On Event-by-Event Fluctuations in Nuclear Collisions

Details On Event-by-Event Fluctuations in Nuclear Collisions On Event-by-Event Fluctuations in Nuclear Collisions

1997-11-21

arxiv.org/abs/hep-ph/9711422v2

Eur.Phys.J.C6:365-369,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages

Scientific paper

10.1007/s100520050348

We demonstrate that a new type of analysis in heavy-ion collisions, based on an event-by-event analysis of the transverse momentum distribution, allows us to obtain information on secondary interactions and collective behaviour that is not available from the inclusive spectra. Using a random walk model as a simple phenomenological description of initial state scattering in collisions with heavy nuclei, we show that the event-by-event measurement allows a quantitative determination of this effect, well within the resolution achievable with the new generation of large acceptance hadron spectrometers. The preliminary data of the NA49 collaboration on transverse momentum fluctuations indicate qualitatively different behaviour than that obtained within the random walk model. The results are discussed in relation to the thermodynamic and hydrodynamic description of nuclear collisions.

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