Revealing the source of the radial flow patterns in proton-proton collisions using hard probes

Antonio Ortiz, G. Bencédi, Héctor Bello

Research output: Contribution to journalArticle

15 Citations (Scopus)


In this work, we propose a tool to reveal the origin of the collective-like phenomena observed in proton-proton collisions. We exploit the fundamental difference between the underlying mechanisms, color reconnection and hydrodynamics, which produce radial flow patterns in Pythia 8 and Epos 3, respectively. Specifically, we proceed by examining the strength of the coupling between the soft and hard components which, by construction, is larger in Pythia 8 than in Epos 3. We study the transverse momentum (pτ) distributions of charged pions, kaons and (anti) protons in inelastic pp collisions at TeV produced at √ s = 7 Te V mid-rapidity. Specific selections are made on an event-by-event basis as a function of the charged particle multiplicity and the transverse momentum of the leading jet (pT jet) reconstructed using the FastJet algorithm at mid-pseudorapidity (|≠| < 1). From our studies, quantitative and qualitative differences between Pythia 8 and Epos 3 are found in the pTspectra when (for a given multiplicity class) the leading jet pTis increased. In addition, we show that for low-multiplicity events the presence of jets can produce radial flow-like behavior. Motivated by our findings, we propose to perform a similar analysis using experimental data from RHIC and LHC.

Original languageEnglish
Article number065001
JournalJournal of Physics G: Nuclear and Particle Physics
Issue number6
Publication statusPublished - Apr 19 2017


  • color reconnection
  • hydrodynamics
  • particle production
  • particle ratios
  • proton-proton ollision
  • radial flow

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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