Complete Nonrelativistic-QCD Prediction for Prompt Double $J/ψ$ Hadroproduction

Zhi-Guo He; Bernd A. Kniehl

Paper

Complete Nonrelativistic-QCD Prediction for Prompt Double $J/ψ$ Hadroproduction

Abstract

We perform a complete study of prompt double

hadroproduction at leading order in the nonrelativistic-QCD factorization framework by including all possible pairings of the

Fock states

, and

with

. We find that the

and

channels of

and

production and the

and

channels of

production, which have been overlooked so far, greatly dominate at large invariant masses and rapidity separations of the

pair, and that their inclusion nearly fills the large gap between previous incomplete predictions within the color-singlet model and the recent measurement by the CMS Collaboration at the CERN LHC, leaving room for next-to-leading-order corrections of typical size.