We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible View the MathML sourceΛn‾ bound state. The search is performed with the ALICE detector in central (0–10%) Pb–Pb collisions at View the MathML sourcesNN=2.76 TeV, by invariant mass analysis in the decay modes View the MathML sourceΛn‾→d‾π+ and H-dibaryon →Λpπ−→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.

Search for weakly decaying Λn and ΛΛ exotic bound states in central Pb-Pb collisions at sNN=2.76 TeV

CORTESE, Pietro;RAMELLO, Luciano;SITTA, Mario;
2016-01-01

Abstract

We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible View the MathML sourceΛn‾ bound state. The search is performed with the ALICE detector in central (0–10%) Pb–Pb collisions at View the MathML sourcesNN=2.76 TeV, by invariant mass analysis in the decay modes View the MathML sourceΛn‾→d‾π+ and H-dibaryon →Λpπ−→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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11579/82715
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