Speaker: Jiechen Xu (Columbia University)

Time: January 5th, Monday, 2:30pm

Place: Rm 9409

Title: Anisotropic Jet Quenching in semi-Quark-Gluon Plasmas with Color

Magnetic Monopoles

Abstract: In ultrarelativistic heavy-ion collisions at the CERN Large Hadron Collider (LHC) and the BNL Relativistic Heavy Ion Collider (RHIC), a color deconfined, strongly coupled Quark-Gluon Plasma (QGP) is created under extremely hot and/or dense conditions. Highly energetic partons produced in the early stage of such collisions propagate through the hot QGP medium and lose energy through strong interaction processes, results in suppssions of observed jet fragments (aka "jet quenching”, characterized by the nuclear modification factor RAA), and azimuthal anisotropies of single inclusive hadrons (mainly characterized by the elliptic moment v2). It is long standing theoretical puzzle to describe simultaneously both the high transverse momentum (pT) RAA and v2 at both RHIC and LHC energies. In this seminar, I will first give a brief overview of our approach — a perturbative Quantum Chromodynamics (pQCD) based jet energy loss model — CUJET, and talk about how it resolves the "heavy quark energy loss puzzle” and the “surprising transparency of QGP at LHC". It is found within this pQCD jet tomography model that the high pT v2 is very sensitive to the local temperature dependence of jet-medium coupling, and recently, motivated by the dual superconductivity picture of color confinement, a semi-Quark-Gluon-Monopole Plasma is imbedded into this systematic jet quenching framework. I will show how this new CUJET3.0 model solves the long standing high pT v2 puzzle and generates simultaneous descriptions of both light hadron and open heavy flavor RAA and v2 at both RHIC and LHC. I will close this talk discussing the pdictions of jet quenching observables from CUJET3.0 that can be measured in future heavy-ion experiments at RHIC and LHC.