Search for weakly decaying $\overline{\Lambda\mathrm{n}}$ and $\Lambda\Lambda $ exotic bound states in central Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Physics Letters B Année : 2016

Search for weakly decaying $\overline{\Lambda\mathrm{n}}$ and $\Lambda\Lambda $ exotic bound states in central Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV

J. Adam
C. Roy
Laurent Aphecetche
Guillaume Batigne
B. Cheynis
Marie Germain
J.-Y. Grossiord
  • Fonction : Auteur
Gines Martinez Garcia
Philippe Pillot
Alexandre Shabetai
Diego Stocco

Résumé

We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible $\overline{\Lambda\mathrm{n}}$ bound state. The search is performed with the ALICE detector in central (0-10%) Pb-Pb collisions at $ \sqrt{s_{\rm{NN}}} = 2.76$ TeV, by invariant mass analysis in the decay modes $\overline{\Lambda\mathrm{n}} \rightarrow \overline{\mathrm{d}} \pi^{+} $ and H-dibaryon $\rightarrow \Lambda \mathrm{p} \pi^{-}$. 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.

Dates et versions

in2p3-01172187 , version 1 (07-07-2015)

Identifiants

Citer

J. Adam, G. Conesa Balbastre, J. Faivre, C. Furget, R. Guernane, et al.. Search for weakly decaying $\overline{\Lambda\mathrm{n}}$ and $\Lambda\Lambda $ exotic bound states in central Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV. Physics Letters B, 2016, 752, pp.267-277. ⟨10.1016/j.physletb.2015.11.048⟩. ⟨in2p3-01172187⟩
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