PoS - Proceedings of Science
Volume 397 - The Ninth Annual Conference on Large Hadron Collider Physics (LHCP2021) - Poster Session
Strange-hadron correlation studies to investigate strangeness enhancement in pp collisions
C. De Martin*  on behalf of the ALICE collaboration
Full text: pdf
Pre-published on: October 20, 2021
Published on: November 17, 2021
The production of strange and multi-strange hadrons in heavy-ion collisions is enhanced with respect to minimum bias proton-proton (pp) collisions. This feature has been further investigated by studying pp collisions as a function of the produced charged-particle multiplicity. In pp collisions, the strange hadron yields normalised to the pion yield show an increase with the multiplicity of produced particles. The origin of this striking phenomenon remains an open question: is it related to soft particle production or to hard scattering events, such as jets?
The ALICE experiment has further studied this feature by separating strange hadrons produced in jets from those produced in soft processes. For this purpose, the angular correlation between high transverse momentum (${p_{\mathrm{T}}}$) charged particles and strange hadrons has been exploited.
In this poster, the recent measurement of the near-side jet yield and the out-of-jet yield of $\mathrm{K^0_S}$ and $\Xi$ is shown as a function of the multiplicity of charged particles produced in pp collisions at $\sqrt{s}=13$ TeV. The ratio between the $\Xi$ and the $\mathrm{K^0_S}$ yields is also shown, to highlight the effect of the different strangeness content of the two hadrons.

The results suggest that soft (out of jet) processes are the dominant contribution to strange particle production.
DOI: https://doi.org/10.22323/1.397.0249
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