Description
Title: Jet quenching and search for jet diffusion wake in heavy ion collisions
Abstract:
“Jet quenching” encompasses a range of physical phenomena observed in ultra-relativistic heavy ion collisions that arise from interactions between hard-scattered partons forming jets and the quark–gluon plasma (QGP). Jet-quenching signals include medium-induced modifications of jet rates and intra- and in-jet distributions, and result from the interplay of different physics processes. Complicating the picture are substantial underlying-event backgrounds and detector effects that significantly influence the interpretation of the measurements, particularly the separation of QGP effects on jets from those of jets on the medium.
Jet-medium interactions are expected to form a diffusion wake, leading to particle depletion behind the propagating jet in the QGP. Until recently, no unambiguous measurements of the wake effect existed until a theory guided a class of services anew. In this talk, I will discuss selected jet-quenching results, highlighting the interplay between mutual jet and medium modifications, and present the first experimental observation of jet-induced diffusion wake, using dijet events from 5.02 TeV PbPb collisions recorded by the CMS experiment. The experimental observation and characterization of wake properties offer new insights into jet-medium interactions in the quark-gluon plasma.
Brief introduction about the speaker:
Olga Evdokimov is a Professor of Physics and Director of Graduate Studies at the University of Illinois Chicago. She received her PhD in 1999 from the Joint Institute for Nuclear Research (Dubna, Russia) and Ivanovo State University (Ivanovo, Russia). Her research expertise is in high-energy nuclear physics, focusing on experimental exploration of phases of nuclear matter. She is conducting experimental studies of hot nuclear matter under extreme temperature conditions within two major international collaborations, STAR and CMS, at Brookhaven National Laboratory (BNL) in Upton, NY, and at the Large Hadron Collider at CERN in Geneva, Switzerland. Her research interests span a variety of subjects, including collision dynamics, hadronization mechanisms in the Quark-Gluon Plasma, and jet quenching. The focus of her recent works is on jet substructure observables and jet-medium interactions.
