In the present paper it was shown that the critical value of the Coulomb pseudopotential (
![Click to view the MathML source](http://www.sciencedirect.com/cache/MiamiImageURL/B6TVW-4PX7B7B-3-5V/0?wchp=dGLzVzz-zSkzS)
) for MgB
2 is 0.03578; the calculated value of
![Click to view the MathML source](http://www.sciencedirect.com/cache/MiamiImageURL/B6TVW-4PX7B7B-3-Y/0?wchp=dGLzVzz-zSkzS)
essentially differs from the value given by G.A. Ummarino et al. [G.A. Ummarino, R.S. Gonnelli, S. Massidda, A. Bianconi, Physica C 407 (2004) 121]. Assuming
![Click to view the MathML source](http://www.sciencedirect.com/cache/MiamiImageURL/B6TVW-4PX7B7B-3-78/0?wchp=dGLzVzz-zSkzS)
, for the selected values of temperature, the order parameters for
σ and
π band (
Δσ and
Δπ) as well as the wave function renormalization factors (
Zσ and
Zπ) were calculated. The ratios
![Click to view the MathML source](http://www.sciencedirect.com/cache/MiamiImageURL/B6TVW-4PX7B7B-3-3B/0?wchp=dGLzVzz-zSkzS)
were estimated, where
a is the band index and
TC is a value of the critical temperature. Values of
Rσ=4.24 and
Rπ=1.54 were obtained. In the present work a total normalized density of states function was also calculated. In the last step the values of the wave function renormalization factors that define effective mass of electrons from the
σ and
π band were estimated for
TC;
[Zσ]ω=0=2.32 and
a2050dde2c21c06e45075c" title="Click to view the MathML source">[Zπ]ω=0=1.63. Obtained results were compared with experimental data and with the other theoretical predictions.