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

Abstract: We perform a complete study of prompt double $J/\psi$ hadroproduction at leading order in the nonrelativistic-QCD factorization framework by including all possible pairings of the $c\bar{c}$ Fock states ${}^1!S_0^{[8]}$, ${}^3!S_1^{[1,8]}$, and ${}^3!P_J^{[1,8]}$ with $J=0,1,2$. We find that the ${}^1!S_0^{[8]}$ and ${}^3!P_J^{[8]}$ channels of $J/\psi$ and $\psi^\prime$ production and the ${}^3!P_J^{[1]}$ and ${}^3!S_1^{[8]}$ channels of $\chi_{cJ}$ production, which have been overlooked so far, greatly dominate at large invariant masses and rapidity separations of the $J/\psi$ 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.