Abstract
An improved measurement of the lifetime is presented. In this paper, the mesonic decay modes + and are used to reconstruct the from Au+Au collision data collected by the STAR collaboration at Relativistic Heavy Ion Collider (RHIC). A minimum estimation is used to determine the lifetime of ps. This lifetime is about 50% shorter than the lifetime ps of a free , indicating strong hyperon-nucleon interaction in the hypernucleus system. The branching ratios of the mesonic decay channels are also determined to satisfy . Our ratio result favors the assignment over . These measurements will help to constrain models of hyperon-baryon interactions.
- Received 3 October 2017
- Revised 11 February 2018
DOI:https://doi.org/10.1103/PhysRevC.97.054909
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