Multi-parton interactions in pp collisions using charged-particle flattenicity with ALICE

Abstract

Event classifiers based either on the charged-particle multiplicity or on event topologies, such as spherocity and underlying event, became very useful tools to study collective-like behaviors in small collision systems. However, multiplicity-based event classifiers were shown to bias the data sample in a way that can obscure the effects of multi-parton interactions, and, this way, make it difficult to pin down the origins of small-system collectivity.In this proceedings, the measurement of the transverse momentum (𝑝 T ) spectra of primary charged pions, kaons, (anti)protons and unidentified hadrons in inelastic pp collisions at √ 𝑠 = 13 TeV are reported. Events are classified using a novel event shape observable, flattenicity, that was proposed to select minijet-enhanced pp collisions. Particle production is studied as a function of flattenicity and double-differentially as a function of flattenicity and charged-particle multiplicity. The results are compared with theoretical predictions from the PYTHIA 8 and EPOS LHC Monte Carlo models.