Direct Measurement of the\u3ci\u3e W \u3c/i\u3eBoson Width

We present a direct measurement of the width of the W boson using the shape of the transverse mass distribution of W → ev candidate events. Data from approximately 1 fb-1 of integrated luminosity recorded at √s = 1.96 TeV by the D0 detector at the Fermilab Tevatron pp collider are analyzed. We use the same methods and data sample that were used for our recently published W boson mass measurement, except for the modeling of the recoil, which is done with a new method based on a recoil library. Our result, 2.028 ± 0.072 GeV, is in agreement with the predictions of the standard model