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I have a a partial decay width in form of ## \frac{d \Gamma}{d \cos{\theta}~ dq^2} = ## some terms functions in q and ## \theta ## variables.

How to integrate this decay width in Mathematica over this two variables ?

I tried some thing like

j[q_]:= ## \int_{1}^{-1} ## Gam[q, ## \theta ##] d Cos[## \theta ##]

then

## \int_{0}^{10} ## j[q] dq^2

But it gave me errors

Cos[## \theta ##] is not a valid variable.

Integrate::ilim: Invalid integration variable or limit(s) in {q^2,0,10}. >>

I also tried to use NIntegrate..

So any help in that ?

Cheers,

S.

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# Partial decay width in Mathematica

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