Multiplicity dependence of K*(892)0 and φ(1020) production in pp collisions at √s = 13 TeV
Abstract
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 (pT) 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 φ(1020) mesons at midrapidity in pp collisions
at √s = 13 TeV as a function of the charged-particle multiplicity. The results include the pT spectra,
pT-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
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