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- I encounter a function that I don‘t know in the calculation of Relativistically invariant 2-body phase space integral

I encounter a function that I don‘t know in the calculation of Relativistically invariant 2-body phase space integral:

in this equation, ##s##is the square of total energy of the system in the center-of-mass frame(I think)

I don't know what the function ##\lambda^{\frac{1}{2}}## is.

There are more equations involving this function:

I just want to know if anyone knows which textbook these equations come from, or what the function ##\lambda^{\frac{1}{2}}## is.

in this equation, ##s##is the square of total energy of the system in the center-of-mass frame(I think)

I don't know what the function ##\lambda^{\frac{1}{2}}## is.

There are more equations involving this function:

I just want to know if anyone knows which textbook these equations come from, or what the function ##\lambda^{\frac{1}{2}}## is.

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