Observation of Double [Formula presented] Production in [Formula presented] Annihilation at [Formula presented]
Journal
Physical Review Letters
Journal Volume
89
Journal Issue
14
Date Issued
2002
Author(s)
Abe, K. et al.
Abe, K.
Abe, R.
Abe, T.
Adachi, I.
Ahn, B.S.
Ahn, B.S.
Aihara, H.
Akatsu, M.
Asano, Y. .
Aso, T.
Aulchenko, V.
Aushev, T
Abstract
We report the observation of prompt J/psi via double cc; production from the e+e- continuum. In this process one cc; pair fragments into a J/psi meson while the remaining pair either produces a charmonium state or fragments into open charm. Both cases have been experimentally observed. We find cross sections of sigma[e+e- -->J/psieta(c)(gamma)]xB(eta(c)-->>or=4 charged)=(0.033(+0.007)(-0.006)+/-0.009) pb and sigma(e+e- -->J/psiD(*+)X)=(0.53(+0.19)(-0.15)+/-0.14) pb and infer sigma(e+e- -->J/psicc;)/sigma(e+e- -->J/psiX)=0.59(+0.15)(-0.13)+/-0.12. These results are obtained from a 46.2 fb(-1) data sample collected near the Upsilon(4S) resonance, with the Belle detector at the KEKB collider.
Type
journal article