Gluon Fusion induced Zg and Zgg Productions in the Standard Model at the   LHC
  We report calculations of the gluon induced Zg and Zgg productions in the Standard Model at the LHC operating at both 7 TeV and 14 TeV collision energy. We present total cross sections and differential distributions of the processes and compare them with the leading and next-to-leading order QCD pp -> Z+1 jet, Z+2 jets results. Our results show that the gluon induced Zg and Zgg productions contribute to pp -> Z+1 jet, Z+2 jets at 1% level. 
Gao Xiangdong, Qiang Li, Cai-Dian L\"u
hep-ph