The resonance parameters of the charmonium ground state, η c(1 1S 0), have been measured by means of the reaction p̄p→η c→γγ. The mass and total width are determined to be 2984.1 ± 2.1 ± 1.0 MeV/c 2 and 20.4 -6.7 +7.7 ± 2.0 MeV, respectively. The product of branching ratios B(p̄p→η c)B(η c→γγ) is determined to be (22.4 -3.7 +3.8 ± 2.0) × 10 -8, from which B(η c→γγ)=(1.87 -0.31-0.50 +0.32+0.95) × 10 -4, and Γ(η c→γγ)=3.8 -1.0-1.0 +1.1+1.9 keV are derived using B(η c→p̄p)= (12 ± 4) × 10 -4 from the literature.
Measurement of the resonance parameters of the charmonium ground state,
LO VETERE, MAURIZIO;MARINELLI, MAURO;PALLAVICINI, MARCO;PATRIGNANI, CLAUDIA;SANTRONI, ALBERTO;
2003-01-01
Abstract
The resonance parameters of the charmonium ground state, η c(1 1S 0), have been measured by means of the reaction p̄p→η c→γγ. The mass and total width are determined to be 2984.1 ± 2.1 ± 1.0 MeV/c 2 and 20.4 -6.7 +7.7 ± 2.0 MeV, respectively. The product of branching ratios B(p̄p→η c)B(η c→γγ) is determined to be (22.4 -3.7 +3.8 ± 2.0) × 10 -8, from which B(η c→γγ)=(1.87 -0.31-0.50 +0.32+0.95) × 10 -4, and Γ(η c→γγ)=3.8 -1.0-1.0 +1.1+1.9 keV are derived using B(η c→p̄p)= (12 ± 4) × 10 -4 from the literature.
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