The Phenomenology of Elastic Energy Loss

Abstract

The unexpectedly strong suppression of high p_T heavy-quarks in heavy-ion collisions has given rise to the idea that partons propagating through a medium in addition to energy loss by induced radiation also undergo substantial energy loss due to elastic collisions. However, the precise magnitude of this elastic energy loss component is highly controversial. While it is for a parton inside a medium surprisingly difficult to define the difference between elastic and radiative processes rigorously, the main phenomenological difference is in the dependence of energy loss on in-medium pathlength: in a constant medium radiative energy loss is expected to grow quadratically with pathlength, elastic energy loss linearly. In this paper, we investigate a class of energy loss models with such a linear pathlength dependence and demonstrate that they are incompatible with measured data on hard hadronic back-to-back correlations where a substantial variation of pathlength is probed. This indicates that any elastic energy loss component has to be small.

arXiv comment7 pages, 3 figures

References in corpus (27)

• Radiative energy loss and $p_{\perp }$-broadening of high energy partons in nuclei
• Reaction Operator Approach to Non-Abelian Energy Loss
• Multiple Collisions and Induced Gluon Bremsstrahlung in QCD
• Radiative energy loss of high energy quarks in finite-size nuclear matter and quark-gluon plasma
• Gluon Radiation off Hard Quarks in a Nuclear Environment: Opacity Expansion
• Multiple Parton Scattering in Nuclei: Parton Energy Loss
• Fragmentation Functions for Pions, Kaons, and Protons at Next-to-Leading Order
• Calculating Quenching Weights
• Elastic, Inelastic, and Path Length Fluctuations in Jet Tomography
• Space-time evolution of bulk QCD matter
• Wilson loops in heavy ion collisions and their calculation in AdS/CFT
• Leading-particle suppression in high energy nucleus-nucleus collisions
• Direct observation of dijets in central Au+Au collisions at sqrt(s_NN) = 200 GeV
• Energy Loss of Charm Quarks in the Quark-Gluon Plasma: Collisional vs Radiative
• Fragmentation Functions for Light Charged Hadrons with Complete Quark Flavour Separation
• Dihadron Tomography of High-Energy Nuclear Collisions in NLO pQCD
• Collisional Energy Loss in a Finite Size QCD Matter
• Prospects of medium tomography using back-to-back hadron correlations
• RHIC-tested predictions for low-$p_T$ and high-$p_T$ hadron spectra in nearly central Pb+Pb collisions at the LHC
• Stopping power of hot QCD plasma
• Towards jet tomography: gamma-hadron correlations
• How does transverse (hydrodynamic) flow affect jet-broadening and jet-quenching ?
• Jet-quenching in a 3D hydrodynamic medium
• Jet modification in three dimensional fluid dynamics at next-to-leading twist
• Through the blackness -- high p_T hadrons probing the central region of 200 AGeV Au-Au collisions
• An overview of heavy quark energy loss puzzle at RHIC
• Note on proton-antiproton suppression in 200 AGeV Au-Au collisions

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• Using Hard Dihadron Correlations to constrain Elastic Energy Loss
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• Hard dihadron correlations in heavy-ion collisions at RHIC and LHC
• Scaling patterns of the suppression of ${\pi }^0$ yields in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV: links to the transport properties of the QGP
• Empirical Constraints on Parton Energy Loss in Nucleus-Nucleus Collisions at RHIC
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