Speaker
Description
Strangeness enhancement has been observed for several multi-strange hadrons in proton-proton (pp) collisions with increasing charged-particle multiplicity and is in remarkable agreement with measurements in p-Pb collisions. The yields of resonances with short lifetimes are sensitive to regeneration and re-scattering processes in the hadronic phase between chemical and kinetic freeze out. It is therefore interesting to study these resonances in pp collisions as a function of multiplicity to see if we can observe signs of a hadron-gas phase even in small collision systems. In this poster, the strange hyperon resonances $\Sigma(1385)^{\pm}$ ($c\tau=5-5.5$ fm/$c$) and $\Xi(1530)^{0}$ ($c\tau=21.8$ fm/$c$) are studied as a function of charged-particle multiplicity in pp collisions at $\sqrt{s}=13$~TeV. The $p_{\mathrm{T}}$ spectra, mean $p_{\mathrm{T}}$ and integrated yields and their ratios to long-lived hadrons will be reported and compared to measurements in other collision systems and to theoretical models.
