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We define a Focus Point (FP) Asymmetry, $A_{\rm FP}$, obtained by integratingthe normalised transverse momentum distribution of either lepton produced inthe Drell-Yan (DY) process below and above a point where a variety of popular$Z^\prime$ models all have the same magnitude. For a given $Z^\prime$ mass theposition of this FP is predictable, depending only on the collider energy andon the low transverse momentum cut chosen in the normalisation procedure. Theresulting $A_{\rm FP}$ is very sensitive to the $Z^\prime$ width, and can beused to constrain this parameter in experimental fits.

Constraining $Z^\prime$ widths from $p_T$ measurements in Drell-Yan processes