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Observation of hc Radiative Decay hc → γη' and Evidence for hc → γη M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]
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ArticleSubject(s): BESIII, детектор | чармоний | BEPCII, коллайдерGenre/Form: статьи в журналах Online resources: Click here to access online
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Physical Review Letters Vol. 116, № 25. P. 251802-1-251802-7Abstract: A search for radiative decays of the P-wave spin singlet charmonium resonance hc is performed based on 4.48×108 ψ′ events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels hc→γη′ and γη are observed with a statistical significance of 8.4σ and 4.0σ, respectively, for the first time. The branching fractions of hc→γη′ and hc→γη are measured to be B(hc→γη′)=(1.52±0.27±0.29)×10−3 and B(hc→γη)=(4.7±1.5±1.4)×10−4, respectively, where the first errors are statistical and the second are systematic uncertainties.
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A search for radiative decays of the P-wave spin singlet charmonium resonance hc is performed based on 4.48×108 ψ′ events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels hc→γη′ and γη are observed with a statistical significance of 8.4σ and 4.0σ, respectively, for the first time. The branching fractions of hc→γη′ and hc→γη are measured to be B(hc→γη′)=(1.52±0.27±0.29)×10−3 and B(hc→γη)=(4.7±1.5±1.4)×10−4, respectively, where the first errors are statistical and the second are systematic uncertainties.
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