Measurement of the low-energy antitriton inelastic cross section

TL;DR

This paper reports the first measurement of the inelastic cross section for antitriton-nucleus interactions in a specific momentum range using ALICE detector data, advancing understanding of antinuclei interactions.

Contribution

It introduces a novel measurement of the antitriton inelastic cross section and demonstrates the feasibility of studying isospin dependence of inelastic interactions.

Findings

First measurement of antitriton inelastic cross section

Validation of simulation methods with experimental data

Potential to study isospin dependence of antinuclei interactions

Abstract

In this Letter, the first measurement of the inelastic cross section for antitriton$-$nucleus interactions is reported, covering the momentum range of $0.8 \leq p < 2.4$ GeV/$c$. The measurement is carried out using data recorded with the ALICE detector in pp and Pb$-$Pb collisions at a centre-of-mass energy per nucleon of 13 TeV and 5.02 TeV, respectively. The detector material serves as an absorber for antitriton nuclei. The raw yield of (anti)triton nuclei measured with the ALICE apparatus is compared to the results from detailed ALICE simulations based on the GEANT4 toolkit for the propagation of (anti)particles through matter, allowing one to quantify the inelastic interaction probability in the detector material. This analysis complements the measurement of the inelastic cross section of antinuclei up to $A=3$ carried out by the ALICE Collaboration, and demonstrates the feasibility of the study of the isospin dependence of inelastic interaction cross section with the analysis techniques presented in this Letter.