Improved limit on the directly measured antiproton lifetime. (31st August 2017)

• Record Type: Journal Article
• Authors: Sellner, S; Besirli, M; Bohman, M; Borchert, M J; Harrington, J; Higuchi, T; Mooser, A; Nagahama, H; Schneider, G; Smorra, C; Tanaka, T; Blaum, K; Matsuda, Y; Ospelkaus, C; Quint, W; Walz, J; Yamazaki, Y; Ulmer, S
• Is Part Of: New journal of physics. Volume 19:Number 8(2017:Aug.)
• Publication Date: 2017-08-31
• Subjects: CPT invariance -- antiprotons -- lifetimes -- penning traps; 21.10.Tg -- 14.20.-c -- 13.30.-a -- 11.30.Er -- 37.10.Ty; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/aa7e73
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: Continuous monitoring of a cloud of antiprotons stored in a Penning trap for 405 days enables us to set an improved limit on the directly measured antiproton lifetime. From our measurements we extract a storage time of 3.15 × 10 8 equivalent antiproton-seconds, resulting in a lower lifetime limit of τ p ̄ > 10.2 a with a confidence level of 68 % . This result improves the limit on charge-parity-time violation in antiproton decays based on direct observation by a factor of 7.