LAUSR

We define a focus point (FP) asymmetry, ${A}_{\mathrm{FP}}$, obtained by integrating the normalized transverse momentum distribution of either lepton produced in the Drell-Yan (DY) process below and above a point where a variety of popular ${Z}^{\ensuremath{'}}$ models all have the same magnitude. For a given ${Z}^{\ensuremath{'}}$ mass the position of this FP is predictable, depending only on the collider energy and on the low transverse momentum cut chosen in the normalization procedure. The resulting ${A}_{\mathrm{FP}}$ is very sensitive to the ${Z}^{\ensuremath{'}}$ width and can be used to constrain this parameter in experimental fits.