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Related Experiment Videos

Dynamical scaling law for jet tomography.

Carlos A Salgado1, Urs Achim Wiedemann

  • 1Theory Division, CERN, CH-1211 Geneva 23, Switzerland.

Physical Review Letters
|August 23, 2002
PubMed
Summary

Medium modifications in particle fragmentation offer new ways to study hot, dense matter from heavy-ion collisions. A new scaling law simplifies analysis of these complex, expanding systems.

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Area of Science:

  • High-energy nuclear physics
  • Quantum chromodynamics (QCD)
  • Heavy-ion collisions

Background:

  • Medium modifications of parton fragmentation are a novel tool for studying hot and dense matter.
  • Quantitative analysis is complicated by the strong dynamical expansion of the collision region.

Purpose of the Study:

  • Establish a scaling law for the multiple scattering induced gluon radiation spectrum.
  • Relate medium effects in dynamical expansion to static scenarios.
  • Calculate medium-modified fragmentation functions for realistic heavy-ion collisions.

Main Methods:

  • Derivation of a scaling law for gluon radiation spectrum.
  • Application of the scaling law to static scenarios.
  • Calculation of medium-modified fragmentation functions using realistic dynamical expansion.

Main Results:

  • A scaling law is established for the multiple scattering induced gluon radiation spectrum.
  • Medium effects in expanding systems are related to static scenarios.
  • Medium-modified fragmentation functions are calculated for RHIC and LHC heavy-ion collisions.

Conclusions:

  • The established scaling law simplifies the study of medium modifications in heavy-ion collisions.
  • This approach provides a novel tomographic tool for understanding the matter created in these collisions.

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