Measurement of the (Sigma)over-bar(-) lifetime and direct comparison with the Sigma(+) lifetime - art. no. 031101

Citation
Rf. Barbosa et al., Measurement of the (Sigma)over-bar(-) lifetime and direct comparison with the Sigma(+) lifetime - art. no. 031101, PHYS REV D, 6103(3), 2000, pp. 1101
Citations number
7
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
0556-2821 → ACNP
Volume
6103
Issue
3
Year of publication
2000
Database
ISI
SICI code
0556-2821(20000201)6103:3<1101:MOT(LA>2.0.ZU;2-G
Abstract
We have measured the lifetime of the <(Sigma)over bar>(-) using the Fermila b, 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 dir ect 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 req uired by CPT invariance.