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The transverse momentum spectra of secondary η particles produced in P+P, D + Au and Au + Au interactions at $\sqrt{s_{NN}} = 200~{\rm GeV}$ at different centralities have been studied in the light of a nonextensive thermodynamical approach. The results and the possible thermodynamical insights, thus obtained, about the hadronizing process have also been discussed in detail. [ABSTRACT FROM AUTHOR]

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Copyright of Canadian Journal of Physics is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In the present study on proton–Beryllium collisions at two distinctly different energies obtained by one FERMILAB Collaboration, we attempt to focus on the unsettled controversy between the exponential models versus power law models, both of which are found to be in wide applications. The study concludes that none of them could be abandoned finally. And the resolution of the debate, the authors argue, might rest, not on the acceptance of just any one of them, but on a suitable combination of both of them, acting in the different domains of the transverse momentum values. [ABSTRACT FROM AUTHOR]

The oncoming recent data on production of J/Ψ mesons in some high energy particle and nuclear collisions are of special importance in view of the controversies centering around the so-called suppression or enhancement mechanisms for this particle-species. We will try to explain here the features of some of the basic observables on J/Ψ production with the help of an approach which has no direct links with quark–gluon plasma (QGP) considerations, but can interpret a large amount of data related to the proposed physical signatures of QGP. The final outcome, based on the present study, amounts to stating the fact that the J/Ψ production is neither suppressed nor enhanced; rather it exhibits both in our theoretical approach and also in the experimental measurements a behavior which is just as normal as many other secondaries, with only specificities of its own intrinsic quantum numbers and the very massive nature. [ABSTRACT FROM AUTHOR]

The RHIC measurements on the transverse momentum spectra of the main category of secondary particles produced in the Au + Au collisions were reported in the recent past. The combination of the phenomenological approaches we adopted provide a satisfactory, alternative framework for understanding and explaining the latest data-spurts on charged pions, kaons and the protons--antiprotons. The comparison of the performances by the contesting models on a select kind of secondary (π[SUP+]) which belongs to the most abundant variety has also been made. The impact and implications of all these have also been spelt out in the end. [ABSTRACT FROM AUTHOR]