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Simplified models provide an avenue for characterising and exploring NewPhysics for large classes of UV theories. In this article we study the abilityof the LHC to probe the spin and parity quantum numbers of a new lightresonance $X$ which couples predominantly to the third generation quarks in avariety of simplified models through the $t\bar t X$ channel. After evaluatingthe LHC discovery potential for $X$, we suggest several kinematic variablessensitive to the spin and CP properties of the new resonance. We show how ananalysis exploiting differential distributions in the semi-leptonic channel candiscriminate among various possibilities. We find that the potential todiscriminate a scalar from a pseudoscalar or (axial) vector to be particularlypromising.

Determining the Quantum Numbers of Simplified Models in $t\bar{t}X$ production at the LHC