Thursday, April 11, 2013

1304.2969 (Ranbir Singh et al.)

Experimental Results from Heavy Ion Collisions at LHC    [PDF]

Ranbir Singh, Lokesh Kumar, Pawan Kumar Netrakanti, Bedangadas Mohanty
We review a subset of experimental results from the heavy-ion collisions at the Large Hadron Collider (LHC) facility at CERN. Excellent consistency is observed for various measurements like charged particle multiplicity density, second order azimuthal anisotropy and nuclear modification factor of charged hadrons across all the experiments at the LHC. Comparison to corresponding results from the collisions at lower energy (centre of mass energy, \sqrt(s_NN) = 200 GeV) at the Relativistic Heavy Ion Collider (RHIC) facility shows that system formed at LHC (\sqrt(s_NN) = 2.76 TeV) produces a larger number of particles per participating nucleon pair, attains higher energy density, has a larger system size, and lives for a longer time. Higher collision energy at LHC allows measurements to uncover interesting observations at kinematic regions in pseudorapidity and transverse momentum not previously measured in the heavy-ion collisions. Finally, we compare the LHC measurements to some model calculations to get a glimpse of the physical insight provided by these measurements.
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