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

Abstract

A precise measurement of the hypertriton lifetime is presented. In this letter, the mesonic decay modes ${}_{\mathrm{\Lambda }}^3\mathrm{H}{\to }^3\mathrm{He}+{\pi }^{-}$ and ${}_{\mathrm{\Lambda }}^3\mathrm{H}\to \mathrm{d}+\mathrm{p}+{\pi }^{-}$ are used to reconstruct the hypertriton from Au+Au collision data collected by the STAR collaboration at RHIC. A minimum ${\chi }^2$ estimation is used to determine the lifetime of $\tau =142_{-21}^{+24}(stat.)\pm 31(syst.)$ ps. This lifetime is about 50\% shorter than the lifetime $\tau =263\pm 2$ ps of a free $\Lambda$, indicating strong hyperon-nucleon interaction in the hypernucleus system. The branching ratios of the mesonic decay channels are also determined to satisfy B.R.${}_{{(}^3\mathrm{He}+{\pi }^{-})}/$(B.R.${}_{{(}^3\mathrm{He}+{\pi }^{-})}+$B.R.${}_{(d+p+{\pi }^{-})})$ = $0.32\pm 0.05(stat.)\pm 0.08(syst.)$. Our ratio result favors the assignment $J({}_{\mathrm{\Lambda }}^3\mathrm{H})$ = $\frac{1}{2}$ over $J({}_{\mathrm{\Lambda }}^3\mathrm{H})$ = $\frac{3}{2}$. These measurements will help to constrain models of hyperon-baryon interactions.

7 pages, 4 figures, submit for publication

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