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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:: The cross section of the γγ→Bc(Bc ∗)bˉc process is calculated. It is shown that near threshold the pseudoscalar state production is much suppressed with respect to the vector one. At large energies their ratio becaims σ(Bc ∗)/sigma(Bc)∼4. The process of heavy quark recombination dominates in the production of Bc(Bc ∗) states. The fragmentation process b→Bc comes to play at high pt values only, while its contribution will remain nondominant.