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Leptonic decays of W/Z bosons provide the first electroweak precisionmeasurements at the Large Hadron Collider (LHC). The results of measurements ofinclusive W and Z boson production cross sections in pp collisions at$\sqrt{s}=7 \mathrm{TeV}$ are presented, based on 2.9 pb$^{-1}$ of datarecorded by the Compact Muon Solenoid (CMS) detector at the LHC. Themeasurements, performed in the electron and muon decay channels, are combinedto give $\sigma(\mathrm{pp} \rightarrow \mathrm{W}X) \times{\cal{B}}(\mathrm{W} \rightarrow \ell \nu) = 9.95\pm0.07\,{\textrm{(stat.)}}\pm0.28\,{\textrm{(syst.)}}\pm1.09\,{\textrm{(lumi.)}} \mathrm{nb}$ and$\sigma(\mathrm{pp} \rightarrow \mathrm{Z}X) \times {\cal{B}}(\mathrm{Z}\rightarrow \ell^+ \ell^-) = 0.931\pm0.026\,{\textrm{(stat.)}}\pm0.023\,{\textrm{(syst.)}}\pm0.102\,{\textrm{(lumi.)}} \mathrm{nb}$, where$\ell$ stands for either $\mathrm{e}$ or $\mu$. Theoretical predictions,calculated at the next-to-next-to-leading order (NNLO) in QCD using recentparton distribution functions (PDFs), are in agreement with the measured crosssections. Hence copious production of these well understood and cleansignatures suggest the use of W/Z as a "standard candle" for measuring theluminosity at the LHC alongside the current Van der Meer (VdM) separation scanmethod.

Measurements of Inclusive W/Z Production Cross Sections at CMS and W/Z as a Luminometer