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Abstract
We present a microscopic model for collective effects in high multiplicity proton–proton collisions, where multiple partonic subcollisions give rise to a dense system of strings. From lattice calculations we know that QCD strings are transversely extended, and we argue that this should result in a transverse pressure and expansion, similar to the flow in a deconfined plasma. The model is implemented in the Pythia8 Monte Carlo event generator, and we find that it can qualitatively reproduce the long range azimuthal correlations forming a near-side ridge in high multiplicity proton–proton events at LHC energies.
Highlights
We present a microscopic model for collective effects in high multiplicity proton–proton collisions, where multiple partonic subcollisions give rise to a dense system of strings
The general features of proton-proton collisions, such as jets, multiplicity distributions, and particle ratios, can be described by dynamical models based on string [1] or cluster [2] hadronisation, e.g. PYTHIA8 [3, 4] and HERWIG7 [5], in a very satisfactory way
Many features in nucleus collisions, such as multiplicity distributions and particle distributions in rapidity and p⊥, could fairly well be described by early models based on non-interacting strings (e.g. DPM [9] and Fritiof [10])
Summary
We present a microscopic model for collective effects in high multiplicity proton–proton collisions, where multiple partonic subcollisions give rise to a dense system of strings. Introduction — The general features of proton-proton collisions, such as jets, multiplicity distributions, and (approximate) particle ratios, can be described by dynamical models based on string [1] or cluster [2] hadronisation, e.g. PYTHIA8 [3, 4] and HERWIG7 [5], in a very satisfactory way. Many features in nucleus collisions, such as multiplicity distributions and particle distributions in rapidity and p⊥, could fairly well be described by early models based on non-interacting strings (e.g. DPM [9] and Fritiof [10]).
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