Excited neutrino search potential of the FCC-based electron-hadron colliders

Abstract

The production potential of the excited neutrinos at the FCC-based electron-hadron colliders, namely the ERL60$\otimes$FCC with $\sqrt{s}=3.46$ TeV, the ILC$\otimes$FCC with $\sqrt{s}=10$ TeV, and the PWFA-LC$\otimes$FCC with $\sqrt{s}=31.6$ 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 ${\nu }^{\star }\to e{W}^{+}$. We have calculated the production cross sections with the process of $ep\to {\nu }^{\star }q\to e{W}^{+}q$ and the decay widths of the excited neutrinos with the process of ${\nu }^{\star }\to e{W}^{+}$. 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 $L_{int}=100$ $f{b}^{-1}$, $5635$ GeV for $L_{int}=10$ $f{b}^{-1}$ ($6460$ GeV for $L_{int}=100$ $f{b}^{-1}$), and $10200$ GeV for $L_{int}=1$ $f{b}^{-1}$ ($13960$ GeV for $L_{int}=10$ $f{b}^{-1}$), for the center-of-mass energies of $3.46$, $10$, and $31.6$ TeV, respectively.

Comments: 16 pages, 9 figures, 5 tables