New Journal of Physics (Jan 2017)
Improved limit on the directly measured antiproton lifetime
- S Sellner,
- M Besirli,
- M Bohman,
- M J Borchert,
- J Harrington,
- T Higuchi,
- A Mooser,
- H Nagahama,
- G Schneider,
- C Smorra,
- T Tanaka,
- K Blaum,
- Y Matsuda,
- C Ospelkaus,
- W Quint,
- J Walz,
- Y Yamazaki,
- S Ulmer
Affiliations
- S Sellner
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan
- M Besirli
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan
- M Bohman
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan; Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
- M J Borchert
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan; Institut für Quantenoptik, Leibniz Universität Hannover , D-30167 Hannover, Germany
- J Harrington
- Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
- T Higuchi
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan; Graduate School of Arts and Sciences, University of Tokyo , Tokyo 153-8902, Japan
- A Mooser
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan
- H Nagahama
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan; Graduate School of Arts and Sciences, University of Tokyo , Tokyo 153-8902, Japan
- G Schneider
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan; Institut für Physik, Johannes Gutenberg-Universität , D-55099 Mainz, Germany
- C Smorra
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan; CERN, 1211 Geneva, Switzerland
- T Tanaka
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan; Graduate School of Arts and Sciences, University of Tokyo , Tokyo 153-8902, Japan
- K Blaum
- Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
- Y Matsuda
- Graduate School of Arts and Sciences, University of Tokyo , Tokyo 153-8902, Japan
- C Ospelkaus
- Institut für Quantenoptik, Leibniz Universität Hannover , D-30167 Hannover, Germany; Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig, Germany
- W Quint
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- J Walz
- Institut für Physik, Johannes Gutenberg-Universität , D-55099 Mainz, Germany; Helmholtz-Institut Mainz, D-55099 Mainz, Germany
- Y Yamazaki
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan
- S Ulmer
- RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama 351-0198, Japan
- DOI
- https://doi.org/10.1088/1367-2630/aa7e73
- Journal volume & issue
-
Vol. 19,
no. 8
p. 083023
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 $3.15\times {10}^{8}$ equivalent antiproton-seconds, resulting in a lower lifetime limit of ${\tau }_{\bar{{\rm{p}}}}\gt 10.2\,{\rm{a}}$ 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.
Keywords
