Caliskan, A.

If a linear electron accelerator is installed into the SPPC (Super Proton–Proton Collider) complex, ep collision options will be available in addition to pp collisions. We consider the production of excited electrons with spin-1/2 at the future SPPC-based electron–proton colliders with center-of-mass energies of 8.44, 11.66, 26.68, and 36.88 TeV. In the ep → e*X → eγX signal process, excited electrons are produced by contact interactions and decay into the photon channel by gauge interactions. Taking into account the corresponding background process, the pseudorapidity and transverse momentum distributions of the final-state particles are plotted. We reported on the discovery, observation, and exclusion mass limits of excited electrons by applying appropriate kinematical cuts best suited for amplifying the signal of the excited electron signature. We also investigated the highest achievable values of the compositeness scale for the discovery of excited electrons at these colliders.

Caliskan, A.

We have investigated the production potential of the spin-1/2 excited muons, predicted by preonic models, at the four SPPC (Super Proton-Proton Collider)-based muon-proton colliders in different center-of-mass energies. For the signal process µp → µ*X → µγX, the production cross section and the decay width values of the excited muons have been calculated. The pseudorapidity and transverse momentum distributions of muons and photons in the final state have been obtained in order to choose the kinematical cuts best suited for enhancing the statistical signal of the excited muon signature. By applying these cuts, we report the discovery, observation and exclusion mass limits of the excited muons for two compositeness scale values, which are an energy level at which new interactions are expected to occur. It is shown that the discovery limits on the excited muons in the case the compositeness scale equals 100 TeV are 2.7, 3.9, 3.1 and 6.7 TeV for center-of-mass energies of 10.3, 14.2, 14.6 and 20.2 TeV, respectively.