Event-shape studies of strangeness production in √S = 13 TeV proton–proton collisions with ALICE

The ALICE Collaboration has observed that the relative fraction of strange hadrons grows strongly with multiplicity in small collision systems at LHC energies, in particular for multi-strange baryons. The origin of this effect is still under debate, and models need significant final-state interactions to accommodate the new ALICE results, requiring new tools to discriminate experimentally between the various phenomenological ideas. In these proceedings we present a multi-differential study of identified particle spectra with respect to the event multiplicity and two different event shape observables, the unweighted transverse spherocity S_O^pT=1, and the self-normalized, transverse charged particle density, R_T, which allows us to explore particle production associated with hard and soft QCD processes. ALICE has measured π, K, ϕ, and Ξ production at mid-rapidity (|η| < 0.8) as a function of S_O^pT=1 and R_T in pp collisions at √S = 13 TeV. This work reports on how these multi-differential measurements compare with predictions from PYTHIA and EPOSLHC.