Search for weakly decaying and ΛΛ exotic bound states in central Pb–Pb collisions at
We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible $$\overline{Λn}$$ bound state. The search is performed with the ALICE detector in central (0–10%) Pb–Pb collisions at $$\sqrt{s}$$$$_ {NN}$$= 2.76 TeV, by invariant mass analysis in the decay modes $$\overline{Λn}$$ →$$\bar{d}$$π+ and H-dibaryon →Λpn- . 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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)
- Contributing Organization:
- The ALICE Collaboration; ALICE Collaboration
- Grant/Contract Number:
- AC05-00OR22725; AC02-05CH11231; AC52-07NA27344
- OSTI ID:
- 1227234
- Alternate ID(s):
- OSTI ID: 1343506; OSTI ID: 1379027; OSTI ID: 1480417
- Report Number(s):
- LLNL-JRNL-737508; S0370269315009041; PII: S0370269315009041
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 752 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
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