Event-shape- and multiplicity-dependent identified particleproduction in pp collisions at 13 TeV with ALICE at the LHC

Bencédi, Gyula (2019) Event-shape- and multiplicity-dependent identified particleproduction in pp collisions at 13 TeV with ALICE at the LHC. Nuclear Physics A, 982. pp. 507-510. ISSN 0375-9474

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Abstract

Multiplicity-dependent measurements of identified particle production led to the discovery of collective-like behaviorin pp collisions at the LHC. Better understanding of the effects attributed to well-understood physics, like multiple hardscatterings, is required to establish whether this behaviour is truly collective in origin. Experimentally, those effects canbe controlled using event shapes, like transverse spherocity, which allows the classification of pp collisions either asjetty or isotropic events. The transverse momentum (pT) spectra of light-flavor hadrons in pp collisions measured over abroad range provide important input to study particle production mechanisms in the soft and hard scattering regimes ofthe QCD. In this work, they are used to perform a comprehensive study as a function of the event multiplicity, collisionenergy, and event shapes. The proton-to-pion and kaon-to-pion particle ratios as a function ofpTare also reported andthe results compared to QCD-inspired models.

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