Measurement of the lifetime and $\Lambda$ separation energy of $^{3}_{\Lambda}\mathrm H$

The ALICE collaboration
CERN-EP-2022-188, 2022.

Abstract (data abstract)
The most precise measurements to date of the $^{3}_{\Lambda}\mathrm H$ lifetime $\tau_{^{3}_{\Lambda}\mathrm H}$ and $\Lambda$ separation energy $\mathrm{B_{\Lambda}}$ are obtained using the data sample of Pb--Pb collisionsat $\sqrt{s_{\mathrm{NN}}}=$5.02 TeV collected by the ALICE experiment at the LHC. The ^{3}_{\Lambda}\mathrm H is reconstructed via its charged two-body mesonic decay channel ($^{3}_{\Lambda}\mathrm H$ $\rightarrow$ $^3$He + $\pi^-$and the charge-conjugate process). The measured values $\tau_{^{3}_{\Lambda}\mathrm H} = [253 \pm 11 \text{~(stat.)} \pm 6 \text{~(syst.)}]$ ps and $\mathrm{B_{\Lambda}} = [102 \pm 63 \text{~(stat.)} \pm 67 \text{~(syst.)}]$ keV are compatible with predictions from effective field theories and conclusively confirm that the $^{3}_{\Lambda}\mathrm H$ is a weakly-bound system.

  • Table 1

    Data from Figure 3


    $^{3}_{\Lambda}\mathrm H$ Lifetime and $\mathrm{B_{\Lambda}}$

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