Search for weakly decaying (Lambda n)over-bar and Lambda Lambda exotic bound states in central Pb-Pb collisions at root S-NN=2.76 TeV
Adam, J. and Adamova, D. and Aggarwal, M. M. and Rinella, G. Aglieri and
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Abstract
We present results of a search for two hypothetical strange dibaryon
states, i.e. the H-dibaryon and the possible (Lambda n) over bar bound
state. The search is performed with the ALICE detector in central
(0-10\%) Pb-Pb collisions at root S-NN = 2.76 TeV, by invariant mass
analysis in the decay modes (Lambda n) over bar (d) over bar pi(+) and
H-dibaryon -> Lambda p pi(-). No evidence for these bound states is
observed. Upper limits are determined at 99\% confidence level for a
wide range of liffetimes 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. (C) 2015 CERN for
the benefit of the ALICE Collaboration. Published by Elsevier B.V.... Show more Show less