We study e+e-→J/ψ cc̅ by measuring the invariant mass distribution recoiling against fully reconstructed J/ψ decays, using 124 fb-1 of data collected at a center-of-mass energy of 10.6 GeV with the BABAR detector. We observe signals for ηc(1S), χc0, and ηc(2S) in the recoil mass distribution, thus confirming previous measurements. We measure σ(e+e-→J/ψ+cc̅ )B(cc̅ →>2 charged) to be 17.6±2.8(stat)-2.1+1.5(syst) fb, 10.3±2.5(stat)-1.8+1.4(syst) fb, and 16.4±3.7(stat)-3.0+2.4(syst) fb with cc̅ =ηc(1S), χc0, and ηc(2S), respectively.
Measurement of double charmonium production in e+e- annihilations at s=10.6 GeV
CONTRI, ROBERTO;LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;PATRIGNANI, CLAUDIA;SANTRONI, ALBERTO;TOSI, SILVANO;
2005-01-01
Abstract
We study e+e-→J/ψ cc̅ by measuring the invariant mass distribution recoiling against fully reconstructed J/ψ decays, using 124 fb-1 of data collected at a center-of-mass energy of 10.6 GeV with the BABAR detector. We observe signals for ηc(1S), χc0, and ηc(2S) in the recoil mass distribution, thus confirming previous measurements. We measure σ(e+e-→J/ψ+cc̅ )B(cc̅ →>2 charged) to be 17.6±2.8(stat)-2.1+1.5(syst) fb, 10.3±2.5(stat)-1.8+1.4(syst) fb, and 16.4±3.7(stat)-3.0+2.4(syst) fb with cc̅ =ηc(1S), χc0, and ηc(2S), respectively.File in questo prodotto:
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