Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268

Thu., August 22, 2013, at 3:00 PM (refreshments served at 2:40 PM)

Understanding Jet Energy Loss in Heavy Ion Collisions

Donato Giorgio Torrieri, Columbia University, NY
ORNL, Bldg. 6008 Large Conference Room

Heavy ion nuclear physics creates the hottest, densest matter ever experimentally explored. After giving an overview of jet energy loss in heavy ion collisions, I will argue that, while the phenomenon is conclusively established experimentally, its potential as a tomographic probe of the properties of the medium is still not realized. This would require a systematic investigation of which of the many different models proposed (weakly coupled thin-plasma, weakly coupled thick plasma, AdS/CFT, etc.) are closest to a realistic description of jet-medium interactions. I will show that to achieve this, one would need to develop a "generalized parton energy loss model" capable of incorporating the key features of the above models as variable parameters, and combine this model with a description of the expanding medium which is both "realistic" and capable of capturing event-by-event physics. I will describe how the Computational Jet Tomography project, using the OLCF Titan supercomputer, can be used to achieve this. In particular, the project makes use of an efficient simulation of relativistic hydrodynamics using graphics cards (GPUs) such as those available on Titan.

Host: Ken Read, Contact: Alfredo Galindo-Uribarri (uribarr@ornl.gov)