Double charmonium production in exclusive bottomonium decays
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- Braguta, V.V., Likhoded, A.K. & Luchinsky, A.V. Phys. Atom. Nuclei (2010) 73: 1054. doi:10.1134/S1063778810060207
Exclusive bottomonium decays leading to the production of charmonium pairs are considered. The respective decay widths are calculatedwithin the approach of line-cone expansion for the amplitude and nonrelativistic QCD. It is shown that the production of Lz ≠ 0 P-wave charmonium states is possible even in the leading-twist approximation. This means a violation of selection rules that require the suppression of such decays. The reason for this violation is discussed in detail.