Faculty of Physics - University of Bucharest

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FACULTY OF PHYSICS

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2024-11-22 1:36

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Conference: Bucharest University Faculty of Physics 2010 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

Hadron production in He-Cu, C-C, C-Cu collisions at 4.5 A GeV/c and Au-Au collisions sqrt_NN=200 GeV

Authors:

E Stan (2), C. Besliu(1), Al Jipa (1), D Felea (2), I. V. Grossu (1), T. Esanu (1)

Affiliation:

(1) Atomic and Nuclear Physics Chair, Faculty of Physics, University of Bucharest, ROMANIA

(2) Institute of Space Sciences Bucuharest-Măgurele, ROMANIA

E-mail

estan@spacescience.ro

Keywords:

nuclear collisions at high energy, effective mass, quark gluon plasma, cumulativity, Hubble time scale

Abstract:

The first evidences for the quark gluon plasma formation in relativistic nuclear collisions opened the study on the possible new hadronic production channels near to the threshold for phase formation. In this way, new dynamical aspects for different processes can be established. Comparisons of similar physical quantities on a larger energy ranges are possible.Present paper is focusing to these aspects and it is based on a phenomenological picture of nuclear reactions at these energies. Main distributions of the dynamical variables are included for all collisions at the two energies taking into account p, ,K+,K-,π+,π- hadrons productions.Particularly, cumulative effect analysis is used for check collective production in nucleus-nucleus collisions versus nucleon-nucleon collisions. Experimental cumulative number indicates a collective production specific to plasma in the case of some antiparticles as , K-, π-. The production of some exotic clusters formed by positive or/and negative hadrons is observed with a small weight over the background in the effective mass spectra. The maximum value of the effective mass decreases with the mass values when the time evolution (Fm/c scale) is near freeze-out state.A time scale inspired by the classical Hubble cosmology was also applied for the evolution of detected hadrons, both in cumulative and clusters bi-particles configurations.