Passage of charmed particles through the mixed phase in high-energy heavy-ion collisions

We employ a modified cascade hydrodynamics code to simulate the phase transition of an expanding quark-gluon plasma and the passage of a charmed particle through it. When inside the plasma droplets, the charmed quark experiences drag and diffusion forces. When outside the plasma, the quark travels as a $D$ meson and experiences collisions with pions. Additional energy transfer takes place when the quark enters or leaves a droplet. We find that the transverse momentum of $D$ mesons provides a rough thermometer of the phase transition.Comment: 20 pages, 9 Postscript figures included with epsfig.st

606: Charm transverse momentum as a thermometer of the quark-gluon plasma

Abstract. A charmed quark experiences drag and diffusion in the quark-gluon plasma, as well as strong interaction with the plasma surface. Our simulations indicate that charmed quarks created in heavy ion collisions will be trapped in the mixed phase and will come to equilibrium in it. Their momentum distribution will thus reflect the temperature at the confinement phase transition.

Synchrony Generation in Recurrent Networks with Frequency-Dependent Synapses

This article is published in The Journal of Neuroscience, Rapi

Charm---a Thermometer of the Mixed Phase

A charmed quark experiences drag and diffusion in the quark-gluon plasma, as well as strong interaction with the plasma surface. Our simulations indicate that charmed quarks created in heavy ion collisions will be trapped in the mixed phase and will come to equilibrium in it. Their momentum distribution will thus reflect the temperature at the confinement phase transition. Consider charm created in a high-energy nuclear collision. Some 99% of the charmed quarks created in hadronic collisions are not to be found in cc bound states, but rather in the open charm continuum. Much like their bound counterparts, the unbound charmed quarks are created early, move through the interaction region slowly, and react strongly with their environment. They should contain as much information about the collision region as the J=/, although this information may be harder to extract. Assuming invariance of the collision kinematics under longitudinal boosts [1], a spacetime picture shows that a charm..