Exclusive photoproduction of $B_c^{\pm }$ and bottomonia pairs

Abstract

In this paper we analyze the photoproduction of heavy quarkonia pairs which include $b$-quarks, such as $B_c^{+}{B}_c^{-}$-mesons or charmonium-bottomonium pairs. Compared to charmonia pair production, these channels get contributions only from some subsets of diagrams, and thus allow for a better theoretical understanding of different production mechanisms. In contrast to the production of hidden-flavor quarkonia, for the production of $B_c$-meson pairs there are no restrictions on internal quantum numbers in the suggested mechanisms. Using the Color Glass Condensate approach, we estimated numerically the production cross-sections in the kinematics of the forthcoming Electron-Proton collider and in the kinematics of ultraperipheral collisions at LHC. We found that the production of $J/\psi {\eta }_c$ and $B_c^{+}{B}_c^{-}$ meson pairs are the most promising channels for studies of quarkonia pair production.

Comments: 15 pages, 8 figures. Extension of the approach developed in arXiv:2202.03288 to the production of heavy quarkonia pairs which include b-quarks