Jun 7 – 12, 2021
Europe/Paris timezone

Strange-hadron correlation studies to investigate strangeness enhancement in pp collisions

Jun 10, 2021, 6:45 PM


Experimental poster QCD physics Poster Session


Chiara De Martin (Universita e INFN Trieste (IT))


The production of strange and multi-strange hadrons in heavy-ion collisions is enhanced with respect to minimum bias 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-${p_{\mathrm{T}}}$ 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.

Primary author

Chiara De Martin (Universita e INFN Trieste (IT))

Presentation materials