Электронный каталог

Статья

Acharya, S.
Measurement of the *L Hyperon Lifetime / S.Acharya, B.Batyunya, C.Ceballos Sanchez, R.A.Diaz, S.Grigoryan, A.Kondratyev, L.Malinina, K.Mikhaylov, P.Nomokonov, V.Pozdniakov, E.Rogochaya, G.Romanenko, B.Rumyantsev, A.Vodopyanov, [ALICE Collab.] // Physical Review D [Electronic resource]. – 2023. – Vol.108, No.3. – P.032009. – URL: https://doi.org/10.1103/PhysRevD.108.032009. – Bibliogr.:30.

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−τ¯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¯Λ are in agreement with the corresponding world averages of the Particle Data Group and about a factor of three more precise.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 346.6г - Гиперонные резонансы
Спец.(статьи,препринты) = С 343 е2 - Взаимодействие релятивистских ядер с ядрами