Color reconnection effects on resonance production

Abstract

We present studies that show how multi-parton interaction and color reconnection affect the hadro-chemistry in proton-proton (pp) collisions with special focus on the production of resonances using the PYTHIA8 event generator. We find that color reconnection suppresses the relative production of meson resonances such as ${\rho }_0$ and K*, providing an alternative explanation for the K*/K decrease observed in proton-proton collisions as a function of multiplicity by the ALICE collaboration. Detailed studies of the underlying mechanism causing meson resonance suppression indicate that color reconnection leads to shorter, less energetic strings whose fragmentation is less likely to produce more massive hadrons for a given quark content, therefore reducing ratios such as K*/K and ${\rho }_0/\pi$ in high-multiplicity pp collisions. In addition, we have also studied the effects of allowing string junctions to form and found that these may also contribute to resonance suppression.

15 pages, 8 captioned figures

References in corpus (5)

• PYTHIA 6.4 Physics and Manual
• An Introduction to PYTHIA 8.2
• Herwig++ Physics and Manual
• K*(892)${}^0$ and $\Phi$(1020) production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Azimuthal asymmetries and the emergence of "collectivity" from multi-particle correlations in high-energy pA collisions

Cited by in corpus (5)

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• ${\eta }^{\prime }$ Production in Nucleus-Nucleus collisions as a probe of chiral dynamics
• Toward universal coalescence models for antideuteron production
• Rescattering effects on resonances production in small systems with ALICE at the LHC