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

STAR Collaboration,; Adamczyk, L.; Schmitz, N.; Seyboth, P.; et al.,

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

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STAR Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Adamczyk, L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schmitz, N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Seyboth, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al.,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

STAR Collaboration, Adamczyk, L., Schmitz, N., Seyboth, P., & et al. (2018). Measurement of hyper triton lifetime in Au + Au collisions at the Relativistic Heavy-Ion Collider. Physical Review C, (97), 054909. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-319.

Cite as: https://hdl.handle.net/21.11116/0000-0003-F8D1-9

Abstract

A precise measurement of the hypertriton lifetime is presented. In this letter, the mesonic decay modes $\mathrm{{^3_Λ}H \rightarrow ^3He + π^-}$ and $\mathrm{{^3_Λ}H \rightarrow d + p + π^-}$ are used to reconstruct the hypertriton from Au+Au collision data collected by the STAR collaboration at RHIC. A minimum $χ^2$ estimation is used to determine the lifetime of $τ= 142^{+24}_{-21}\,{\rm (stat.)} {\pm} 31\,{\rm (syst.)}$ ps. This lifetime is about 50\% shorter than the lifetime $τ= 263\pm2$ ps of a free $Λ$, indicating strong hyperon-nucleon interaction in the hypernucleus system. The branching ratios of the mesonic decay channels are also determined to satisfy B.R.$_{(^3{\rm He}+π^-)}/$(B.R.$_{(^3{\rm He}+π^-)}+$B.R.$_{(d+p+π^-)})$ = $0.32\rm{\pm}0.05\,{\rm (stat.)}\pm 0.08\,{\rm (syst.)}$. Our ratio result favors the assignment $J(\mathrm{^{3}_ΛH})$ = $\frac{1}{2}$ over $J(\mathrm{^{3}_ΛH})$ = $\frac{3}{2}$. These measurements will help to constrain models of hyperon-baryon interactions.