Heavy Majorana neutrino production at electron-muon colliders

Abstract

Possibilities for detecting heavy Majorana neutrinos ($N$'s) at future $e\mu$ colliders are investigated. In contrast to the $e^{-}{e}^{+}$ colliders (LEP200 and NLC), the center-of-mass (CMS) energies achieved at $e\mu$ colliders can be much higher and the $Z$-mediated $s$ channel is excluded automatically. This opens the attractive possibility of having high production cross sections for $N$'s and at the same time probing only the strength of charged current couplings of $N$'s ($NWe$ and $NW\mu$). The production cross sections and the expected numbers of events for the reaction $e^{\mp }{\mu }^{\pm }\to NN\to W^{\pm }{\ell }^{\mp }{W}^{\pm }{\ell }^{\prime \mp }$ are calculated for various masses $M$ of the Majorana neutrinos and for the CMS energies $\sqrt{s}=0.5-6.0$ TeV. The values of the charged current coupling parameters are set equal to their present upper bounds. We obtain reasonably high production cross sections. Further, the effects of the off-shell intermediate $N$'s turn out to be significant only at $\sqrt{s}\stackrel{>}{\approx }2$ TeV.

a mistake in the 2OS and 1OS programs corrected, neutrino off-shell effects are then weaker; the full (nOS) program unchanged, thus also the full cross sections and the basic conclusions unchanged; revtex, 15 pages, 6 eps-figures

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