Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

New insights into strangeness production in pp collisions with ALICE at the LHC

Jul 7, 2022, 9:50 AM
Room 3 (Verde)

Room 3 (Verde)

Parallel Talk Heavy Ions Heavy Ions


Francesca Ercolessi (Istituto Nazionale di Fisica Nucleare)


One of the key challenges of hadron physics today is understanding the origin of strangeness enhancement in high-energy hadronic collisions, i.e. the increase of (multi)strange hadron yields relative to non-strange hadron yields with increasing charged-particle multiplicity. In particular, what remains unclear is the relative contribution to this phenomenon from hard and soft QCD processes and the role of initial-state effects such as effective energy. The latter is the difference between the total centre-of-mass energy and the energy of leading baryons emitted at forward/backward rapidities. The superior tracking and particle-identification capabilities of ALICE make this detector unique in measuring (multi)strange hadrons via the reconstruction of their weak decays over a wide momentum range. The effective energy is measured using zero-degree hadronic calorimeters (ZDC).

In this talk, recent results on K$^0_S$ and $\Xi$ production in- and out-of-jets in pp collisions at $\sqrt{s}$=13 TeV using the two-particle correlation method are presented. To address the role of initial and final state effects, a double differential measurement of (multi)strange hadron production as a function of multiplicity and effective energy is also presented. The results of these measurements are compared to expectations from state-of-the-art phenomenological models implemented in commonly used Monte Carlo event generators.

In-person participation Yes

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