Measurement of the resonance parameters of the charmonium ground state, ηc(11S0)
Physics Letters B(2003)
摘要
The resonance parameters of the charmonium ground state, ηc(11S0), have been measured by means of the reaction p̄p→ηc→γγ. The mass and total width are determined to be 2984.1±2.1±1.0 MeV/c2 and 20.4+7.7−6.7±2.0 MeV, respectively. The product of branching ratios B(p̄p→ηc)B(ηc→γγ) is determined to be 22.4+3.8−3.7±2.0×10−8, from which B(ηc→γγ)=1.87+0.32+0.95−0.31−0.50×10−4, and Γ(ηc→γγ)=3.8+1.1+1.9−1.0−1.0 keV are derived using B(ηc→p̄p)=(12±4)×10−4 from the literature.
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关键词
13.20.Gd,13.40.Hq,13.75.Cs,14.40.Gx
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