  The amount of baryon asymmetry generated by the electroweak strings at a
rough estimate is smaller than that generated by the bubble expansion since the
collapsing strings cannot cover the whole volume of the universe. However, the
interaction cross section of the strings with particles can be larger than the
geometrical area of the order of the string thickness. The scattering cross
section of quarks from the electroweak strings is calculated using Dirac
equation in the string background. It it proportional to the reverse of the
momentum perpendicular to the string axis. Thus the effective interaction area
can be enhanced at least ten times so that the suppression compared to the
first order phase transition scenario might be also improved.
