RHIC-tested predictions for low-$p_T$ and high-$p_T$ hadron spectra in nearly central Pb+Pb collisions at the LHC
| dc.creator | Eskola, K. J. | |
| dc.creator | Honkanen, H. | |
| dc.creator | Niemi, H. | |
| dc.creator | Ruuskanen, P. V. | |
| dc.creator | Rasanen, S. S. | |
| dc.date | 2005-06-06 | |
| dc.date.accessioned | 2026-07-07T11:58:35Z | |
| dc.date.available | 2026-07-07T11:58:35Z | |
| dc.description | We study the hadron spectra in nearly central $A$+$A$ collisions at RHIC and LHC in a broad transverse momentum range. We cover the low-$p_T$ spectra using longitudinally boost-invariant hydrodynamics with initial energy and net-baryon number densities from the perturbative QCD (pQCD)+saturation model. Build-up of the transverse flow and sensitivity of the spectra to a single decoupling temperature $\Tdec$ are studied. Comparison with RHIC data at $\ssNN=130$ and 200 GeV suggests a rather high value $\Tdec=150$ MeV. The high-$p_T$ spectra are computed using factorized pQCD cross sections, nuclear parton distributions, fragmentation functions, and describing partonic energy loss in the quark-gluon plasma by quenching weights. Overall normalization is fixed on the basis of p+$\bar{\rm p}$(p) data and the strength of energy loss is determined from RHIC Au+Au data. Uncertainties are discussed. With constraints from RHIC data, we predict the $p_T$ spectra of hadrons in 5 % most central Pb+Pb collisions at the LHC energy $\ssNN=5500$ GeV. Due to the closed framework for primary production, we can also predict the net-baryon number at midrapidity, as well as the strength of partonic energy losses at the LHC. Both at the LHC and RHIC, we recognize a rather narrow crossover region in the $p_T$ spectra, where the hydrodynamic and pQCD fragmentation components become of equal size. We argue that in this crossover region the two contributions are to a good approximation mutually independent. In particular, our results suggest a wider $p_T$-region of applicability for hydrodynamical models at the LHC than at RHIC. | |
| dc.description | 45 pages, 16 eps-figures | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0506049 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0506049 | |
| dc.identifier | Phys.Rev.C72:044904,2005 | |
| dc.identifier | doi:10.1103/PhysRevC.72.044904 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/206277 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | Nuclear Theory | |
| dc.title | RHIC-tested predictions for low-$p_T$ and high-$p_T$ hadron spectra in nearly central Pb+Pb collisions at the LHC | |
| dc.type | text |