Speaker
Description
Reconstructing dileptonic $t\bar{t}$ events remains a long-standing challenge due to the presence of two undetectable neutrinos. Many techniques still in use today have seen little change over the past three decades. This poster gives an overview of the reconstruction algorithms currently used by the ATLAS experiment: Neutrino Weighting, Sonneschein and Ellipse Method, and a novel implementation of the neutrino weighting technique that achieves a significant improvement in computational performance, while having comparable reconstruction accuracy. We consider how these methods are currently used in top physics measurements such as charge asymmetry, top yukawa measurement, W polarisation and EFT measurements at the LHC and then impact these methods could have at HL-LHC.