Single eta production in heavy quarkonia: breakdown of multipole expansion

Details Single eta production in heavy quarkonia: breakdown of multipole expansion Single eta production in heavy quarkonia: breakdown of multipole expansion

2008-10-02

arxiv.org/abs/0810.0366v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 1 figure

Scientific paper

10.1016/j.physletb.2009.02.025

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. Multipole expansion method is shown to be inadequate for large size systems considered.

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