Abstract
We investigate a neural network-based hypothesis test to distinguish different $W'$ and charged scalar resonances through the $\ell+\require{cancel}\cancel{E}_T$ channel at hadron colliders. This is traditionally challenging due to a four-fold ambiguity at proton-proton colliders, such as the Large Hadron Collider. Of the neural network approaches we studied, we find a multi-class classifier based on a fully-connected neural network trained upon 2D histograms made from kinematic variables of the final state $\ell$ to be the most powerful. Furthermore, by considering the 1-jet processes, we demonstrate that one can generalize to multiple $2D$ histograms to represent different variable pairs. Finally, as a comparison to traditional approaches, we compare our method with Bayesian hypothesis testing and discuss the pros and cons of each approach. The neural network scheme presented in this paper is a powerful tool that can help probe the properties of charged resonances.
Highlights
Ever since the discovery of the W boson through the eν decay channel in 1983 at the SPS collider [1,2], the search for W0 and other charged boson resonances has continued
We mainly focus on Fully connected neural network upon histograms (FNNh) since it gives the best performance
We have investigated the ability of using deep neural networks to distinguish different resonances in the pp → W0=H → lνl process at the HL-Large Hadron Collider (LHC)
Summary
Ever since the discovery of the W boson through the eν decay channel in 1983 at the SPS collider [1,2], the search for W0 and other charged boson resonances has continued. Some of the most important properties to be identified of a W0 would be the mass, decay width, and couplings to the Standard Model (SM) fermions; if we further include the study of charged scalar bosons, spin would be important. The longitudinal momentum can be solved from a quadratic equation assuming that the mediating boson is on-shell, but there is no event-by-event information that can be used to determine which of the two quadratic solutions is correct This ambiguity has already been pointed out in several studies involving =ET, such as the reconstruction of W → eν at the SPS pp Collider [1] and top-pair production at the Tevatron [14]. More technical details of our investigations are provided in the Appendix
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