First results on $\mathrm{K}^{*}(892)^{\pm}$ resonance production in pp collisions with ALICE at the LHC

Abstract

The study of strange hadronic resonances in pp collisions contributes to the study of strangeness production in small systems. Measurements in pp collisions constitute a reference for the study in larger colliding systems and provide constraints for tuning QCD-inspired event generators. Since the lifetimes of short-lived resonances such as $\mathrm{K}^{*}(892)^{\pm}$ ($\tau \sim 4$ fm/\textit{c}) are comparable with the lifetime of the fireball produced in heavy-ion collisions, regeneration and rescattering effects can modify the measured yield, especially at low transverse momentum. The first results for the $\mathrm{K}^{*}(892)^{\pm}$ resonance obtained in inelastic pp collisions at $\sqrt{\text{s}}=$ 5.02, 8, and 13 TeV will be shown. The $\mathrm{K}^{*}(892)^{\pm}$ has been measured at mid-rapidity via its hadronic decay channel $\mathrm{K}^{*}(892)^{\pm}\rightarrow \mathrm{K}^{0}_{\mathrm{S}}+\pi^{\pm}$, with the ALICE detector. In particular, the transverse momentum ($p_{\mathrm{T}}$) spectrum, integrated yields, $\langle p_{\mathrm{T}}\rangle$ and ratio to stable hadrons will be presented. The $\mathrm{K}^{*}(892)^{\pm}$ results are compared with $\mathrm{K}^{*}(892)^{0}$ measurements and with commonly-used Monte Carlo models. Measurements at 13 TeV are in addition a baseline for comparison with pp measurements at other LHC energies.