Abstract
In this paper, we proposed to study the phase transition process to use the new pair of variables, the temperature T and the cumulative number n c (T, n c ). We considered the transverse energy spectra of protons and π − -mesons produced in π − -C interactions at 40 GeV/c as a function of cumulative number n c (or four-dimensional momentum transfer t) and the baryonic chemical potential μ b (√ t ). Obtained results indicate the possible appearance of QCD phase transition of nuclear matter.
Highlights
Quantum chromodynamics (QCD) is the fundamental theory of the strong interaction and this is an asymptotically free theory [1,2] i. e. interactions between quarks and gluons become weaker as the mutual distance decreases or as exchanged momentum increases
During the last years the collective phenomena such as the cumulative particle production [4], the production of nuclear matter with high densities, the phase transition from the hadronic matter to the quark-gluon plasma state and color-superconductivity is widely discussed in the literature [3,4,5,6, 11,12,13,14,15,16,17]
According to the different ideas and models, if these phenomena exist in the nature, they will be observed in the hadron-nucleus and nucleus-nucleus interactions at high energies and large momentum transfers and should be influenced to the dynamics of interaction process and would be reflected in the angular and momentum characteristics of the reaction products
Summary
Quantum chromodynamics (QCD) is the fundamental theory of the strong interaction and this is an asymptotically free theory [1,2] i. e. interactions between quarks and gluons become weaker as the mutual distance decreases or as exchanged momentum increases. There is hope that the QCD phase transition processes may be realized in the hadron-nucleus and nucleus-nucleus interactions at high energies and large momentum transfers and in the astrophysical objects of very high density such as neutron stars. According to the theoretical investigations, the strongly interacting matter depending on the temperature and the density may occur in the different phases: the hadronic phase, the mixed phase (h+QGP),the quark-gluon plasma (QGP) and color-superconducting quark matter [3, 5, 11, 12, 1417]. The investigation of the multiparticle production process in hadron-nucleus and nucleus-nucleus interactions at high energies and large momentum transfers is very important for understanding the strong interaction mechanism and inner quark-gluon structure of nuclear matter. This paper is a continuation of our previous publication [6,7]
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