RHIC-tested predictions for low-p() and high-p() hadron spectra in nearly central Pb + Pb collisions at the CERN LHC
Jun, 200546 pages
Published in:
- Phys.Rev.C 72 (2005) 044904
e-Print:
- hep-ph/0506049 [hep-ph]
Report number:
- HIP-2005-24-TH
Citations per year
Abstract:
We study the hadron spectra in nearly central + collisions at RHIC and LHC in a broad transverse momentum range. We cover the low- 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- 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+(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 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 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 -region of applicability for hydrodynamical models at the LHC than at RHIC.- 24.85.+p
- 25.75.Nq
- 12.38.Bx
- 24.10.NZ
- scattering: heavy ion
- lead
- gold
- hadron: multiple production
- central region
- transverse momentum: spectrum
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