Quark degrees of freedom in hadronic systems

Quark degrees of freedom in hadronic systems

Quantum Chromodynamics (QCD) is the theory of the strong interactions. We review descriptions of hadronic systems motivated by QCD, analyzing the recent controversy between gluonic and bosonic degrees of freedom under the prism of the Cheshire Cat Principle. Our analysis leads to an optimal scheme to study hadronic properties. We proceed to extend this low energy descriptions to the deep inelas...

Hadronic Degrees of Freedom

The point of view I take to summarize some of the research activities in Italy in the field of hadronic physics, is determined by the (today accepted) fundamental degrees of freedom of the strong interactions, namely quarks and gluons. The Sec. 2 is devoted to the link of the fundamental theory of strong interactions, Quantum Chromodynamics (QCD), with effective degrees of freedom often used to...

Chiral Dynamics with Quark Degrees of Freedom

Possibility to detect DCC fluctuations is discussed. It is shown that interactions with quark background and dissipative effects due to interactions in the chiral field may result in damping of fluctuations. Since the magnitude of fluctuations depends strongly on the initial state and speed of chiral phase transition accurate evaluation of all modifying processes is required to predict observab...

A Model for Heavy Ion Collisions with Quark and Hadronic degrees of freedom

Charmonium Suppression – Interplay of Hadronic and Partonic Degrees of Freedom ∗

Last year the E866-group of the Fermilab measured the xF dependence of J/Ψ and Ψ ′ suppression in pA collisions. We discuss two of the effects found in that experiment with regard to color coherence effects: the different suppression of the J/Ψ and the Ψ′ at xF < 0 and the significant suppression of both at large xF . The small xF regions is dominated by fully formed charmonium states and thus ...