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Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large number of different...
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Setting Limits on Supersymmetry Using Simplified Models
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Published on: November 15, 2013

Modified dihadron fragmentation functions in hot and nuclear matter.

A Majumder1, Enke Wang, Xin-Nian Wang

  • 1Department of Physics, Duke University, Durham, North Carolina 27708, USA.

Physical Review Letters
|November 13, 2007
PubMed
Summary

Medium modification of dihadron fragmentation functions was studied in deep-inelastic scattering and heavy-ion collisions. Findings show weak nuclear suppression in DIS and mild enhancement in heavy-ion collisions, supporting partonic energy loss in dense matter.

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Area of Science:

  • High-energy nuclear physics
  • Quantum chromodynamics (QCD)
  • Parton physics

Background:

  • Medium modification of fragmentation functions impacts hadron production in nuclear environments.
  • Understanding parton interactions in dense QCD matter is crucial for interpreting experimental data.

Purpose of the Study:

  • To investigate medium modifications of dihadron fragmentation functions using a unified theoretical framework.
  • To compare theoretical predictions with experimental data from deep-inelastic scattering and heavy-ion collisions.

Main Methods:

  • Application of twist expansion framework to model dihadron fragmentation functions.
  • Analysis of gluon bremsstrahlung and multiple partonic scattering effects.
  • Comparison of theoretical results with experimental measurements of multihadron observables.

Main Results:

  • Dihadron modifications closely resemble single-hadron modifications, indicating weak nuclear suppression in DIS.
  • A mild enhancement in near-side hadron correlations is observed in heavy-ion collisions with increasing centrality.
  • Parton energy loss is identified as the key mechanism for jet modification in dense media.

Conclusions:

  • The study provides comprehensive evidence for partonic energy loss as the dominant mechanism for jet modification in deconfined and confined nuclear matter.
  • The theoretical framework successfully explains multihadron observables across different collision systems and energy regimes.