Nuclear Theory Seminars at Texas A&M: Fall 2014

Location: Cyclotron Conference Room (CYCL-300)

September 19, 4:00pm
      N. Sahoo (Texas A&M University, College Station)
"Understanding QCD Phase Diagram by Event-by-Event fluctuation in heavy-ion-collisions"

Event-by-event fluctuations of global observables in relativistic heavy-ion collisions are studied as probes for the QCD phase transition and to search for critical phenomena near the phase boundary. Dynamical fluctuation in conserved quantities (such as net-charge, net-baryon) are expected to provide signatures of a deconfined state of matter. Non-monotonic behavior in the higher moments of conserved quantities as a function of beam energy are proposed as signatures of the QCD critical point. To study the QCD phase transition and locate the critical point, the STAR experiment at RHIC has collected a large amount of data for Au+Au collisions from \sqrt(s_{NN}) = 7.7 − 200 GeV in the RHIC Beam Energy Scan (BES) program. We discuss the recent beam energy results on the higher moments of net-charge and net-proton multiplicity distribution. These measurements provide a valuable tool to extract the freeze-out parameters in heavy-ion collisions by comparing with theoretical models.

October 07, 4:00pm
      S. Das (Catania University, Catania, Italy)
Heavy Quark dynamics in the Quark-Gluon Plasma : Langevin vs Boltzmann

In this talk we review the basic concepts related with the study of the dynamics of the heavy quarks in the quark-gluon plasma created in ultra-relativistic heavy-ion collisions. We discuss the relevant physical scale as well as the difficulties of the present theoretical approach to have a self-consistent description of the experimental data at both RHIC and LHC. In the second part we challenge the assumption of Brownian motion for charm quarks and compare the dynamical evolution of charm and bottom quarks in a Langevin approach with the full collisional integral within the framework of Boltzmann transport equation. We show that while for bottom the motion appears quite close to a Brownian one, this does not seems to be the case for charms quarks. In particular the solution of the full two body collision integral shows that the anisotropic flows are larger respect to those predicted by a Langevin dynamics. We have shown that using nearly isotropic cross section one can describe the suppression RAA and elliptic flow v2 simultaneously. At the end the role of the hadronic medium on heavy quark observables have been highlighted.

October 17, 4:00pm
      R. Lacey (SUNY Stony Brook)
Acousting Scaling of Anisotropic Flow in Shape-Engineered Events: Implications for Extracting eta/s (T,mu_B) of quark gluon plasma


Previous seminars

Spring 2014
Spring 2013
Spring 2012
Fall 2011
Spring 2011
Fall 2010
Spring 2010
Fall 2009
Spring 2009
Fall 2008
Spring 2008
Fall 2007
Spring 2007
Fall 2006
Spring 2006
Fall 2005
Spring 2005
Fall 2004
Spring 2004
Fall 2003

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