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Integrate Bug

I am trying to calculate this integral that should be positive.But the
answer is 0.

In: Integrate[(1)/(z^2 + b^2 + a^2 - 2 z b Sin[\[Theta]] -
    2 a b Cos[\[Theta]])^(1/2), {\[Theta], 0, 2 \[Pi]},
 Assumptions -> {a > 0, b > 0, z > 0}]


Anybody have notice a situation like that?

My platform is MacOSX 10.4 and Mathematica 7.

Best wishes,

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