Production of two $J/\psi$ mesons in proton-proton collisions at the LHC

Abstract

We discuss inclusive production of pairs of $J/\psi$ quarkonia. Both leading-order single parton (box) contribution and double-parton contributions are included. In addition we discuss a contribution of higher-order two-gluon exchange and a feed down from double ${\chi }_c$ production. The second two contributions are important for large rapidity distance between the two $J/\psi$ mesons and for relatively large cut-offs on quarkonia transverse momenta. A relation to current experiments is discussed.

Comments: 6 pages, 3 figures, a talk at the EDS Blois workshop, Prague, Czech Republic, June 26-30, 2017, international workshop Low-x 2017, Bisceglie, Italy, June 12-18, 2017, EPS2017 conference, Venice 2017, July 4-12, 2017