Measurement of the e+ e- ---> J/psi c anti-c cross section at s**(1/2) ~10.6-GeV

We present a new measurement of the e+e- -> J/psi ccbar cross section where the ccbar pair can fragment either into charmed hadrons or a charmonium state. In the former case the J/psi and a charmed hadron are reconstructed, while the latter process is measured using the recoil mass technique, which allows the identification of two-body final states without reconstruction of one of the charmonia. The measured e+e- -> J/psi ccbar cross section is (0.74 +- 0.08 + 0.09 - 0.08) pb, and the e+e- -> J/psi non-ccbar cross section is (0.43 +- 0.09 +-0.09) pb. We note that the measured cross sections are obtained from a data sample with the multiplicity of charged tracks in the event larger than four/ corrections for the effect of this requirement are not performed as this cannot be done in a model-independent way. The analysis is based on a data sample with an integrated luminosity of 673/fb recorded near the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- asymmetric-energy collider.

Note:

9 pages, 4 figures

14.40.Gx
13.66.Bc
12.38.Bx
mass: recoil
electron positron: annihilation
J/psi(3100): electroproduction
charmonium: decay
charm: pair production
channel cross section
BELLE

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