Studies of W and Z bosons at s=7TeV with ATLAS

The contribution describes the first observation in the ATLAS experiment of W and Z bosons produced in s=7TeV collisions. Results for both electron and muon final states are presented, corresponding to an integrated luminosity ranging from 6.4 to 7.9 nb−1, depending on the specific channel. The selection yields 17 W→eν and 40 W→μν candidates, in agreement with Monte Carlo expectations.