ITA
ENG

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

Authors

Barbosa, RF Albuquerque, IF Bondar, NF Carrigan, R Chen, D Cooper, PS Dai, LS Denisov, AS Dobrovolsky, AC Dubbs, T Endler, AMF Escobar, CO Foucher, M Golovtsov, VL Gottschalk, H Gouffon, P Grachev, VT Khanzadeev, AV Kubantsev, MA Kuropatkin, NP Lach, J Langland, J Lang, PF Li, CZ Li, YS Luksys, M Mahon, JRP McCliment, E Morelos, A Newsom, C Maia, MCP Samsonov, VM Schegelsky, VA Shi, HZ Smith, VJ Tang, FU Terentyev, NK Timm, S Tkatch, II Uvarov, LN Vorobyov, AA Jie, Y Zhao, WH Zheng, SC Zhong, YY

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

Categorie Soggetti

Physics

Journal title

PHYSICAL REVIEW D

ISSN journal

05562821 → ACNP

Volume

6103

Issue

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.