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We exploit offshell regions in the process $e^+e^-\rightarrow W^+W^-b\bar{b}$to gain access to the top-quark width. Working at next-to-leading order in QCDwe show that carefully selected ratios of offshell regions to onshell regionsin the reconstructed top and antitop invariant mass spectra are,\emph{independently} of the coupling $g_{tbW}$, sensitive to the top-quarkwidth. We explore this approach for different centre of mass energies andinitial-state beam polarisations at $e^+e^-$ colliders and briefly comment onthe applicability of this method for a measurement of the top-quark width atthe LHC.

Probing the top-quark width through ratios of resonance contributions of $e^+e^-\rightarrow W^+W^-b\bar{b}$