Univ Sao Paulo, Inst Fis, BR-05508 Sao Paulo, Brazil
; Fermi Natl Accelerator Lab, Batavia, IL 60510 USA
; Petersburg Nucl Phys Inst, Gatchina, Russia
; Inst High Energy Phys, Beijing 100039, Peoples R China
; Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England
; Carnegie Mellon Univ, Pittsburgh, PA 15213 USA
; Univ Iowa, Iowa City, IA 52242 USA
; Inst Theoret & Expt Phys, Moscow 117259, Russia
; SUNY Albany, Albany, NY 12222 USA
; Univ Fed Paraiba, BR-58059900 Joao Pessoa, Paraiba, Brazil
; Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil
; CNPq, Rio De Janeiro, Brazil
; Yale Univ, JW Gibbs Lab, New Haven, CT 06511 USA
We have measured the lifetime of the <(Sigma)over bar>(-) using the Fermilab, Proton Center 375 GeV/c charged hyperon beam. We obtained (80.43+/-0.80+/-0.14) ps. We also measured the lifetime of the Sigma(+), obtaining (80.38 +/-0.40+/-0.14) ps, in agreement with the Particle Data Group value. A direct comparison between the two lifetimes from the ratio of the decay curves gives a fractional lifetime difference of Delta tau/<(tau)over bar>=(-0.06+/-1.12)%, consistent with equal lifetimes for baryon and antibaryon as required by CPT invariance.
Barbosa, RF,Albuquerque, IF,Bondar, NF,et al. Measurement of the (Sigma)over-bar(-) lifetime and direct comparison with the Sigma(+) lifetime[J]. PHYSICAL REVIEW D,2000,61(3):31101.
Barbosa, RF.,Albuquerque, IF.,Bondar, NF.,Carrigan, R.,Chen, D.,...&Zhong, YY.(2000).Measurement of the (Sigma)over-bar(-) lifetime and direct comparison with the Sigma(+) lifetime.PHYSICAL REVIEW D,61(3),31101.
Barbosa, RF,et al."Measurement of the (Sigma)over-bar(-) lifetime and direct comparison with the Sigma(+) lifetime".PHYSICAL REVIEW D 61.3(2000):31101.