Overview of Standard Model physics at ATLAS

The ATLAS collaboration has carried out a large set of measurements of Standard Model processes at 7 and 8 TeV centre of mass energies of p-p collisions, covering soft QCD and hard jet and photon production processes together with W, Z and multi-boson processes. ATLAS has measured the total p-p cross section at the LHC at 7 TeV in a special LHC run with high beta* beam optics. The elastic scattering process is measured as a function of the momentum transfer t, which when extrapolated to t=0 gives the total cross section from the optical theorem. Differential measurements of inclusive, di- and tri-jet production provide stringent tests of high-order QCD predictions and provide input for determination of parton density functions. Measurements of isolated inclusive and di-photons cross sections for energetic photons test various theoretical predictions and constrain parton density functions. The nucleon strange density plays an important role for a number of physics processes, including the formation of strange matter and neutrino interactions at ultrahigh energies. The precision measurements of inclusive W and Z production as well as the production of W bosons in association with a charm quark provide new constraints on the strange density in the proton. ATLAS measurements of multi-boson production processes involving combinations of W, Z and isolated photons are summarized. The measurements are performed using leptonic decay modes, as well as semileptonic channels. Differential and total cross sections are presented and are used to place constraints on anomalous triple-gauge boson couplings. The productions of multi-bosons in association with two forward jets at LHC are sensitive to quartic couplings between gauge bosons. The latest results of cross section measurements of multi-bosons and limits on anomalous quartic couplings (aQGC) at 8 TeV as well as future prospects are presented.