Measurement of the Λ hyperon lifetime

0579050 - ÚJF 2024 RIV US eng J - Článek v odborném periodiku
Acharya, S. - Adamová, Dagmar - Adler, A. - Aglieri Rinella, G. - Bielčík, J. - Bielčíková, Jana - Broz, M. - Contreras, J. G. - Filová, V. - Grecká, Ekaterina - Grund, D. - Herman, T. - Isakov, Artem - Kotliarov, Artem - Krupová, D. M. - Křížek, Filip - Kushpil, Svetlana - Petráček, V. - Šafařík, K. - Torres, S. R. - Závada, Petr … celkem 1039 autorů
Measurement of the Λ hyperon lifetime.
Physical Review D. Roč. 108, č. 3 (2023), č. článku 032009. ISSN 2470-0010. E-ISSN 2470-0029
Výzkumná infrastruktura: CERN-CZ III - 90240
Institucionální podpora: RVO:68378271 ; RVO:61389005
Klíčová slova: ALICE collaboration * heavy ion experiment
Obor OECD: Nuclear physics; Particles and field physics (FZU-D)
Impakt faktor: 5, rok: 2022
Způsob publikování: Open access
https://doi.org/10.1103/PhysRevD.108.032009

A new, more precise measurement of the. hyperon lifetime is performed using a large data sample of Pb-Pb collisions at root s(NN) = 5.02 TeV with ALICE. The Lambda and (Lambda) over bar hyperons are reconstructed at midrapidity using their two-body weak decay channel Lambda -> p + pi(-) and (Lambda) over bar -> (p ) over bar + pi(+). The measured value of the. lifetime is tau(Lambda) = [261.07 +/- 0.37(stat.) +/- 0.72o(syst)]ps. The relative difference between the lifetime of Lambda and (Lambda) over bar, which represents an important test of CPT invariance in the strangeness sector, is also measured. The obtained value (tau(Lambda) - tau((Lambda) over bar))/tau(Lambda) = (0.0013 +/- 0.0028(stat.) +/- 0.0021(syst.) is consistent with zero within the uncertainties. Both measurements of the. hyperon lifetime and of the relative difference between tau(Lambda) and tau((Lambda) over bar) are in agreement with the corresponding world averages of the Particle Data Group and about a factor of three more precise.
Trvalý link: https://hdl.handle.net/11104/0347926