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Vacuumlike Jet Fragmentation in a Dense QCD Medium.

P Caucal1, E Iancu1, A H Mueller2

  • 1Institut de Physique Théorique, Université Paris-Saclay, CNRS, CEA, F-91191 Gif-sur-Yvette, France.

Physical Review Letters
|June 23, 2018
PubMed
Summary
This summary is machine-generated.

We studied how jets fragment in a dense quark-gluon plasma. Our findings show in-medium parton showers differ from vacuum ones, impacting jet fragmentation functions and aligning with LHC data.

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Area of Science:

  • High-energy particle physics
  • Quantum Chromodynamics (QCD)

Background:

  • Understanding the behavior of jets in dense media is crucial for interpreting experimental data from particle colliders.
  • Quark-gluon plasma (QGP) is a state of matter formed at extreme temperatures and densities.

Purpose of the Study:

  • To investigate the fragmentation of jets traversing a dense quark-gluon plasma.
  • To calculate the impact of medium-induced scatterings on multiple parton emissions within jets.

Main Methods:

  • Utilizing a leading, double-logarithmic approximation within perturbative Quantum Chromodynamics (pQCD).
  • Computing the effects of medium interactions on vacuum-like emissions in jets.

Main Results:

  • In-medium parton showers exhibit reduced phase-space compared to vacuum showers.
  • The first emission outside the quark-gluon plasma can violate the typical angular ordering observed in vacuum.
  • The computed jet fragmentation function shows qualitative agreement with measurements from the Large Hadron Collider (LHC).

Conclusions:

  • Medium effects significantly alter jet fragmentation dynamics.
  • The theoretical framework provides a valuable tool for analyzing jet physics in heavy-ion collisions.
  • The results offer insights into the properties of the quark-gluon plasma.