Excited Neutrino Search Potential of the FCC-Based Electron-Hadron Colliders

The production potential of the excited neutrinos at the FCC-based electron-hadron colliders, namely, the ERL60 circle times FCC with root s = 3.46 TeV, the ILC circle times FCC with root s = 10TeV, and the PWFA-LC circle times FCC with root s = 31.6 TeV, has been analyzed. The branching ratios of the excited neutrinos have been calculated for the different decay channels and shown that the dominant channel is nu* -> eW(+). We have calculated the production cross sections with the process of eP -> nu*q -> eW(+)q and the decay widths of the excited neutrinos with the process of nu* -> eW(+). The signals and corresponding backgrounds are studied in detail to obtain accessible mass limits. It is shown that the discovery limits obtained on the mass of the excited neutrino are 2452 GeV for L-int = 100 fb(-1), 5635 GeV for L-int = 10fb(-1) (6460 GeV for L-int = 100 fb(-1)), and 10200 GeV for L-int = 1 fb(-1) (13960 GeV for L-int = 10 fb(-1)), for the center-of-mass energies of 3.46, 10, and 31.6 TeV, respectively.