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Search for weakly decaying [lambda]n[bar] and [lambda][lambda] exotic bound states in central Pb–Pb collisions at √sNN=2.76 TeV

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We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible Λn‾ 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 Λn‾→d‾π+ and H-dibaryo...

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Main Authors: Adam, Jaroslav (Author) , Angelov, Venelin (Author) , Busch, Oliver (Author) , Deisting, Alexander (Author) , Fleck, Martin (Author) , Glässel, Peter (Author) , Knichel, Michael Linus (Author) , Leardini, Lucia (Author) , Mercado Pérez, Jorge (Author) , Oyama, Ken (Author) , Pachmayer, Yvonne C. (Author) , Reygers, Klaus (Author) , Schicker, Rainer (Author) , Stachel, Johanna (Author) , Stiller, Johannes Hendrik (Author) , Völkl, Martin (Author) , Wilkinson, Jeremy (Author) , Windelband, Bernd (Author) , Winn, Michael (Author) , Zimmermann, Alice (Author)
Corporate Author: ALICE (Author)
Format: Article (Journal)
Language:English
Published: 2016
In: Physics letters
Year: 2015, Volume: 752, Pages: 267-277
ISSN:1873-2445
DOI:10.1016/j.physletb.2015.11.048
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.physletb.2015.11.048
Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S0370269315009041
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Author Notes:ALICE Collaboration*
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Summary:We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible Λn‾ 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 Λn‾→d‾π+ 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.
Item Description:Available online 28 November 2015
*ALICE Collaboration: J. Adam, V. Anguelov, O. Busch, A. Deisting, M.G. Fleck, P. Glaessel, M.L. Knichel, L. Leardini, J. Mercado Perez, K. Oyama, Y. Pachmayer, K. Reygers, R. Schicker, J. Stachel, J. Stiller, M.A. Voelkl, J. Wilkinson, B. Windelband, M. Winn, A. Zimmermann [und 954 weitere Personen]
Im Titel ist "Lamdba" als griechischer Buchstabe dargestellt
Im Titel steht das Ausdruck "Lambdan" mit einem Oberstrich
Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol
Gesehen am 22.07.2020
Physical Description:Online Resource
ISSN:1873-2445
DOI:10.1016/j.physletb.2015.11.048

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