Jet Evolution in a Dense Quark-Gluon Plasma
A main goal of the experimental program at the Large Hadron Collider is the study of the quark-gluon plasma (QGP), a new phase of nuclear matter that exists at high temperature or density, and in which the quarks and gluons are deconfined. This state of matter is produced in the intermediate stages of the high-energy nucleus-nucleus (Pb-Pb) collisions, but only for a very short time, of about 10 fermi. When a jet is produced in this dense environment, its interactions with the surrounding medium lead to modifications in the structure of the jet, known as jet quenching. By observing these modifications, one can infer important information about the QGP. Over the last years, an effective theory for jet quenching has been constructed from first principles. This describes the collisions between the partons in the jet and those in the plasma, and the consequences of these collisions in terms of medium-induced radiation and energy loss by the jet. In my talk, I will pedagogically survey this effective theory and present some of its consequences for the phenomenology at the LHC.
SpeakerDr. Edmond Iancu obtained his PhD in 1994 at the Institut de Physique de Saclay, under the supervision of Jean-Paul Blaizot. He has been a permanent researcher at CNRS (working at IPhT Saclay) since 1995. He was a Fellow at CERN in 1999-2001 and an invited Professor at TPI Minneapolis (in 1998) and then at CERN (2010-11). His research interests include (1) Physics of the quark-gluon plasma (transport properties, Hard Thermal Loops, resummation of the thermodynamics), (2) QCD at high energy: gluon saturation, Colour Glass Condensate, JIMWLK equation, (3) Jet quenching in nucleus-nucleus collisions (jet evolution in a dense QGP), and (4) AdS/CFT correspondence: applications to high-energy scattering and with jet quenching.