Prompt double J/ψ production in proton-proton collisions at the LHC

Apr 14, 2016, 11:40 AM
SR4a (DESY Hamburg)


DESY Hamburg

Heavy Flavours (Charm, Beauty and Top) WG4 Heavy Flavours


Sergey Baranov (Lebedev Institute of Physics)


We provide a detailed study of prompt double J/ψ production within the non-relativistic QCD (NRQCD) framework in proton-proton collisions at the LHC. We confront the recent LHC data with the results obtained at leading-order (LO) in the NRQCD framework within two approaches of the collinear factorization and the kT-factorization. We show that the LHCb data can be fairly described within the kT-factorized LO NRQCD, while the collinearly factorized LO NRQCD significantly overshoots the LHCb data at low J/ψ-pair invariant mass. We show that the LO NRQCD formalism cannot describe the recent CMS data, with about one order of magnitude discrepancy. If the CMS data are confirmed, this indicates rather large higher-order corrections for prompt double J/ψ production. We provide various predictions which can further test the NRQCD-based approach at the LHC in a kinematic region that LO contributions dominate.

Primary author

Amir Rezaeian (niversidad Tecnica Federico Santa Maria)


Sergey Baranov (Lebedev Institute of Physics)

Presentation materials