Single-top quark measurements at ATLAS

ATLAS has performed very well in 2010 and 2011, the three standard model single-top channel were studied carefully, the t-channel was discovered at ATLAS using 165 pb^{-1} of data, and the cross section was re-measured to be 90^{32}_{-22}pb using 700 pb^{-1} of data. the Wt-channel has been studied, and upper limit at 95% C.L. on the cross-section was calculated, the limits were 158pb and 39 pb for lepton+jets and Dileption channels respectively. the single-top s-channel was also studies at ATLAS for the first time, an upper limit was calculated for its cross-section and it was 26.5 pb at 95% C.L. In addition to the SM single-top, the flavor changing neutral current through single-top quark was analysed using 35 pb^{-1} of data collected in 2010, the signal was not seen and an upper limit on the cross-section was calculated and it was 17.3 pb.