Charged particle fluctuations and microscopic models of nuclear collisions

A Perturbative Qcd Analysis of Charged-particle Distributions in Hadronic and Nuclear Collisions

We compute the distributions of charged particles at large transverse momenta in pp̄(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 cmsenergies the shape of the spectra measured in pp̄(p) collisions at large qT can be well explained. The difference between the data and the lowest-order...

Microscopic Models for Ultrarelativistic Heavy Ion Collisions

Fluctuations of Particle Yield Ratios in Heavy-Ion Collisions

We study the dynamical fluctuations of various particle yield ratios at different incident energies. Assuming that the particle production yields in the hydronic final state are due to equilibrium chemical processes (γ = 1), the experimental results available so far are compared with the hadron resonance gas model (HRG) taking into account the limited momentum acceptance in heavy-ion collisions...

Correlations and fluctuations in high-energy nuclear collisions.

Nucleon correlations in the target and projectile nuclei are shown to reduce significantly the fluctuations in multiple nucleon-nucleon collisions, total multiplicity and transverse energy in relativistic heavy-ion collisions, in particular for heavy projectile and target. The interplay between cross-section fluctuations, from color transparency and opacity, and nuclear correlations is calculat...

Measurements of charged particle spectra and nuclear modification factor in p+Pb collisions with the ATLAS detector

The ATLAS detector at the LHC obtained the sample of p+Pb data at √ sNN = 5.02 TeV with integrated luminosity of 25 nb−1, which can be compared to the pp data obtained by interpolating pp measurements at √ s = 2.76 TeV and 7 TeV. Due to the excellent capabilities of the ATLAS detector, and its stable operation in heavy ion as well as proton–proton physics runs, the data allow measurements of th...