Using a data sample of 2.25 x 10^8 J/psi events collected with the BESIII detector, we present the first observation of the decays of eta_c mesons to Sigma+Sigmabar- and Xi-Xibar+. The branching fractions are measured to be (2.11 +- 0.28stat +- 0.18syst +- 0.50PDG) x 10^-3 and (0.89 +- 0.16stat +- 0.08syst +- 0.21PDG) x 10^-3 for eta_c -> Sigma+Sigmabar- and Xi-Xibar+, respectively. These branching fractions provide important information on the helicity selection rule in charmonium-decay processes.
Observation of η_{c} decay into Σ^{+}Σ[over ¯]^{-} and Ξ^{-}Ξ[over ¯]^{+} final states
DESTEFANIS, MARCO GIOVANNI;GRECO, Michela;MAGGIORA, MARCO;SPATARO, STEFANO GIOVANNI;
2013-01-01
Abstract
Using a data sample of 2.25 x 10^8 J/psi events collected with the BESIII detector, we present the first observation of the decays of eta_c mesons to Sigma+Sigmabar- and Xi-Xibar+. The branching fractions are measured to be (2.11 +- 0.28stat +- 0.18syst +- 0.50PDG) x 10^-3 and (0.89 +- 0.16stat +- 0.08syst +- 0.21PDG) x 10^-3 for eta_c -> Sigma+Sigmabar- and Xi-Xibar+, respectively. These branching fractions provide important information on the helicity selection rule in charmonium-decay processes.File in questo prodotto:
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