Date of this Version
PHYSICAL REVIEW LETTERS 107, 241803 (2011); DOI: 10.1103/PhysRevLett.107.241803
We measure the cross section and the difference in rapidities between photons and charged leptons for inclusive W(→ lv) + y production in ey and µy final states. Using data corresponding to an integrated luminosity of 4.2 fb-1 collected with the D0 detector at the Fermilab Tevatron Collider, the measured cross section times branching fraction for the process pp̅ → Wy + X → lvy + X and the distribution of the charge-signed photon-lepton rapidity difference are found to be in agreement with the standard model. These results provide the most stringent limits on anomalous WW couplings for data from hadron colliders: -0.4 < ∆ky < 0.4 and -0.08 < λy < 0.07 at the 95% C.L.