Measurement of the Λ hyperon lifetime
ALICE Collaboration. (2023). Measurement of the Λ hyperon lifetime. Physical Review D, 108, Article 032009. https://doi.org/10.1103/PhysRevD.108.032009
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Physical Review DAuthors
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2023Copyright
© 2023 CERN, for the ALICE Collaboration
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.
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American Physical Society (APS)ISSN Search the Publication Forum
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https://converis.jyu.fi/converis/portal/detail/Publication/184710251
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Research Council of Finland; European CommissionFunding program(s)
Centre of Excellence, AoF; RIA Research and Innovation Action, H2020
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
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