Photon and Jet Energy Reconstruction from Low to High Momenta for Future Muon Collider Studies

In addition to the Future Circular Collider, groups are working on proving the feasibility of a muon collider. This collider will have the benefit of having a smaller circumference (10km vs. 100km) and will let all the energy imparted into the particle be used in the collision. Muons decaying in the beam tube produce a radiation background, flooding the detector with particles such as photons. These particles leave tracks and energy deposits that obscure important particles resulting from μμ collision events. This study provides a baseline benchmark for future studies that add beam-included background into their simulation. The accuracy of the reconstructed energy from the incoming particle(s) can be increased by applying a correction factor based on the reconstructed polar angle and reconstructed energy. This correction factor function is broken into multiple sinusoidal functions along the polar angle axis and along the reconstructed energy axis there is an exponential decay term. Applying this correction factor to the reconstructed photons shifts the mean of a deltaE/E from 0.04317 → 0.00004732, showing an increase in energy accuracy and precision. Similarly, applying these correction factors to the reconstructed jets sees a mean shift in the deltaE/E plot from -0.378 → 0.0124 and shifts the invariant mass of the original jet producing Z' boson from 6271 GeV/c^2 → 8152 GeV/c^2, much closer to the true invariant mass of 8675 GeV/c^2.