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- Title
A new analysis improving the evidence of a narrow peak in the invariant-mass distribution of the $ \Lambda$p system observed in the $ \bar{{p}}$ annihilation at rest on <sup>4</sup>He.
- Authors
Bendiscioli, G.; Bressani, T.; Lavezzi, L.; Salvini, P.
- Abstract
The presence of a narrow peak in the $ \Lambda$ p invariant-mass distribution observed in the $ \bar{{p}}$ annihilation reaction at rest $\ensuremath \bar{p} {}^4\mathrm{He}\rightarrow p\pi^-p\pi^+\pi^-n X$ is discussed again through an analysis procedure which improves the ratio signal/background in comparison with the previous analysis. The peak is centred at 2223.2±3.2stat±1.2syst MeV and has a statistical significance of 4.7 $ \sigma$ , values compatible with those published previously. If interpreted as the result of the decay into $ \Lambda$ p of a $\ensuremath { }_{\bar{K}}{}^2\mathrm{H}$ bound system, the corresponding binding energy should be B = - 151.0±3.2stat±1.2syst MeV and the width $ \Gamma_{{FWHM}}^{}$ < 33.9±6.2 MeV. The production rate has a lower limit of 1.2 10-4. Data on the $ \bar{{p}}$ annihilation reaction at rest $ \bar{{p}}$4He $ \rightarrow$ p $ \pi^{-}_{}$ p $ \pi^{-}_{}$ ps X , analyzed for the first time, lead to a result in qualitative agreement with the previous one.
- Subjects
HYPERONS; ANNIHILATION reactions; PARTICLES (Nuclear physics); NUCLEAR reactions; EXOTIC atoms; MESONS; ANTIPROTONS
- Publication
European Physical Journal A -- Hadrons & Nuclei, 2009, Vol 40, Issue 1, p11
- ISSN
1434-6001
- Publication type
Article
- DOI
10.1140/epja/i2008-10735-x