Measurement of the Λ hyperon lifetime
- 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−τΛ¯¯¯¯)/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 τΛ¯¯¯¯ are in agreement with the corresponding world averages of the Particle Data Group and about a factor of three more precise.
URN: | urn:nbn:de:hebis:30:3-799742 |
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URL: | https://arxiv.org/abs/2303.00606v1 |
DOI: | https://doi.org/10.48550/arXiv.2303.00606 |
ArXiv Id: | http://arxiv.org/abs/2303.00606v1 |
Parent Title (English): | arXiv |
Series (Serial Number): | CERN Report (CERN-EP-2023-020) |
Publisher: | arXiv |
Document Type: | Preprint |
Language: | English |
Date of Publication (online): | 2023/03/01 |
Date of first Publication: | 2023/03/01 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Creating Corporation: | ALICE (Körperschaft) |
Release Date: | 2023/12/07 |
Issue: | 2303.00606 Version 1 |
Edition: | Version 1 |
Page Number: | 13 |
HeBIS-PPN: | 51467072X |
Institutes: | Physik / Physik |
Informatik und Mathematik / Informatik | |
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS) | |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Sammlungen: | Universitätspublikationen |
Licence (German): | Creative Commons - Namensnennung 4.0 |