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Direct Measurement of theWBoson Width

Journal article published in 2009 by V. M. Abazov, F. Abe, B. Abbott, M. G. Albrow, M. Abolins, D. Amidei, B. S. Acharya, J. Antos, M. Adams, T. Adams, C. Anway-Wiese, E. Aguilo, G. Apollinari, M. Ahsan, H. Areti and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) ; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) ; We present a direct measurement of the width of the W boson using the shape of the transverse mass distribution of W -> e nu 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.