Jet Quenching in Heavy-Ion Collisions : Probing the Perfect Liquid

Event Dates: 

Monday, February 29, 2016 - 4:00pm

CTQM Seminar Type: 

  • Related Seminar Series

Speaker Name(s): 

Aaron Angerami

Speaker Affiliation(s): 

Columbia University

Abstract, Event Details: 

Relativistic heavy-ion collisions produce matter at the highest temperatures accessible in the laboratory. Results from the RHIC experiments show that the system produced in these collisions behaves like a near-perfect fluid. These observations indicate that strong-coupling dynamics dominate the long wavelength behavior of the system and are in surprising contrast to initial expectations that system would form a weakly-coupled plasma. This exciting discovery has led to a number of questions about the nature of strongly coupled quantum systems and how such behavior can emerge from a theory possessing asymptotic freedom. Another discovery of the RHIC program was the observation of jet quenching, where energetic partons produced in the early stages of the collisions lose energy though their interactions with the medium. Jets probe the medium at a variety of length scales and are thus sensitive to both its microscopic structure and the onset of the strong coupling. In this colloquium I will present the latest LHC jet measurements performed with the ATLAS experiment, in which precision techniques developed in high energy physics have been adapted to the heavy-ion environment. I will discuss the rapidly improving theoretical picture of jet quenching, the implications of new measurement capabilities during the next lead ion runs at the LHC, and the role of a future detector to measure jets at RHIC.