The p−p collisions at high multiplicity at LHC show small scale collective effects similar to that observed in heavy ion collisions such as enhanced production of strange and multi-strange hadrons, long range azimuthal correlations, etc. The observation of strangeness enhancement in p−p collisions at at √ s = 7 TeV and 13 TeV as measured by ALICE experiment is explored using Pythia8 event generator within the framework of microscopic rope hadronization model which assumes the formation of ropes due to overlapping of strings in high multiplicity environment. The transverse momentum (pT ) spectra shape and its hardening with multiplicity is well described by the model. The mechanism of formation of ropes also described the observed experimental strangeness enhancement for higher multiplicity classes in p−p collisions at 7 TeV and 13 TeV. The enhancement with multiplicity is further investigated by studying the mean pT (< pT >) and the integrated yields (< dN/dy > ) of strange and multi-strange hadrons and comparing the predictions to the measured data at LHC for 7 TeV and 13 TeV. * ranjit@phy.iitb.ac.in † sp15ms159@iiserkol.ac.in ‡ sadhana@phy.iitb.ac.in

The transverse momentum (pT ) distribution of strange hadrons (K 0 S and Λ) and multi-strange hadrons( Ξ and Ω) measured in p−p, p−Pb, and Pb−Pb collisions at LHC energies have been studied for different multiplicity classes using Tsallis-Weibull (or q−Weibull) formalism. The distribution describes the measured pT spectra for all multiplicity (or centrality) classes. The multiplicity dependence of the extracted parameters are studied for the mentioned collisions systems. The λ parameter was observed to increase systematically with the collision multiplicity and follows a mass hierarchy for all collision system. This characteristic feature indicates that λ can be associated to the strength of collectivity for heavy ion collisions. It can also be related to strength of dynamic effects such as multi-partonic interactions and color reconnections which mimic collectivity in smaller systems. The non-extensive q parameter is found to be greater than one for all the particles suggesting that the strange particles are emitted from a source which is not fully equilibrated.