Event-shape- and multiplicity-dependent identified particle production in pp collisions at 13 TeV with ALICE at the LHC
Abstract
Multiplicity-dependent measurements of identified particle production
led to the discovery of collective-like behavior in pp collisions at the
LHC. Better understanding of the effects attributed to well-understood
physics, like multiple hard scatterings, is required to establish
whether this behaviour is truly collective in origin. Experimentally,
those effects can be controlled using event shapes, like transverse
spherocity, which allows the classification of pp collisions either as
jetty or isotropic events. The transverse momentum (p(T)) spectra of
light-flavor hadrons in pp collisions measured over a broad range
provide important input to study particle production mechanisms in the
soft and hard scattering regimes of the QCD. In this work, they are used
to perform a comprehensive study as a function of the event
multiplicity, collision energy, and event shapes. The proton-to-pion and
kaon-to-pion particle ratios as a function of p(T) are also reported and
the results compared to QCD-inspired models.
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