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A precise measurement of the hypertriton lifetime is presented. In thisletter, the mesonic decay modes $\mathrm{{^3_\Lambda}H \rightarrow ^3He +\pi^-}$ and $\mathrm{{^3_\Lambda}H \rightarrow d + p + \pi^-}$ are used toreconstruct the hypertriton from Au+Au collision data collected by the STARcollaboration at RHIC. A minimum $\chi^2$ estimation is used to determine thelifetime of $\tau = 142^{+24}_{-21}\,{\rm (stat.)} {\pm} 31\,{\rm (syst.)}$ ps.This lifetime is about 50\% shorter than the lifetime $\tau = 263\pm2$ ps of afree $\Lambda$, indicating strong hyperon-nucleon interaction in thehypernucleus system. The branching ratios of the mesonic decay channels arealso determined to satisfy B.R.$_{(^3{\rm He}+\pi^-)}/$(B.R.$_{(^3{\rmHe}+\pi^-)}+$B.R.$_{(d+p+\pi^-)})$ = $0.32\rm{\pm}0.05\,{\rm (stat.)}\pm0.08\,{\rm (syst.)}$. Our ratio result favors the assignment$J(\mathrm{^{3}_{\Lambda}H})$ = $\frac{1}{2}$ over$J(\mathrm{^{3}_{\Lambda}H})$ = $\frac{3}{2}$. These measurements will help toconstrain models of hyperon-baryon interactions.

Measurement of hyper triton lifetime in Au + Au collisions at the Relativistic Heavy-Ion Collider