Add ch4 keyword to ggHH_quartic
The ch4 parameter was not included as a keyword in the ggF_HH_quartic class. This parameter is necessary in order to have a variable quartic self-coupling in the ggHH_quartic process.
Tagging @bmoser
The ch4 parameter was not included as a keyword in the ggF_HH_quartic class. This parameter is necessary in order to have a variable quartic self-coupling in the ggHH_quartic process.
Tagging @bmoser