Measurement of the Λ hyperon lifetime

(ALICE Collaboration)

doi:10.1103/PhysRevD.108.032009

Measurement of the Λ hyperon lifetime

(ALICE Collaboration)

Clermont-Auvergne University
Nuclear Physics Institute ASCR
Fachbereich Informatik und Mathematik
Goethe University Frankfurt am Main
European Organization for Nuclear Research
INFN Sezione di Torino
INFN Sezione di Bologna
Variable Energy Cyclotron Centre India
Department of Physics
Aligarh Muslim University
Korea Institute of Science and Technology Information
University of P.J. Šafárik
GSI Helmholtzzentrum fur Schwerionenforschung
Central China Normal University
Instituto de Fisica
Universidad Nacional Autónoma de México
University of Houston
Department of Physics and Technology
University of Bergen
Sezione INFN di Cagliari
Institut fär Kernphysik
Horia Hulubei National Institute of Physics and Nuclear Engineering
Institut fär Kernphysik
University of Münster
University of Heidelberg
INFN
Ernest Orlando Lawrence Berkeley National Laboratory
Université de Nantes
LTHE (UMR 5564 CNRS/IRD/Université de Grenoble)
University of São Paulo
Department of Physics
University of Oslo
Yale University
INFN Sezione di Catania
Sungkyunkwan University
Kangwon National University
University of Science and Technology of China
Indian Institute of Technology Indore
Bât. 104-108

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

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-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.

Original language	English
Article number	032009
Journal	Physical Review D
Volume	108
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.108.032009
Publication status	Published - 1 Aug 2023
Externally published	Yes

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10.1103/PhysRevD.108.032009

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@article{93dda96b17de42ee937725c6440d2ed0,

title = "Measurement of the Λ hyperon lifetime",

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-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.",

author = "\{(ALICE Collaboration)\} and S. Acharya and D. Adamov{\'a} and A. Adler and \{Aglieri Rinella\}, G. and M. Agnello and N. Agrawal and Z. Ahammed and S. Ahmad and Ahn, \{S. U.\} and I. Ahuja and A. Akindinov and M. Al-Turany and D. Aleksandrov and B. Alessandro and Alfanda, \{H. M.\} and \{Alfaro Molina\}, R. and B. Ali and A. Alici and N. Alizadehvandchali and A. Alkin and J. Alme and G. Alocco and T. Alt and I. Altsybeev and Anaam, \{M. N.\} and C. Andrei and A. Andronic and V. Anguelov and F. Antinori and P. Antonioli and N. Apadula and L. Aphecetche and H. Appelsh{\"a}user and C. Arata and S. Arcelli and M. Aresti and R. Arnaldi and Arneiro, \{J. G.M.C.A.\} and Arsene, \{I. C.\} and M. Arslandok and A. Augustinus and R. Averbeck and Azmi, \{M. D.\} and A. Badal{\`a} and J. Bae and Baek, \{Y. W.\} and X. Bai and R. Bailhache and Y. Bailung and A. Shatat",

note = "Publisher Copyright: {\textcopyright} 2023 CERN. ",

year = "2023",

month = aug,

day = "1",

doi = "10.1103/PhysRevD.108.032009",

language = "English",

volume = "108",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "3",

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TY - JOUR

T1 - Measurement of the Λ hyperon lifetime

AU - (ALICE Collaboration)

AU - Acharya, S.

AU - Adamová, D.

AU - Adler, A.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, S.

AU - Ahn, S. U.

AU - Ahuja, I.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfanda, H. M.

AU - Alfaro Molina, R.

AU - Ali, B.

AU - Alici, A.

AU - Alizadehvandchali, N.

AU - Alkin, A.

AU - Alme, J.

AU - Alocco, G.

AU - Alt, T.

AU - Altsybeev, I.

AU - Anaam, M. N.

AU - Andrei, C.

AU - Andronic, A.

AU - Anguelov, V.

AU - Antinori, F.

AU - Antonioli, P.

AU - Apadula, N.

AU - Aphecetche, L.

AU - Appelshäuser, H.

AU - Arata, C.

AU - Arcelli, S.

AU - Aresti, M.

AU - Arnaldi, R.

AU - Arneiro, J. G.M.C.A.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Azmi, M. D.

AU - Badalà, A.

AU - Bae, J.

AU - Baek, Y. W.

AU - Bai, X.

AU - Bailhache, R.

AU - Bailung, Y.

AU - Shatat, A.

PY - 2023/8/1

Y1 - 2023/8/1

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85168848895

U2 - 10.1103/PhysRevD.108.032009

DO - 10.1103/PhysRevD.108.032009

M3 - Article

AN - SCOPUS:85168848895

SN - 2470-0010

VL - 108

JO - Physical Review D

JF - Physical Review D

IS - 3

M1 - 032009

ER -

Measurement of the Λ hyperon lifetime

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