NBI Heavy-ion Seminar: Understanding the many-body systems dynamics using the femtoscopy technique at the LHC

Thursday 18 Aug 2022, 11:15 → 12:45 Europe/Copenhagen

Aud. M (NBI)

You Zhou (Niels Bohr Institute)

Title: Understanding the many-body systems dynamics using the femtoscopy technique with ALICE

Speaker: Dr. Raffaele Del Grande (Technical University of Munich)

Abstract:

On the endeavour to explore the strong interaction among hadrons, the ALICE Collaboration has for the first time extended the experimental measurements beyond those of two particles, studying three-body and hadron--nucleus interactions. These measurements aim to clarify many open problems related to the dynamics of many-body systems, such as the role of genuine three-particle interactions, the formation mechanisms of light nuclei in hadron-hadron collisions and the possible formation of exotic bound states between baryons and mesons.   The results presented in this talk are obtained using high-multiplicity pp collisions at \mbox{$\sqrt{s}$ = 13 TeV} measured by ALICE at the LHC. In the first part of the talk, the measured three-particle correlations for p--p--p, p--p--$\Lambda$, p--p--K$^+$ and p--p--K$^-$ systems will be presented. The genuine three-particle correlations (cumulants) are obtained by subtracting the known two-particle effects from the total measured correlation functions. The cumulant for p--p--$\Lambda$, p--p--K$^+$ and p--p--K$^-$ is compatible with zero within the uncertainties. A non-zero cumulant is instead observed for p--p--p, providing a first hint to the existence of a genuine three-body effect.    Another class of many-body interaction studies is identified in the correlations of hadrons with light nuclei. The deuteron is particularly interesting for the study of the isospin dependence of the three-nucleon force and for the understanding of the formation mechanism of light nuclei. The p--d correlations measured by ALICE will be presented. This study demonstrates that the formation of the deuterons in hadron-hadron collisions follows the same pattern of the other hadrons and that, by studying the correlations among light nuclei, it is possible to investigate the wave function of many-body systems in details at the LHC.

Time: August 18th, 2022 at 11.15 AM.

Location: Aud. M

Zoom: https://ucph-ku.zoom.us/j/65825971188?pwd=MGl6TDhXaGc1QjN3YVBzTFBZeUFZUT09 

Meeting ID: 658 2597 1188

passcode: NBI2022

11:15 → 12:15 Understanding the many-body systems dynamics using the femtoscopy technique at the LHC

Speaker: Dr Raffaele Del Grande (TUM)