Medium response in JEWEL and its impact on jet shape observables in heavy ion collisions : arXiv

Kunnawalkam Elayavalli, Raghav; Zapp, Korinna Christine

Article
Report number	CERN-TH-2017-146 ; MCNET-17-11 ; arXiv:1707.01539
Title	Medium response in JEWEL and its impact on jet shape observables in heavy ion collisions
Author(s)	Kunnawalkam Elayavalli, Raghav ; Zapp, Korinna Christine
Imprint	2017-07-05. - 23 p.
Note	23 pages, 16 figures
Subject category	hep-ph ; Particle Physics - Phenomenology
Abstract	Realistic modeling of medium-jet interactions in heavy ion collisions is becoming increasingly important to successfully predict jet structure and shape observables. In JEWEL, all partons belonging to the parton showers initiated by hard scattered partons undergo collisions with thermal partons from the medium, leading to both elastic and radiative energy loss. The recoiling medium partons carry away energy and momentum from the jet. Since the thermal component of these recoils' momenta is part of the soft background activity, comparison with data requires the implementation of a subtraction procedure. We present two independent procedures through which background subtraction can be performed and discuss the impact of the medium recoil on jet shape observables. Keeping track of the medium response significantly improves the JEWEL description of jet shape measurements.
Copyright/License	License

$Smearing introduced by the grid on the jets, quantized by the smearing in jet $\pt$ (top left) and the absolute shift of the jet axis in the $\eta-\phi$ plane (top right) shown as a function of the particle jet $\pt$. Bottom plots show the relative shifts in jet $\eta$ (left) and $\phi$ (right), shown as a function of the respective particle jet $\eta$ and $\phi$. (Note that the log scales on the z axis span six orders of magnitude.)$ $Smearing introduced by the grid on the jets, quantized by the smearing in jet $\pt$ (top left) and the absolute shift of the jet axis in the $\eta-\phi$ plane (top right) shown as a function of the particle jet $\pt$. Bottom plots show the relative shifts in jet $\eta$ (left) and $\phi$ (right), shown as a function of the respective particle jet $\eta$ and $\phi$. (Note that the log scales on the z axis span six orders of magnitude.)$ $Smearing introduced by the grid on the jets, quantized by the smearing in jet $\pt$ (top left) and the absolute shift of the jet axis in the $\eta-\phi$ plane (top right) shown as a function of the particle jet $\pt$. Bottom plots show the relative shifts in jet $\eta$ (left) and $\phi$ (right), shown as a function of the respective particle jet $\eta$ and $\phi$. (Note that the log scales on the z axis span six orders of magnitude.)$ Show more plots

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