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Title: Evolution of the Jet Opening Angle Distribution in Holographic Plasma

Abstract

We use holography to analyze the evolution of an ensemble of jets, with an initial probability distribution for their energy and opening angle as in proton-proton (pp) collisions, as they propagate through an expanding cooling droplet of strongly coupled plasma as in heavy ion collisions. We identify two competing effects: (i) each individual jet widens as it propagates and (ii) because wide-angle jets lose more energy, energy loss combined with the steeply falling perturbative spectrum serves to filter wide jets out of the ensemble at any given energy. Even though every jet widens, jets with a given energy can have a smaller mean opening angle after passage through the plasma than jets with that energy would have had in vacuum, as experimental data may indicate.

Authors:
 [1];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Center for Theoretical Physics
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1505738
Alternate Identifier(s):
OSTI ID: 1254542
Grant/Contract Number:  
SC0011090
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 21; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Rajagopal, Krishna, Sadofyev, Andrey V., and van der Schee, Wilke. Evolution of the Jet Opening Angle Distribution in Holographic Plasma. United States: N. p., 2016. Web. doi:10.1103/physrevlett.116.211603.
Rajagopal, Krishna, Sadofyev, Andrey V., & van der Schee, Wilke. Evolution of the Jet Opening Angle Distribution in Holographic Plasma. United States. doi:10.1103/physrevlett.116.211603.
Rajagopal, Krishna, Sadofyev, Andrey V., and van der Schee, Wilke. Thu . "Evolution of the Jet Opening Angle Distribution in Holographic Plasma". United States. doi:10.1103/physrevlett.116.211603. https://www.osti.gov/servlets/purl/1505738.
@article{osti_1505738,
title = {Evolution of the Jet Opening Angle Distribution in Holographic Plasma},
author = {Rajagopal, Krishna and Sadofyev, Andrey V. and van der Schee, Wilke},
abstractNote = {We use holography to analyze the evolution of an ensemble of jets, with an initial probability distribution for their energy and opening angle as in proton-proton (pp) collisions, as they propagate through an expanding cooling droplet of strongly coupled plasma as in heavy ion collisions. We identify two competing effects: (i) each individual jet widens as it propagates and (ii) because wide-angle jets lose more energy, energy loss combined with the steeply falling perturbative spectrum serves to filter wide jets out of the ensemble at any given energy. Even though every jet widens, jets with a given energy can have a smaller mean opening angle after passage through the plasma than jets with that energy would have had in vacuum, as experimental data may indicate.},
doi = {10.1103/physrevlett.116.211603},
journal = {Physical Review Letters},
number = 21,
volume = 116,
place = {United States},
year = {2016},
month = {5}
}

Journal Article:
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Cited by: 9 works
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Figures / Tables:

FIG. 1 FIG. 1: An event where two jets are produced at $x$1 = −3.0 fm, moving in the ±$x$1 directions, with the same initial energy E$^{init}_{jet}$ = 100 GeV and with the string endpoints (heavier grey curves) moving downward into the AdS bulk with initial angles σ0 = 0.025(0.01) for themore » left (right) moving jet. The colored surface is the black hole horizon in the AdS bulk; its height and color indicate the temperature as the droplet of plasma expands and cools. The droplet is circularly symmetric in the ($x$1, $x$2) plane; $x$2 is not shown. Bits of string follow the grey and blue constant-σ null rays. After the temperature drops below freeze-out (lower plane) we propagate the jet in vacuum (dashed grey null rays). The blue null rays fall into the horizon before freeze-out: energy on these trajectories is lost from the jet. As can be seen from the energy density depicted at the boundary, as the jets traverse the plasma, their opening angles increase (e.g., the jet that started with σ0 = 0.01 emerges with σ* = 0.044).« less

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