Contribution of Colour-singlet Process $Υ\to J/Ψ+ c\bar{c}g$ to $Υ\to J/Ψ+ X$

Details Contribution of Colour-singlet Process $Υ\to J/Ψ+ c\bar{c}g$ to $Υ\to J/Ψ+ X$ Contribution of Colour-singlet Process $Υ\to J/Ψ+ c\bar{c}g$ to $Υ\to J/Ψ+ X$

1999-12-14

arxiv.org/abs/hep-ph/9912328v2

Phys.Lett. B482 (2000) 65-70

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex 2.0 format, 12 pages, 3 ps figures

Scientific paper

10.1016/S0370-2693(00)00439-1

We show that the colour-singlet process $\Upsilon \to J/\Psi + c\bar{c}g$ significantly contributes to the inclusive process $\Upsilon \to J/\Psi + X$. We calculate the partial width and the momentum distribution of the produced $J/\Psi$ in this channel. The obtained width is comparable to the experimental data. The momentum distribution is fairly soft, which is in contrast to the results from the colour-octet processes discussed earlier in literature but is consistent with the CLEO measurements. Further experiments to check this contribution are suggested.

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