Speaker
Description
ALICE measurements show that strangeness production increases with
multiplicity in small systems (pp and p-Pb collisions) at LHC energies. This
means that one has to give up the idea that a proton-proton collision can be
seen as an incoherent sum of parton-parton collisions; an idea that has been
central in most proton-proton generators, for example PYTHIA. To accommodate
the ALICE results, models have to introduce significant final state effects
and the question is now which ones are correct.
In this talk, I will first cover the general results and give examples of
models/mechanisms with final state interactions. I will then show recent more
differential results using event shapes, underlying event estimators and
correlations and discuss how these measurements can resolve the question of
the underlying physics mechanism.
