Effect of color reconnection and rope formation on resonance production in p$-$p collisions in Pythia 8

Abstract

The resonance production in proton−proton collisions at √ s = 7 TeV and 13 TeV have been investigated using Pythia 8 event generator within the framework of microscopic processes like color reconnection and rope hadronization. Specifically, the observable effects of different modes of color reconnections on the ratio of yields of mesonic and baryonic resonances with respect to their stable counterpart have been explored as a function of event activity. A suppression in the ratio is observed as a function of number of multi-partonic interactions for mesonic resonances. The φ/K and φ/π ratios show an enhancement for high multiplicity events due to enhanced production of strange quarks via the microscopic process of rope hadronization in the partonic phase. The mechanism of the hadronization of color ropes together with the QCD-based color reconnection of partons predicted an enhancement in the ratio for baryonic resonances to non-resonance baryons having similar quark content. The yield ratios of resonances are found to be independent of the collision energy and strongly dependent on event activity.

Understanding long-range near-side ridge correlations in p$-$p collisions using rope hadronization at LHC energies

“…In this work, the two particle correlation of charged particles in ∆η − ∆φ is investigated in details using the shoving mechanism implemented in Pythia 8 [15] event generator for p−p collisions at √ s = 7 TeV and 13 TeV. The theory of color reconnections and string hadronization via the formation of ropes could explain the strangeness enhancement and the suppression of yields of resonance particles in p−p collisions at √ s = 7 TeV and 13 TeV using Pythia 8 [18][19][20][21]. The model does not assume the formation of a deconfined and thermalized plasma state due to the dynamical interactions between the partons.…”