A1 Journal article (refereed)
Measurement of the Λ hyperon lifetime (2023)

ALICE Collaboration. (2023). Measurement of the Λ hyperon lifetime. Physical Review D, 108, Article 032009. https://doi.org/10.1103/PhysRevD.108.032009

JYU authors or editors

Publication details

All authors or editors: ALICE Collaboration

Journal or series: Physical Review D

ISSN: 2470-0010

eISSN: 2470-0029

Publication year: 2023

Publication date: 11/08/2023

Volume: 108

Article number: 032009

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevD.108.032009

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/88965

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2303.00606

Abstract

A new, more precise measurement of the Λ hyperon lifetime is performed using a large data sample of Pb–Pb collisions at √sNN =5.02  TeV with ALICE. The Λ and ¯Λ hyperons are reconstructed at midrapidity using their two-body weak decay channel Λ→p+π− and ¯Λ→¯p+π+. The measured value of the Λ lifetime is τΛ=[261.07±0.37(stat.)±0.72(syst.)]  ps. The relative difference between the lifetime of Λ and ¯Λ, which represents an important test of CPT invariance in the strangeness sector, is also measured. The obtained value (τΛ−τ¯Λ)/τΛ=0.0013±0.0028(stat.)±0.0021(syst.) is consistent with zero within the uncertainties. Both measurements of the Λ hyperon lifetime and of the relative difference between τΛ and τ¯Λ are in agreement with the corresponding world averages of the Particle Data Group and about a factor of three more precise.

Keywords: particle physics

Contributing organizations

Related projects

Ministry reporting: Yes

Reporting Year: 2023

JUFO rating: 2