Search for the $\eta$-mesic $^{4}He$ with WASA-at-COSY
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dc.type
JournalArticle
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dc.abstract.en
We conduct a search for the He − $\eta$ bound state with the WASA-at-COSY facility measuring the excitation functions for the reaction channels: $dd \rightarrow ^{3}Hep \pi^{-}$ and $dd \rightarrow ^{3}Hen \pi^{0}$, where the outgoing N − π pairs originate from the conversion of the $\eta$ meson on a nucleon inside the He nucleus. Two dedicated experiments were performed at the Cooler Synchrotron COSY-Jülich with the WASA detector. The analysis of the 2008 data shows no signal of the $^{4}He− \eta$ bound state. An upper limit for the cross-section for the bound state formation and decay in the process $dd \rightarrow (^{4}He- \eta)_{bound} \rightarrow ^{3}Hep \pi^{-}$, was determined at the 90 % confidence level. In November 2010 a new data set was collected.
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dc.description.volume
66
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dc.description.publication
0,34
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dc.description.conftype
international
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dc.identifier.doi
10.1051/epjconf/20146609009
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dc.identifier.eissn
2100-014X
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dc.title.journal
EPJ Web of Conferences
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dc.title.volume
INPC 2013 – International Nuclear Physics Conference, Firenze, Italy, June 2-7, 2013
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dc.contributor.institution
WASA-at-COSY Collaboration
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dc.language.container
eng
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dc.affiliation
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
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dc.subtype
ConferenceProceedings
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dc.conference
INPC 2013 – International Nuclear Physics Conference; 2013-06-02; 2013-06-07; Florencja; Włochy; indeksowana w Web of Science; indeksowana w Scopus; ;
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dc.identifier.articleid
09009
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dc.rights.original
CC-BY; otwarte czasopismo; ostateczna wersja wydawcy; w momencie opublikowania; 0;