Is the colour-octet mechanism consistent with the double $J/\psi$ production measurement at B-factories?

Yu Feng, Zhan Sun, Hong-Fei Zhang

Double $J/\psi$ production in $e^{+}{e}^{-}$ collisions involving colour-octet channels are evaluated up to order ${\alpha }^2{\alpha }_s^3$. Having implemented the variation of the parameters ($m_c$, $μ_r…