Constraining the generic spin-two model through diphoton and dijet final states

Abstract

The highly successful theory of the Standard Model of particle physics provides a framework for three of the four fundamental forces. While there are various Beyond Standard Model theories proposing a force carrier for gravity called the graviton, it is widely accepted that if that particle exists, it must have a spin-two. Das et al. created a generic spin-two model and implemented it in a model file. Using the process pp → Y₂ + jj, Y₂ → γγ, we scan the parameter space of the model, specifically the mass of the spin-two particle, Y₂, and the effective field theory scale, Λ. We use MadGraph5_aMC@NLO for event generation, Pythia 8.312 for parton showering and hadronization, and CheckMATE2 to recast existing experimental results to this model and determine the allowed, excluded, and ambiguous parameter combinations. It was found that existing searches are sensitive to the spin-two model up until Y₂ mass of 10500 GeV. Moreover, we determined three dominant signal regions at different Y₂ mass intervals. They are 2g4j, SRaaWL, and SRaaSL. The first signal region is from atlas_1807_07447 while the next two are from atlas_1802_03158. The cut flows and rationale from these signal regions can be utilized to create a dedicated spin-two signal analysis in the future.