Complete nonrelativistic-QCD prediction for prompt double $J/\psi$ hadroproduction

Apr 14, 2016, 11:00 AM
SR4a (DESY Hamburg)


DESY Hamburg

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


Dr Zhiguo He (Hamburg University)


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 prompt $J/\psi$ 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.

Primary author

Dr Zhiguo He (Hamburg University)


Prof. Bernd Kniehl (Hamburg University)

Presentation materials