Measurement of the cross-section of Z$\gamma$ and limits on ADD model at the CMS with $7$~TeV LHC data

The measurement of the inclusive cross-section for Z$\gamma$ production at LHC with $7$~TeV proton-proton collision is presented. The electron and muon decay modes are used to reconstruct the Z-boson. The total cross-section is measured for photon transverse energy greater than $10$~GeV and with photon and charged lepton separation in the pseudorapidity-azimuthal angle plane greater than $0.7$. This study is extended by a measurement of Z$(\nu\overline{\nu})\gamma $ cross section. A search is performed for extra dimensions in the Arkani-Hamed, Dimopoulos, Dvali framework using the final state of a graviton and photon. The limits are extended with MD~$>1.25-1.31$~TeV for n~$=~2-6$. The measurement is found to be in agreement with the standard model prediction.