# Determination of the width of the top quark

Abstract : 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'| < 0.63 at 95% C.L.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00522253
Contributor : Swarna Bassava <>
Submitted on : Thursday, September 30, 2010 - 11:46:03 AM
Last modification on : Friday, September 10, 2021 - 1:50:07 PM

### Citation

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, et al.. Determination of the width of the top quark. Physical Review Letters, American Physical Society, 2011, 106, pp.022001. ⟨10.1103/PhysRevLett.106.022001⟩. ⟨in2p3-00522253⟩

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