Speaker
Description
New $Z^{\prime}$ gauge bosons arise in many extensions of the Standard Model and predict resonances in the dilepton invariant mass spectrum. We present ZPEED ($Z^{\prime}$ Exclusions from Experimental Data), an open-source code providing fast likelihoods and exclusion bounds for general $Z^{\prime}$ models based on the most recently published 139 fb$^{-1}$ ATLAS dilepton data. PDF and detector effects as well as higher-order corrections are effectively implemented by tabulated functions enabling a fast computation of various test statistics. Moreover, interference effects with the Standard Model Drell-Yan background can be added to the signal cross section in the analysis, which can strengthen constraints on model parameters substantially. For generic $Z^{\prime}$ models, upper bounds on the couplings can improve by up to a factor of 1.5. In simplified dark matter models, in which the dark matter contributes to the decay width of the $Z^{\prime}$, the sensitivity of dilepton resonance searches on the mediator mass can be increased by 40%.
