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

ALICE Collaboration

doi:10.1016/j.physletb.2019.134905

paper

$_{Λ}^{3} H$ and $_{Λ ˉ}^{3} H ˉ$ lifetime measurement in Pb-Pb collisions at $s_{NN} =$ 5.02 TeV via two-body decay

arXiv:1907.06906 · doi:10.1016/j.physletb.2019.134905

Abstract

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

20 pages, 5 captioned figures, 2 tables, authors from page 15, published version, figures at http://alice-publications.web.cern.ch/node/5456

Λ3​H and Λˉ3​Hˉ lifetime measurement in Pb-Pb collisions at sNN​​= 5.02 TeV via two-body decay

Abstract

$_{Λ}^{3} H$ and $_{Λ ˉ}^{3} H ˉ$ lifetime measurement in Pb-Pb collisions at $s_{NN} =$ 5.02 TeV via two-body decay