Studying strangeness and baryon production mechanisms through angular correlations between charged $\Xi$ baryons and identified hadrons in pp collisions at $\sqrt{s}$ = 13 TeV

Abstract

The angular correlations between charged $\Xi$ baryons and associated identified hadrons (pions, kaons, protons, $\Lambda$ baryons, and $\Xi$ baryons) are measured in pp collisions at $\sqrt{s}=13$ TeV with the ALICE detector to give insight into the particle production mechanisms and balancing of quantum numbers on the microscopic level. In particular, the distribution of strangeness is investigated in the correlations between the doubly-strange $\Xi$ baryon and mesons and baryons that contain a single strange quark, K and $\Lambda$. As a reference, the results are compared to $\Xi \pi$ and $\Xi \mathrm{p}$ correlations, where the associated mesons and baryons do not contain a strange valence quark. These measurements are expected to be sensitive to whether strangeness is produced through string breaking or in a thermal production scenario. Furthermore, the multiplicity dependence of the correlation functions is measured to look for the turn-on of additional particle production mechanisms with event activity. The results are compared to predictions from the string-breaking model PYTHIA 8, including tunes with baryon junctions and rope hadronisation enabled, the cluster hadronisation model HERWIG 7, and the core-corona model EPOS-LHC. While some aspects of the experimental data are described quantitatively or qualitatively by the Monte Carlo models, no model can match all features of the data. These results provide stringent constraints on the strangeness and baryon number production mechanisms in pp collisions.

37 pages, 14 captioned figures, 3 tables, authors from page 31, published version, figures at http://alice-publications.web.cern.ch/node/9678

References in corpus (15)

• Herwig++ Physics and Manual
• EPOS LHC : test of collective hadronization with LHC data
• Herwig 7.0 / Herwig++ 3.0 Release Note
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• Performance of the ALICE Experiment at the CERN LHC
• String Formation Beyond Leading Colour
• Color reconnection and flow-like patterns in pp collisions
• Core-Corona Separation in Ultra-Relativistic Heavy Ion Collisions
• Clocking hadronization in relativistic heavy ion collisions with balance functions
• Transverse radial expansion in nuclear collisions and two particle correlations
• Effects of Colour Reconnection on Hadron Flavour Observables
• Centrality Dependence of Strangeness Enhancement in Ultrarelativistic Heavy Ion Collisions - a Core-Corona Effect
• Strangeness enhancement and Energy dependence in Heavy Ion Collisions
• General Charge Balance Functions, A Tool for Studying the Chemical Evolution of the Quark-Gluon Plasma
• QCD Challenges from pp to A-A Collisions

Cited by in corpus (1)

• Measurement of event shapes in minimum-bias events from proton-proton collisions at $\sqrt{s}$ = 13 TeV