Light Flavor Hadron Production as a Function of Multiplicity in pp Collisions at $\sqrt{s} = 7$  TeV Measured with ALICE

Excellent tracking and particle identification (PID) capabilities make ALICEALICE a unique tool for the systematic study of light flavorLight flavor hadron productionHadron Production over a wide transverse momentum ( $p_{\mathrm {T}}$ ) range, spanning three orders of magnitude in the event charged-particle multiplicityCharge particle multiplicity in three collision systems, pp, p–Pb, and Pb–Pb. Here, we report recent measurements of $p_{\mathrm {T}}$ -spectra of non-strange, single strange and multi-strange light flavor hadrons, $\langle p_{\mathrm {T}} \rangle $ , and particle ratios at midrapidity as a function of multiplicity in pp collisions at $\sqrt{s}$ = 7 TeV. The measurements in high-multiplicity proton-proton (pp) and proton-lead (p–Pb) collisions show features which resemble those of collective effects observed in heavy-ion Pb–Pb collisions. For instance, in the $p_{\mathrm {T}}$ -differential baryon-to-meson ratios (p/ $\pi $ , $\mathrm {\Lambda }$ /K$^{0S}$ ), an enhancement of baryon production at intermediate $p_{\mathrm {T}}$ is observed with increasing multiplicity in pp collisions, which are qualitatively similar to earlier measurements in p–Pb and Pb–Pb collisions. Moreover, in the smaller colliding systems like pp and p–Pb, the production rate of strange and multi-strange hadrons relative to pions exhibits a significant increase with multiplicity indicating a similar particle production mechanism. QCD-inspired model calculations are unable to simultaneously describe the observed trends for different particle ratios.