26-30 July 2021
Europe/Berlin timezone

Understanding baryon and strangeness production using two-particle angular correlations in pp collisions from ALICE

Not scheduled


Poster QCD and Hadronic Physics T06: QCD and Hadronic Physics


Malgorzata Janik Malgorzata Janik (Warsaw University of Technology, WUT)


Correlations between identified particles produced in high-energy nuclear collisions provide a wealth of information about hadronization mechanisms and the evolution of the system. New correlation measurements between long-lived particles (including $\pi$, K, p, $\Lambda$,$\Xi$) are used to investigate the particle production and the species dependence of (mini)jet fragmentation. The string/rope model predicts that strangeness is produced in $\rm{s\bar{s}}$ pair breaking, therefore, correlations between strange and anti-strange hadrons are expected, and studies of these correlations can provide information on strangeness production mechanisms. In this talk we present measurements of $\Xi-$$\pi$, $\Xi-$K, $\Xi-$p, $\Xi-$$\Lambda$, and $\Xi-$$\Xi$ angular correlations in pp collisions at $\sqrt{s}=$ 13 TeV as a function of multiplicity, and discuss the implications for this unique probe on the understanding of strangeness production mechanisms. Furthermore, in previous measurements in pp collisions at $\sqrt{s}=$ 7 TeV we observed that correlations between baryons show qualitatively different behavior than those of mesons, and the origin of this difference is still unknown. We will show new results on $\pi$, K, p, and $\Lambda$ correlations from $\sqrt{s}=$ 13 TeV pp collisions, which present a challenge to the contemporary models of particle production in elementary systems.

Collaboration / Activity ALICE

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