ATLAS sensitivity to Wtb anomalous couplings in top quark decays

We study the sensitivity of the ATLAS experiment to Wtb anomalous couplings in top pair production with semileptonic decay, t -> W+ b, tbar -> W- bbar with one of the W bosons decaying leptonically and the other hadronically. Several observables are examined, finding that a convenient choice can significantly reduce systematic uncertainties and improve limits on anomalous couplings by a factor of 1.3-1.7. Combining the most sensitive observables, the precision achieved in the determination of Wtb anomalous couplings is of a few percent in the semileptonic channel alone.

p p: inclusive reaction
quark: pair production
top
top: decay
W: coupling
vertex function: (top W bottom)
W: leptonic decay
W: hadronic decay
transverse momentum: spectrum
mass spectrum

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