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Discovering Partonic Rescattering in Light Nucleus Collisions.

Alexander Huss1, Aleksi Kurkela1,2, Aleksas Mazeliauskas1

  • 1Theoretical Physics Department, CERN, CH-1211 Genève 23, Switzerland.

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|May 28, 2021
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Summary
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Oxygen-oxygen collisions at the Large Hadron Collider (LHC) offer new insights into parton energy loss. Researchers can distinguish partonic rescattering signals from the baseline by measuring charged hadron spectra.

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Area of Science:

  • High Energy Physics
  • Nuclear Physics
  • Quantum Chromodynamics

Background:

  • Investigating parton energy loss is crucial for understanding the quark-gluon plasma.
  • Peripheral heavy-ion collisions and oxygen-oxygen collisions create similar system sizes.

Purpose of the Study:

  • To leverage oxygen-oxygen collisions at the LHC for precise measurements of parton energy loss.
  • To assess the theoretical accuracy of baseline calculations and the impact of nuclear parton distribution functions.

Main Methods:

  • Utilizing leading and next-to-leading order calculations of nuclear modification factors.
  • Analyzing Z-boson normalized nuclear modification factors.
  • Studying various parton energy loss models.

Main Results:

  • Oxygen-oxygen collisions provide high sensitivity to parton energy loss.
  • The baseline in the absence of partonic rescattering is determined with up to 2% theoretical accuracy.
  • Z-boson normalization does not improve theoretical accuracy due to parton distribution function uncertainties.

Conclusions:

  • Partonic rescattering signals can be disentangled from the baseline in oxygen-oxygen collisions.
  • Measuring charged hadron spectra within 20 GeV < pT < 100 GeV is key to observing these effects.