Radiative production of sneutrinos ine+e−annihilation with polarized beams

We give for the process ${\mathit{e}}^{+}$+${\mathit{e}}^{\mathrm{-}}$→ν̃+ν̃¯+γ of radiative sneutrino production with polarized beams the complete analytic expression for the transition amplitude. For beam energies between 100 and 500 GeV the total cross section, the photon energy spectrum, and photon angular distribution as well as the respective longitudinal polarization asymmetries are computed in representative gaugino-Higgsino mixing scenarios with the sneutrino decaying only into the lightest neutralino. Comparing the results with those for the competing standard process of radiative neutrino production we show that with the expected luminosity for a 500-GeV ${\mathit{e}}^{+}$ ${\mathit{e}}^{\mathrm{-}}$ collider it would be difficult to identify a sneutrino lighter than both the chargino and the second lightest neutralino. The use of longitudinally polarized beams especially would not facilitate identification of the sneutrino in this mass region.