Speaker
Dr
Zhiguo He
(Hamburg University)
Description
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)
Co-author
Prof.
Bernd Kniehl
(Hamburg University)
