Charged Particle and Photon Multiplicity, and Transverse Energy Production in High-Energy Heavy-Ion Collisions

Abstract

We review the charged particle and photon multiplicity, and transverse energy production in heavy-ion collisions starting from few GeV to TeV energies. The experimental results of pseudorapidity distribution of charged particles and photons at different collision energies and centralities are discussed. We also discuss the hypothesis of limiting fragmentation and expansion dynamics using the Landau hydrodynamics and the underlying physics. Meanwhile, we present the estimation of initial energy density multiplied with formation time as a function of different collision energies and centralities. In the end, the transverse energy per charged particle in connection with the chemical freeze-out criteria is discussed. We invoke various models and phenomenological arguments to interpret and characterize the fireball created in heavy-ion collisions. This review overall provides a scope to understand the heavy-ion collision data and a possible formation of a deconfined phase of partons via the global observables like charged particles, photons and the transverse energy measurement.

27 pages, 43 figures, Invited Review for Advances in High Energy physics for Special Issue on "Global properties in High Energy Collisions"

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Cited by in corpus (4)

• Predictions on global properties in O+O collisions at the Large Hadron Collider using a multi-phase transport model
• Event topology and global observables in heavy-ion collisions at the Large Hadron Collider
• Beyond the thermal model in relativistic heavy-ion collisions
• Comparing effective temperatures in standard and Tsallis distributions from transverse momentum spectra in small collision systems