Photonic production of B_c-mesons

Abstract

The cross section of the $\gamma \gamma \to B_c(B_c^{\ast })\bar{b}c$ 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 $\sigma (B_c^{\ast })/sigma(B_c)\sim 4$. The process of heavy quark recombination dominates in the production of $B_c(B_c^{\ast })$ states. The fragmentation process $b\to B_c$ comes to play at high $p_t$ values only, while its contribution will remain nondominant.

Comments: Preprint IHEP 94-82