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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/305801
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