Article

# Single eta production in heavy quarkonia transitions

07/2008;
Source: arXiv

ABSTRACT The $\eta$ production in the $(n,n')$ bottomonium transitions $\Upsilon (n) \to \Upsilon (n') \eta,$ is studied in the method used before for dipion heavy quarkonia transitions. The widths $\Gamma_\eta(n,n')$ are calculated without fitting parameters for $n=2,3,4,5, n'=1$.Resulting $\Gamma_\eta(4,1)$ is found to be large in agreement with recent data.

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### Keywords

$\eta$ production

dipion heavy quarkonia transitions