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We propose that, within the standard model, the correlation between the$t\bar{t}$ forward--backward asymmetry $A_{t\bar t}$ and the correspondinglepton-based asymmetry $A_l$ -- at the differential level -- is strong andrather clean both theoretically and experimentally. Hence a combinedmeasurement of the two distributions as a function of the lepton $p_T$, adirect and experimentally clean observable, would lead to a potentiallyunbiased and normalization-free test of the standard model prediction. To checkthe robustness of our proposal we study how the correlation is affected bymis-measurement of the $t\bar t$ system transverse momenta, acceptance cuts,scale dependence and compare the results of MCFM, POWHEG (with & without PYTHIAshowering), and SHERPA's CSSHOWER in first-emission mode. We find that theshape of the relative differential distribution $A_{l} (p^{l}_{T})[A_{t\bar{t}} (p^l_T)]$ is only moderately distorted hence supporting theusefulness of our proposal. Beyond the first emission, we find that thecorrelation is not accurately captured by lowest-order treatment. We alsobriefly consider other differential variables such as the system transversemass and the canonical $t\bar t$ invariant mass. Finally, we study new physicsscenarios where the correlation is significantly distorted and therefore can bemore readily constrained or discovered using our method.

Data driving the top quark forward--backward asymmetry with a lepton-based handle