May 17 – 22, 2021
US/Eastern timezone

Event-shape studies of strangeness production in $\sqrt{s}$ = 13 TeV pp collisions with ALICE

May 19, 2021, 9:30 AM
Room C (Zoom)

Room C


zoom co-host: Zhongling Ji
Experimental talk Strangeness production in nuclear collisions and hadronic interactions Open and New (Charge and Flavor)


Adrian Fereydon Nassirpour (Lund University (SE))


Significant strangeness enhancement and radial flow have been observed in high-multiplicity pp collisions at LHC. The origin of these effects is still under debate. In this contribution, new and more differential measurements are presented, making use of event-shape techniques to study final-state topologies: (i) the transverse spherocity, which aims to classify events into jetty (back-to-back) and isotropic to isolate hard and soft effects, respectively; (ii) the self-normalized Underlying Event (UE) activity, RT, which allows the UE to be significantly suppressed or enhanced. Using observables that control the hard-to-soft ratio and the UE, one gains novel insights into the mechanism responsible for the QGP-like effects in small systems. The results will be presented for a large variety of strange and non-strange hadrons and resonances (π, K, K$^{∗0}$, p, φ, and Ξ) and will be compared to calculations using both PYTHIA 8 and EPOS LHC event generators.

Collaboration ALICE

Primary author

Adrian Fereydon Nassirpour (Lund University (SE))

Presentation materials