# Online Strangeness in Quark Matter Conference 2021

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
20m
Room C (Zoom)

### Room C

#### Zoom

zoom co-host: Zhongling Ji https://stonybrook.zoom.us/j/99045792821
Experimental talk Strangeness production in nuclear collisions and hadronic interactions

### Speaker

Adrian Fereydon Nassirpour (Lund University (SE))

### Description

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))