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$^3_\Lambda\mathrm{H}$ and $^3_{\bar{\Lambda}}\mathrm{\overline{H}}$ lifetime measurement in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}} = $ 5.02 TeV via two-body decay

The ALICE collaboration
Phys.Lett.B 797 (2019) 134905, 2019.

Abstract (data abstract)
An improved value for the lifetime of the hypertriton has been obtained using the data sample of Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV collected by the ALICE experiment at the LHC. The (anti-)hypertriton has been identified via its charged two-body mesonic decay channel and the lifetime has been determined with an exponential fit to the d$N$/d($c$t) spectrum. The measured value, $\tau$ = 242$^{+34}_{-38}$ (stat.) $\pm$ 17 (syst.) ps, is in agreement within 1$\sigma$ with the free $\Lambda$ lifetime. This result is compatible with all the available theoretical predictions, thus contributing to the solution of the longstanding hypertriton lifetime puzzle.

  • Table 1

    Data from Fig.3


    (Hypertriton + Anti-Hypertriton)dN/d(ct) distribution.

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