The striking similarities that have been observed between
high-multiplicity proton-proton (pp) collisions and heavy-ion collisions
can be explored through multiplicity-differential measurements of
identified hadrons in pp collisions. With these measurements, it is
possible to study mechanisms such as collective flow that determine the
shapes of hadron transverse momentum (p(T)) spectra, to search for
possible modifications of the yields of short-lived hadronic resonances
due to scattering effects in an extended hadron-gas phase, and to
investigate different explanations provided by phenomenological models
for enhancement of strangeness production with increasing multiplicity.
In this paper, these topics are addressed through measurements of the
K* (892)(0) and phi(1020) mesons at midrapidity in pp collisions at
root s = 13 TeV as a function of the charged-particle multiplicity. The
results include the p(T) spectra, p(T)-integrated yields, mean
transverse momenta, and the ratios of the yields of these resonances to
those of longer-lived hadrons. Comparisons with results from other
collision systems and energies, as well as predictions from
phenomenological models, are also discussed. (C) 2020 European
Organization for Nuclear Research. Published by Elsevier B.V