## Measurement of B(t$\to$Wb)/B(t$\to$Wq) at $\sqrt(s)$ = 1.96 TeV

### Abstract

7 pages, 1 figure - D0We present the measurement of R = B(t->Wb)/B(t->Wq) in ppbar collisions at sqrt(s) = 1.96 TeV, using 230 pb-1 of data collected by the DO experiment at the Fermilab Tevatron Collider. We fit simultaneously R and the number of selected top quark pairs (ttbar), to the number of identified b-quark jets in events with one electron or one muon, three or more jets, and high transverse energy imbalance. To improve sensitivity, kinematical properties of events with no identified b-quark jets are included in the fit. We measure R = 1.03 +0.19 -0.17 (stat+syst), in good agreement with the standard model. We set lower limits of R > 0.61 and |V_tb| > 0.78 at 95% confidence level

Topics: 12.15.Hh; 14.65.Ha, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Publisher: 'Elsevier BV'
Year: 2006
DOI identifier: 10.1016/j.physletb.2006.07.019
OAI identifier: oai:HAL:in2p3-00025745v1