Photonic production of P wave states of B(c) mesonsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Numerical calculations for the production of P-wave levels of Bc quarkonium in γγ collisions are performed in the leading O(αs 2αem 2) order of perturbation theory. The total cross-section of P-wave state production is about 10 \% of that for the S-wave levels. The contribution of fragmentation component (6+6 diagrams) is low, and the basic contribution is determined by the recombination mechanism (8 Feynman diagrams). The gauge invariant term of the bˉ→Bc fragmentation (6 diagrams) quite accurately reproduces the result of the fragmentation model, whereas there is a strong deviation of the c→Bc fragmentation term from the predictions of the fragmentation model.