Multiplicity dependence of K*(892) And Φ(1020) Production in pp Collisions at TeV

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 ${K}^{⁎}\phantom{\rule{-0.09em}{0ex}}{\left(892\right)}^{0}$ and $\varphi \left(1020\right)$ mesons at midrapidity in pp collisions at $\sqrt{s}=$ 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.