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TriangleSingularity

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A simple package that calculates triangle loop using the Feynman approach, reduced to a single integral.

Evaluation of amplitude

triangleloop(m1², m2², m3², M1², M2², M3²)

Position of singularities

M3² = Polynomial([0im, 1.0])
P = landau_determinant(m1², m2², m3², M1², M2², M3²)
roots(P)

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Calculation of triangle loop diagram and application to physical cases

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