Speaker
Description
The ratio of strange to non-strange hadron yields increases from low-multiplicity to high-multiplicity hadronic interactions, reaching values observed in heavy-ion collisions. The ALICE experiment investigates the microscopic origin of this striking phenomenon by performing dedicated multi-differential analyses in pp collisions at $\sqrt{s}$ = 13 TeV.
To separate strange hadrons produced in jets from those produced in soft processes, the angular correlation between high-$p_{\rm T}$ charged particles and strange hadrons is exploited. The near-side jet and out-of-jet yield of $K^{0}_{S}$ and $\Xi^{\pm}$ are studied as a function of the charged particle multiplicity, up to values comparable to those reached in peripheral Pb-Pb collisions.
In order to disentangle initial and final state effects, a new analysis exploits the concept of the effective energy available for particle production, which is anticorrelated with the forward energy deposited in the Zero Degree Calorimeters (ZDC). (Multi-)strange hadron production is studied as a function of the charged particle multiplicity measured at midrapidity and of the forward energy detected by the ZDC.
The results suggest that soft (i.e., out-of-jet) processes are the dominant contribution to strange particle production and provide new insights on the role of initial state effects on strangeness enhancement in pp collisions.
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