Refine
Year of publication
Language
- English (461)
Has Fulltext
- yes (461)
Is part of the Bibliography
- no (461)
Keywords
- Heavy Ion Experiments (9)
- LHC (7)
- Hadron-Hadron Scattering (5)
- Hadron-Hadron scattering (experiments) (5)
- Quark-Gluon Plasma (4)
- ALICE (3)
- ALICE experiment (3)
- Heavy-ion collision (3)
- Jets and Jet Substructure (3)
- pp collisions (3)
Institute
- Physik (461)
- Frankfurt Institute for Advanced Studies (FIAS) (422)
- Informatik (404)
- Informatik und Mathematik (3)
A new, more precise measurement of the Λ hyperon lifetime is performed using a large data sample of Pb–Pb collisions at √sNN p ¼ 5.02 TeV with ALICE. The Λ and Λ¯ hyperons are reconstructed at midrapidity using their two-body weak decay channel Λ → p þ π− and Λ¯ → p¯ þ πþ. The measured value of the Λ lifetime is τΛ ¼ ½261.07 0.37ðstat:Þ 0.72ðsyst:Þ 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 ðτΛ − τΛ¯Þ=τΛ ¼ 0.0013 0.0028ðstat:Þ 0.0021ðsyst:Þ is consistent with zero within the uncertainties. Both measurements of the Λ hyperon lifetime and of the relative difference between τΛ and τΛ¯ are in agreement with the corresponding world averages of the Particle Data Group and about a factor of three more precise.