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Original version
Sellner, S.; Besirli, M.; Bohman, M.; Borchert, M.J.; Harrington, J. et al.: Improved limit on the directly measured antiproton lifetime. In: New Journal of Physics 19 (2017), Nr. 8, 83023. DOI: https://doi.org/10.1088/1367-2630/aa7e73
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 3.15x108 equivalent antiproton-seconds, resulting in a lower lifetime limit of Tp > 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.