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Topological studies of light-flavor hadron production in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC

by: Sushanta Tripathy


Recent results for high multiplicity pp and p-Pb collision systems have revealed that they exhibit collective-like behaviors. These were formerly thought to be achievable only in heavy-ion collisions. To understand the origins of these unexpected phenomena, event shape observables such as transverse spherocity ($S_{\rm{0}}$) and the relative transverse activity classifier ($R_{\rm{T}}$) can be exploited as a powerful tool to disentangle soft and hard particle production. 

Results on the production of light flavor hadrons ($\pi$, K p, K^{*0}, $\varphi$ and $\Xi$) as a function of $S_{\rm{0}}$ and $R_{\rm{T}}$ in high multiplicity pp collisions at $\sqrt{s}$ = 13 $\textrm{TeV}$ measured with the ALICE detector at the LHC are presented. The evolution of particle ratios and average transverse momentum ($\langle p_{\rm T}\rangle$) with multiplicity, $S_{\rm{0}}$ and $R_{\rm{T}}$ is also discussed in the context of radial flow and flow-like effects. In addition, the system size dependence of charged particle production in pp, p-Pb and Pb-Pb collisions at $\sqrt{s}$ = 5.02 TeV will be presented. The evolution of the transverse momentum spectra, integrated yields and $\langle p_{\rm T}\rangle$ in different topological regions as a function of $R_{\rm{T}}$ are presented. These are compared with event generators such as EPOS-LHC and PYTHIA8 (ANGANTYR). Finally, within the same approach, we present a search for jet quenching behavior in small collision systems.