Abhijit Majumder

The Theory and Phenomenology of Perturbative QCD Based Jet Quenching

The study of the structure of strongly interacting dense matter via hard jets is reviewed. High momentum partons produced in hard collisions produce a shower of gluons prior to undergoing the non-perturbative process of hadronization. In the presence of a dense medium this shower is modified due to scattering of the various partons off the constituents in the medium. The modified pattern of the final detected hadrons is then a probe of the structure of the medium as perceived by the jet. Starting from the factorization paradigm developed for the case of particle collisions, we review the basic underlying theory of medium induced gluon radiation based on perturbative Quantum Chromo Dynamics (pQCD) and current experimental results from Deep Inelastic Scattering on large nuclei and high energy heavy-ion collisions, emphasizing how these results constrain our understanding of energy loss. This review contains introductions to the theory of radiative energy loss, elastic energy loss, and the corresponding experimental observables and issues. We close with a discussion of important calculations and measurements that need to be carried out to complete the description of jet modification at high energies at future high energy colliders.

Extracting the jet transport coefficient from jet quenching in high-energy heavy-ion collisions

Karen M. Burke, Alessandro Buzzatti, 3 Ningbo Chang, 5 Charles Gale, Miklos Gyulassy, Ulrich Heinz, Sangyong Jeon, Abhijit Majumder, Berndt Müller, Guang-You Qin, 1 Björn Schenke, Chun Shen, Xin-Nian Wang, 2 Jiechen Xu, Clint Young, and Hanzhong Zhang Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA Nuclear Science Division, MS 70R0319, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Department of Physics, Columbia University, New York 10027, USA School of Physics, Shandong University, Jinan, Shandong 250100, China Institute of Particle Physics and Key Laboratory of Quarks and Lepton Physics (MOE), Central China Normal University, Wuhan 430079, China Department of Physics, McGill University, 3600 University Street, Montreal, Quebec, H3A 2T8, Canada Department of Physics, The Ohio State University, Ohio 43210, USA Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

Systematic comparison of jet energy-loss schemes in a realistic hydrodynamic medium

We perform a systematic comparison of three different jet energy-loss approaches. These include the Armesto-Salgado-Wiedemann scheme based on the approach of Baier-Dokshitzer-Mueller-Peigne-Schiff and Zakharov (BDMPS-Z/ASW), the higher twist (HT) approach and a scheme based on the Arnold-Moore-Yaffe (AMY) approach. In this comparison, an identical medium evolution will be utilized for all three approaches: this entails not only the use of the same realistic three-dimensional relativistic fluid dynamics (RFD) simulation, but also the use of identical initial parton-distribution functions and final fragmentation functions. We are, thus, in a unique position to not only isolate fundamental differences between the various approaches but also make rigorous calculations for different experimental measurements using state of the art components. All three approaches are reduced to versions containing only one free tunable parameter, this is then related to the well-known transport parameter

Comparison of jet quenching formalisms for a quark-gluon plasma brick

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Extending soft collinear effective theory to describe hard jets in dense QCD media

. We find that the parameters of all three calculations can be adjusted to provide a good description of inclusive data on

Longitudinal broadening of quenched jets in turbulent color fields.

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Hard collinear gluon radiation and multiple scattering in a medium

vs transverse momentum. However, we do observe slight differences in their predictions for the centrality and azimuthal angular dependence of

Calculating the jet quenching parameter q̄ in lattice gauge theory

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Energy and momentum deposited into a QCD medium by a jet shower

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A comparative study of jet-quenching schemes

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