Abstract
Data collected at the LHC are confronted with the possible existence of flow in pp collisions. Here we present a study inside the framework of PYTHIA 8, showing that it contains implicit flow-like effects coming from multiple hard subcollisions and color string formation between initial and final partons from independent hard scatterings: color reconnection. We present studies with strange hadron observables in pp collisions at 7 TeV. Studies have been done both for minimum bias and multiplicity intervals in events with and without color reconnection to isolate the flow-like effect.
Highlights
With the data collected at the LHC we are confronted with the possible existence of flow in pp collisions
It is important to stress that particles are not used for calculations, and a local thermal equilibrium is assumed as the starting point of the hydrodynamic evolution of the system
We argue that color reconnection (CR) is another mechanism of flow where the boost is introduced at the partonic state just before hadronization in events with several multi-partonic interactions (MPI)
Summary
With the data collected at the LHC we are confronted with the possible existence of flow in pp collisions. With CR, 2 partons from independent hard scatterings at mid-rapidity can color reconnect and make a large transverse boost (Fig. 2c).
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