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

Abstract

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

arXiv comment18 pages, 5 captioned figures, authors from page 13, published version, figures at http://alice-publications.web.cern.ch/node/8432

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