions
• Energy loss in a fluctuating hydrodynamical background
• Unintegrated CCFM parton distributions and pion production in proton-proton collisions at high energies
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• Soft Open Charm Production in Heavy-Ion Collisions
• Medium-induced gluon radiation and jet quenching in heavy ion collisions
• Empirical Constraints on Parton Energy Loss in Nucleus-Nucleus Collisions at RHIC
• Expectations for dihadron correlation measurements at the LHC
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• D meson production in d+Au process using a perturbative approach
• Transverse Spectra of Hadrons in Central $AA$ Collisions at RHIC and LHC from pQCD+Saturation+Hydrodynamics and from pQCD+Energy Losses
• Statistical analysis of pQCD energy loss across system size, flavor, $\sqrt{s_{NN}}$, and $p_T$
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• From Leading Hadron Suppression to Jet Quenching at RHIC and at the LHC
• Jet energy loss due to multiple scattering in the nucleus
• Pion and Kaon Production in Nucleon - Nucleon Collisions
• Hydrodynamic model of heavy-ion collisions with low momentum components