Photonic production of P-wave states of Bc mesons

Numerical calculations for the production of P-wave levels of Bc quarkonium in γγ collisions are performed in the leading O(αs2αem2) 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 b → 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, w