On the measured lifetime of light hypernuclei 3 Λ H and 4 Λ H
Creators
- 1. GSI Helmholtz Centre for Heavy Ion Research, Planckstrasse 1, Darmstadt, 64291, Germany
- 2. The Helmholtz Institute Mainz (HIM), J.J. Becherweg 40, Mainz, 55099, Germany
- 3. KVI, University of Groningen, Zernikelaan 25, Groningen, NL-9747 AA, The Netherlands
- 4. Seoul National University, Gwanakro Sillim-dong, Gwanak-gu, Seoul, 151-747, Republic of Korea
- 5. Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan
Description
A statistical combination of the experimental lifetime estimations available in the literatures is performed for 3 Λ H and 4 Λ H, including several recent measurements. The combined average values of the lifetime for 3 Λ H and 4 Λ H are respectively 216−16+19 ps and 192−18+20 ps with a reduced χ2 of 0.89 and 0.48. A new insight into the lifetime estimation of the HypHI Phase 0 experiment by a Bayesian approach is also presented. In this approach, several different prior distributions including the combination of previous lifetime data and a Jeffrey prior are used. The principal mode and the smallest credible interval at 68% of the posterior distribution, given by the prior belief of the previous measurements, are 217−16+19 ps and 194−18+20 ps respectively for 3 Λ H and 4 Λ H. The two employed approaches have revealed that the lifetime of hypernuclei 3 Λ H and 4 Λ H can be shorter than the Λ –hyperon lifetime.
Files
j.physletb.2013.12.037.pdf
Files
(426.7 kB)
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