Abstract
An improved value for the lifetime of the (anti-)hypertriton has been obtained using the data sample of Pb–Pb collisions at sNN=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 dN/d(ct) spectrum. The measured value, τ=242−38+34 (stat.) ± 17 (syst.) ps, is compatible with representative theoretical predictions, thus contributing to the solution of the longstanding hypertriton lifetime puzzle.
Highlights
Hypernuclei are bound states of nucleons and hyperons and they are mainly produced by means of (K −, π −), (π +, K +) and (e,e K +) reactions on stable nuclear targets [1,2]
The knowledge of this interaction has become more relevant in recent years due to its connection to the modeling of astrophysical objects like neutron stars [3,4]
The presence of hyperons as additional degrees of freedom leads to a considerable softening of the matter equation of state (EOS)
Summary
Article history: Received 26 July 2019 Received in revised form 22 August 2019 Accepted 29 August 2019 Available online 3 September 2019 Editor: L. 17 (syst.) ps, is compatible with representative theoretical predictions, contributing to the solution of the longstanding hypertriton lifetime puzzle
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