E-resources
Peer reviewed
Open access
-
Aglieri Rinella, G.; Al-Turany, M.; Aleksandrov, D.; Alici, A.; Alt, T.; Anguelov, V.; Banerjee, D.; Barioglio, L.; Bielčík, J.; Bregant, M.; Camerini, P.; Carballo, A. A.; Chakraborty, P.; Chapeland, S.; Chattopadhyay, S.; Ciupek, M. R.; Contreras, J. G.; Cosentino, M. R.; Das, P.; de Cuveland, J.; Debski, R. J.; Del Grande, R.; Dhankher, P.; Ding, Y.; Dobrin, A.; Durkac, M.; Dzalaiova, N.; Elia, D.; Fernández Téllez, A.; Filova, V.; Fionda, F. M.; Fokin, S.; Furs, A.; Gargiulo, C.; Giacalone, M.; Giubilato, P.; Glässel, P.; Guardiano, G. G.; Gundem, T.; Guzman, S. P.; Hannigan, R.; Harris, J. W.; Innocenti, G. M.; Jaelani, S.; Jahnke, C.; Kaewjai, J.; Kim, T.; Kreis, L.; Kundu, S.; Kurashvili, P.; Kushpil, S.; Kweon, M. J.; Lavicka, R.; Lesch, M. M.; Li, X. L.; Lopez, J. A.; Malaev, M.; Mandal, S. K.; Mayer, C.; Mechler, A. F.; Modak, A.; Morsch, A.; Munzer, R. H.; Nattrass, C.; Nesterov, D.; Nyanin, A.; Pagano, D.; Paul, B.; Pezzi, R. P.; Pshenichnov, I.; Ramello, L.; Rauch, M. P.; Ravasenga, I.; Rogalev, R.; Rohr, D.; Roy, S.; Russo, R.; Rustamov, A.; Saarimaki, O. A. M.; Sahu, D.; Salvan, M. P.; Sarkar, N.; Singh, R.; Sinha, T.; Skaali, T. B.; Soramel, F.; Steffanic, P. J.; Storehaug, I.; Stylianidis, C. P.; Taillepied, G.; Tapia Takaki, J. D.; Tauro, A.; Torres Ramos, A. G.; Urioni, M.; Vala, M.; Vrláková, J.; Wang, C.; Yoon, J. H.; Zhang, L.; Zhang, Z.
Physical review. D, 08/2023, Volume: 108, Issue: 3Journal Article
A new, more precise measurement of the Λ hyperon lifetime is performed using a large data sample of Pb-Pb collisions at $\sqrt{s_{NN}}$=5.02 TeV with ALICE. The Λ and $\bar{Λ}$ hyperons are reconstructed at midrapidity using their two-body weak decay channel Λ→p+π- and $\bar{Λ}$→$\bar{p}$+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 $\bar{Λ}$, which represents an important test of CPT invariance in the strangeness sector, is also measured. The obtained value (τΛ-τ$\bar{Λ}$)/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$\bar{Λ}$ are in agreement with the corresponding world averages of the Particle Data Group and about a factor of three more precise.
