Measurement of ${}_{\Lambda }^3\mathrm{H}$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The first measurement of ${}_{\Lambda }^3\mathrm{H}$ and ${}_{\overline{\Lambda }}^3\overline{\mathrm{H}}$ differential production with respect to transverse momentum and centrality in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$~TeV is presented. The ${}_{\Lambda }^3\mathrm{H}$ has been reconstructed via its two-charged-body decay channel, i.e., ${}_{\Lambda }^3\mathrm{H}\to {}^3\mathrm{He}+{\pi }^{-}$. A Blast-Wave model fit of the $p_{\mathrm{T}}$-differential spectra of all nuclear species measured by the ALICE collaboration suggests that the ${}_{\Lambda }^3\mathrm{H}$ kinetic freeze-out surface is consistent with that of other nuclei. The ratio between the integrated yields of ${}_{\Lambda }^3\mathrm{H}$ and ${}^3\mathrm{He}$ is compared to predictions from the statistical hadronisation model and the coalescence model, with the latter being favoured by the presented measurements.

21 pages, 4 captioned figures, 1 table, authors from page 15, published version, figures at http://alice-publications.web.cern.ch/node/10995

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Cited by in corpus (3)

• Production characteristics of light nuclei, hypertritons and $\Omega$-hypernuclei in Pb+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV
• Toward a Unified Understanding of the Dense Matter Equation of State
• Flavour-Dependent Chemical Freeze-Out of Light Nuclei in Relativistic Heavy-Ion Collisions