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Determination of the width of the top quark

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  • D0 Collaboration
Article number022001
<mark>Journal publication date</mark>11/01/2011
<mark>Journal</mark>Physical review letters
Issue number2
Number of pages7
Publication StatusPublished
<mark>Original language</mark>English


We extract the total width of the top quark, Gamma_t, from the partial decay width Gamma(t -> W b) measured using the t-channel cross section for single top quark production and from the branching fraction B(t -> W b) measured in ttbar events using up to 2.3 fb^-1 of integrated luminosity collected by the D0 Collaboration at the Tevatron ppbar Collider. The result is Gamma_t = 1.99 +0.69 -0.55 GeV, which translates to a top-quark lifetime of tau_t = (3.3 +1.3 -0.9) x 10^-25 s. Assuming a high mass fourth generation b' quark and unitarity of the four-generation quark-mixing matrix, we set the first upper limit on |Vtb'|

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© 2011 The American Physical Society