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Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
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Color reconnection and flowlike patterns in pp collisions.

A Ortiz Velasquez1, P Christiansen, E Cuautle Flores

  • 1Lund University, Department of Physics, Division of Particle Physics, Box 118, SE-221 00 Lund, Sweden.

Physical Review Letters
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The PYTHIA 8 simulation shows flow-like effects in proton-proton collisions. This is caused by color reconnection between partons in multiple hard subcollisions, mimicking particle flow.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • The Large Hadron Collider (LHC) data increasingly suggests the possibility of collective flow in proton-proton (pp) collisions.
  • Understanding the underlying mechanisms of particle production in pp collisions is crucial for interpreting experimental results.

Purpose of the Study:

  • To investigate the phenomenon of flow-like effects in pp collisions simulated by PYTHIA 8.
  • To determine if color reconnection in PYTHIA 8 can explain these observed flow-like effects.

Main Methods:

  • Utilized the PYTHIA 8 event generator to simulate pp collisions at 7 TeV.
  • Studied identified hadron observables in minimum bias and multiplicity-selected events.
  • Compared events with and without color reconnection to isolate its contribution to flow-like effects.

Main Results:

  • PYTHIA 8 demonstrates flow-like effects in pp collisions with multiple hard subcollisions.
  • Color reconnection, specifically color string formation between partons from independent scatterings, is identified as the source of these effects.
  • The study quantifies these effects on different identified hadron observables.

Conclusions:

  • Color reconnection in PYTHIA 8 is a significant mechanism that can generate flow-like effects in pp collisions.
  • These findings provide a potential explanation for observed flow phenomena in experimental data.
  • Further studies are needed to fully understand the implications for LHC physics.