Measurement of $J / ψ$ Production in Continuum $e^{+} e^{-}$ Annihilations near $\sqrt s = 10.6 GeV$

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27 September 2001

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 87 (16) , 162002
https://doi.org/10.1103/physrevlett.87.162002

Abstract

The production of

J / ψ

mesons in continuum

e^{+} e^{-}

annihilations has been studied with the BABAR detector at energies near the

ϒ (4 S)

resonance. The mesons are distinguished from

J / ψ

production in

B

decays through their center-of-mass momentum and energy. We measure the cross section

e^{+} e^{-} \to J / ψ X

to be

2.52 \pm 0.21 \pm 0.21 pb

. We set a

90 %

C.L. upper limit on the branching fraction for direct

ϒ (4 S) \to J / ψ X

decays at

4.7 \times 10^{- 4}

.

Keywords

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