Search for weakly decaying Λ̅ n̅ and ΛΛ exotic bound states in central Pb–Pb collisions at √sNN = 2.76 TeV

Research output: Contribution to journalArticle


  • ALICE Collaboration

Colleges, School and Institutes


We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible Λ̅n̅ bound state. The search is performed with the ALICE detector in central (0–10%) Pb–Pb collisions at √sNN = 2.76  TeV, by invariant mass analysis in the decay modes Λ̅ ̅n̅→ d̅π+ and H-dibaryon → Λpπ-. No evidence for these bound states is observed. Upper limits are determined at 99% confidence level for a wide range of lifetimes and for the full range of branching ratios. The results are compared to thermal, coalescence and hybrid UrQMD model expectations, which describe correctly the production of other loosely bound states, like the deuteron and the hypertriton.

Bibliographic note

Lee Barnby - Physics Working Group Convenor at inception and during writing, responsible for approving analysis


Original languageEnglish
Pages (from-to)267-277
Number of pages11
JournalPhysics Letters B
Publication statusPublished - 10 Jan 2016