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- Thread starter melli1992
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mfb

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Yes I have, but my problem is that I have an integral over the square root of a polynomial of degree 3. I dont see it reducing to beta^4 that easily...

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mfb

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Can you post the integral you get?

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$$\int {\rm d}s_{23} \sqrt{(s^2 + m_1^4+s_{23}^2-2ss_{23}-2m_1^2s_{23}-2sm_1^2)(s_{23}-m_2^2)}$$

We have ##(m_2+m_3)^2 \leq s_{23} \leq s-m_1^2##, ##s=(p_1+p_2+p_3)^2## and ##s_{23} = (p_2 + p_3)^2##. To get to this form, we have assumed that the combined state ##p_{23}## is at rest.

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mfb

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