Photonic production of S- and P wave B/c states and doubly heavy baryonsстатья
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Аннотация:Numerical calculations for the production ofS-andP-wave levels of Bc quarkonium inγγ collisions are performed in the leading O(α s 2 α em 2 ) order of perturbation theory. The total cross-section ofP-wave state production is about 10 % of that for theS-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 →B c fragmentation (6 diagrams) quite accurately reproduces the result of the fragmentation model, whereas there is a strong deviation of thec→B c fragmentation term from the predictions of the fragmentation model. The total cross-sections in photonic production of doubly heavy diquark, hadronizing into the baryons, are evaluated.