  Measurement of cosmic microwave background polarization is today a major goal
of observational cosmology. The level of the signal to measure, however, makes
it very sensitive to various systematic effects. In the case of Planck, which
measures polarization by combining data from various detectors, the beam
asymmetry can induce a temperature leakage or a polarization mode mixing. In
this paper, we investigate this effect using realistic simulated beams and
propose a first-order method to correct the polarization power spectra for the
induced systematic effect.
