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We recognise the appearance of a Focus Point (FP) in the transverse momentumdistribution of either leptons originating from a BSM $Z^\prime$-boson decay,after a simple normalisation procedure. Exploring the properties of the FP wewill be able to define in a general way a new observable, the Focus PointAsymmetry ($A_{\rm FP}$), which can be used to set constrains on the $Z^\prime$width. We discuss the potential and the sensitivity of the $A_{\rm FP}$ in asdiagnostic tool for $Z^\prime$ physics, considering various $Z^\prime$phenomenological realisations.

Using leptons $p_T$ measurements to constrain $Z^\prime$-bosons widths in Drell-Yan processes at the LHC