2019/01/12 by Amit Kumar, Kumar, Amit, Abhijit Majumder +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1901.03878
openalex publication_date 2019/01/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The transport coefficient q plays a pivotal role in describing the phenomenon of jet quenching in the quark-gluon plasma (QGP) produced in ultra-relativistic nucleus-nucleus collisions. It is challenging to compute this coefficient from first principles due to its non-perturbative nature. In this article, we present an ab-initio formulation of q based on the standard techniques of perturbative quantum chromodynamics (pQCD) and lattice gauge theory. We construct q by considering a leading order (LO) process where a hard parton produced from the hard scattering undergoes transverse broadening due to scatterings with the thermal medium. We do an analytic continuation to the Euclidean region and use the dispersion relation to express q in terms of series of local Field-Strength-Field-Strength (FF) operators. Each term in the series is suppressed by the hard scale q-. Finally, we compute the local operators on the quenched SU(3) lattice and present our estimates for q.