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We developed a new "quantile" analysis to study how jets change in quark-gluon plasma. This method helps overcome challenges in measuring jet energy loss, providing a clearer understanding of particle interactions.

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Area of Science:

  • High-energy nuclear physics
  • Quantum chromodynamics
  • Particle physics

Background:

  • Jet modification studies typically compare heavy-ion collisions to proton-proton baselines at the same transverse momentum (p_{T}).
  • Jet quenching causes p_{T} migration, complicating direct measurement of energy loss.
  • Existing methods face challenges in accurately inferring jet energy loss mechanisms.

Purpose of the Study:

  • Introduce a novel "quantile" analysis strategy for studying jet modification in quark-gluon plasma.
  • Mitigate the effects of p_{T} migration in heavy-ion collision analyses.
  • Provide a complementary method for investigating jet energy loss.

Main Methods:

  • Jets in heavy-ion collisions are matched to equivalent energy jets in proton-proton collisions using a quantile-based procedure.
  • The fractional energy loss is analyzed as a function of jet p_{T} (Q_{AA}).
  • An event generator is used to validate the correlation between parton p_{T} and quantile-matched vacuum jet p_{T} (p_{T}^{quant}).

Main Results:

  • The quantile analysis provides a natural observable for fractional energy loss (Q_{AA}).
  • A strong correlation is confirmed between the initiating parton's p_{T} and the quantile-matched vacuum jet p_{T}.
  • The strategy effectively mitigates the impact of p_{T} migration.

Conclusions:

  • The quantile analysis offers a robust method for studying jet modification in heavy-ion collisions.
  • This approach enhances the understanding of jet-medium interactions and energy loss mechanisms.
  • The method provides a valuable alternative for analyzing experimental data.