Produção de estranheza em colisões de ions pesados relativisticos / Strangeness production in relkativistic heavy ion collisions

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Relativistic heavy-ion collisions allow us to study the behavior of nuclear matter at extreme conditions of temperature and energy density. In these conditions, we expect a phase transition of matter where a free state of quarks and gluons would be formed, and that is known as Quark-Gluon Plasma (QGP). With the aim to study this new state of matter and its features, the STAR experiment was built at BNL (Brookhaven National Laboratory), New York. The STAR experiment measures many observables of heavy-ion collisions and in particular, the strangeness enhancement in QGP is of special interest. The aim of this work was the study of multi-strange baryon production, X and W , at collisions of Cu+Cu in the center of mass energy of 62.4 GeV=A measured at the STAR experiment. Transverse momentum spectra and integrated yields for X and W at mid-rapidity are presented in this work. We also compared Cu+Cu and Au+Au systems in order to study the dependence of strange particle production with the system size. The results showed that strangeness production enhances with the system size, and strange baryons yields in Cu+Cu are slightly larger than Au+Au for the same energy. The new results obtained here complement a systematic study of strangeness production in heavy ion collisions and are important to understand the strangeness particle production mechanism in different energies

ASSUNTO(S)

particulas elementares experimento star strangeness (nuclear physics) plasma de quarks e gluons star experiment fisica nuclear relativistic heavy ion collider elementary particles colisor relativistico de ions pesados quark-gluon plasma particulas estranhas (fisica nuclear) nuclear physics

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