Insight into $\rm{K}^*(892)^{0}$ production in pp collisions as a function of collision energy, event-topology, and multiplicity with ALICE at the LHC

Abstract

Hadronic resonances are short-lived particles whose lifetimes are comparable to the hadronic phase lifetime of the system produced in ultra-relativistic nucleon$-$nucleon or nuclear collisions. These resonances are sensitive to the hadronic phase effects such as re-scattering and regeneration processes which might affect the resonance yields and shape of the transverse momentum spectra. In addition, event shape observables like transverse spherocity are sensitive to the hard and soft processes and they represent a useful tool to separate the isotropic from jetty-dominated events in proton$-$proton (pp) collisions. A double differential study of transverse spherocity and multiplicity allows us to understand the resonance production mechanism with event topology and system size, respectively. Furthermore, the measurements in small systems are used as a reference for heavy-ion collisions and are helpful for the tuning of Quantum Chromodynamics (QCD) inspired event generators. In this proceeding, we present recent results on $\rm{K}^*(892)^{0}$ obtained by the ALICE Collaboration in pp collisions at several collision energies, event multiplicities, and as a function of transverse spherocity. The results include the transverse momentum spectra, yields, and their ratio to long-lived particles. The measurements are compared with model predictions from PYTHIA8, EPOS-LHC, and DIPSY.