Large momenta fluctuations of charm quarks in the Quark-Gluon Plasma⋆
Laboratorio Nazionale del Sud, Istituto Nazionale di Fisica Nucleare, Via S. Sofia 44, I-95123, Catania, Italy
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Accepted: 10 December 2005
Published online: 27 December 2005
We show that large fluctuations of D-mesons kinetic-energy (or momentum) distributions might be a signature of a phase transition to the Quark-Gluon Plasma (QGP). In particular, a jump in the variance of the momenta or kinetic energy, as a function of a control parameter (temperature or Fermi energy at finite baryon densities) might be a signature for a first-order phase transition to the QGP. This behavior is completely consistent with the order parameter defined for a system of interacting quarks both at zero temperature (and finite baryon densities) or at finite temperatures which shows a jump in correspondence with a first-order phase transition to the QGP. The J/Ψ displays exactly the same behavior of the order parameter and of the variance of the D-mesons. We discuss implications for relativistic heavy-ion collisions within the framework of a transport model and possible hints for experimental search.
PACS: 12.39.Pn Potential models – / 24.85.+p Quarks, gluons, and QCD in nuclei and nuclear processes –
© Società Italiana di Fisica and Springer-Verlag, 2006