Implications of ν̄ee−→W−γ for high-energy ν̄e observation

Absorption of high-energy ν̄e over electrons above the W boson production threshold is reexamined. It is pointed out that, in the case of photon emission along the direction of incident high-energy ν̄e, the kinematically allowed average energy carried by the final state hard photon can be ⩽1% of the incident ν̄e energy. The differential energy spectrum for the final state hard photon is calculated. We also discuss some implications of our results for the prospective search of high-energy ν̄e.