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In this article, we compute the two observables, impulse and waveform, in ablack hole scattering event for the Scalar-Tensor theory of gravity with ageneric scalar potential using the techniques of Worldline Quantum FieldTheory. We mainly investigate the corrections to the above mentionedobservables due to the extra scalar degree of freedom. For the computation ofimpulse, we consider the most general scenario by making the scalar fieldmassive and then show that each computed diagram has a smooth massless limit.We compute the waveform for scalar and graviton up to 2PM, taking the scalar asmassless. Furthermore, we discuss if the scalar has mass and how the radiationintegrals get more involved than the massless case. We also arrive at someanalytical results using stationary phase approximation. Interestingly, we alsoshow that the $\lambda_4 \varphi^4$ interaction vertex does not contribute tothe radiation by showing that the integral has no non-zero finite value.

Observables from classical black hole scattering in Scalar-Tensor theory of gravity from worldline quantum field theory