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The SuperChic 3 generator now simulates exclusive particle production in heavy ion collisions. This update includes new predictions for processes like axion production and W loops, crucial for LHC physics research.

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Particle Physics

Background:

  • Exclusive particle production is crucial for understanding fundamental interactions.
  • Previous Monte Carlo event generators lacked a unified approach for heavy ion collisions.
  • Accurate theoretical predictions are needed to interpret experimental data from the Large Hadron Collider (LHC).

Purpose of the Study:

  • To update the SuperChic 3 Monte Carlo event generator for central exclusive production.
  • To extend its capabilities to include heavy ion (pA and AA) beams for both photon and QCD-initiated processes.
  • To provide a unified framework for simulating exclusive processes in a single generator.

Main Methods:

  • Development of a theory for the gap survival factor in heavy ion collisions.
  • Derivation of results for the A scaling of cross sections in heavy ion collisions.
  • Comparison of theoretical predictions with recent experimental measurements from ATLAS and CMS at the LHC.

Main Results:

  • The updated SuperChic 3 generator successfully incorporates heavy ion collisions.
  • A theory for the gap survival factor in heavy ion collisions was developed, yielding straightforward A scaling results.
  • Background from QCD-initiated production for light-by-light scattering is found to be very small.
  • New photon-initiated processes, including axion-like particle production and W loops, can now be generated.

Conclusions:

  • The SuperChic 3 generator offers a unified approach to exclusive processes in both proton-proton and heavy ion collisions.
  • The updated model provides crucial predictions for interpreting LHC data, particularly for light-by-light scattering.
  • The generator's new capabilities open avenues for exploring new physics phenomena, such as axion-like particles and exotic states.