snorer.KallenLambda

snorer.KallenLambda(x,y,z)

Källen lambda function $$ \lambda(x,y,z)=x^2+y^2+z^2-2(xy+yz+zx), $$ a useful function for evaluating kinetical quantities in particle physics.

Parameters:

x : array_like

y : array_like

z : array_like

Returns:

out : scalar/ndarray
    out is scalar if all inputs are scalars.

References

  1. V. Ilisie, Concepts in quantum field theory: A practitioner's toolkit, Springer (2016)