Speaker
Description
Angular (ΔηΔφ) correlations of identified particles in ultrarelativistic proton-proton and heavy-ion collisions exhibit features dependent on collision systems and particle types. These characteristics stem from mechanisms such as (mini-)jets, elliptic flow, resonance decays, and conservation laws, with quantum statistics and final-state interactions influencing each particle pair’s unique correlation function.
ALICE [1] and STAR [2] measurements of ΔηΔφ correlations show distinctions in baryon versus meson production. While meson correlation functions display an expected near-side peak attributed to mini-jet fragmentation, which is well reproduced by general-purpose Monte Carlo (MC) models, baryon-baryon correlations reveal a surprising near-side anti-correlation structure. This effect has not been reproduced by the MC models until recently [3, 4, 5, 6], posing fundamental questions about the production mechanism of baryons.
This talk presents new insights into this “baryon correlation puzzle”. Using Run 2 data from ALICE, a comprehensive study of multiplicity centrality dependent angular correlation functions for pairs of pions, kaons, and protons in pp, p–Pb, and Pb–Pb collisions, along with new Run 3 results for pp collisions at 13.6 TeV, are provided. These include correlation functions for baryon pairs and a new analysis of strange and charm sectors, featuring multi-strange baryons (pΞ, pΩ), pϕ, and pD correlations, allowing for tests of mass dependence and baryon number conservation.
References
[1] J. Adam et al. (ALICE Collaboration), Eur. Phys. J. C77 (2017) 56
[2] J. Adam et al. (STAR Collaboration), Phys. Rev. C 101, 014916 (2020)
[3] L.Y. Zhang et al., Phys. Rev. C 98 (2018) 3, 034912
[4] L.Y. Zhang et al., Phys. Lett. B 829 (2022) 137063
[5] N. Demazure, V. Gonzalez, F. Llanes-Estrada, Few Body Systems 64, 57 (2023)
[6] L. Graczykowski, M. Janik, Phys. Rev. C 104, 054909 (2021)
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | ALICE |
