28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

Hadronization studies at the LHC with ALICE

29 Jul 2020, 19:30
15m
virtual conference

virtual conference

Talk 06. Strong Interactions and Hadron Physics Strong Interactions and Hadron Physics

Speaker

Jianhui Zhu (Central China Normal University CCNU (CN))

Description

Studies on the production of light- and heavy-flavour baryons are of prominent importance to investigate hadronization mechanisms at the LHC, in particular through the study of the evolution of the baryon-over-meson production ratio as a function of the transverse momentum. Measurements performed in pp and p-Pb collisions at the LHC have revealed unexpected features, qualitatively similar to what was observed in larger systems and, in the charm sector, not in line with the expectations based on previous measurements from $e^{+}e^{-}$ colliders and in e-p collisions. These results suggest that charmed baryon formation might not be universal and that the baryon-over-meson ratio depends on the collision system. Models that better reproduce the $\Lambda_c$/$D^0$ ratio in pp collisions, some of them based on enhanced color reconnection mechanisms, expect a significant contribution to $\Lambda_c$ yield from decays of heavier charm-baryon states.

The ALICE detector is well suited to detect charm baryons down to low $p_{\rm T}$ thanks to the excellent tracking capabilities and state-of-the-art particle identification. $\Lambda_c$ baryons are reconstructed in the hadronic decay channels $\Lambda_c \rightarrow pK^0_s$ and $\Lambda_c \rightarrow pK\pi$ by means of machine-learning methods. A review of ALICE extensive measurements of protons, hyperons and charmed baryons, including the measurement of $\Lambda_c$ production as a function of charged-particle multiplicity in pp and p-Pb collisions, will be presented. Comparison to phenomenological models will be also discussed. Emphasis will be given to the discussion of the impact of these studies on our understanding of hadronization processes. Finally, the status and prospects for $\Xi_c$ and $\Sigma_c$ measurements, as well as the planned measurements of $\Lambda_b$ during LHC Run 3 data taking will be discussed.

Primary author

Jianhui Zhu (Central China Normal University CCNU (CN))

Presentation materials