python standalone amplitude problem
Dear MG5 team,
I've found a strange behaviour when using the standalone amplitude of e-e+ > mu-mu+ process in Python.
After obtaining the amplitude for the e-e+ > mu-mu+ process as described in https:/
When evaluating the amplitude at the point
P = array([[ 499.514114491133, 499.982026313655, 499.957364866249, 499.538775938538],
[ 0.007065503628, -0.007065503628, 52.232295778412, -52.232295778412],
[ -0.093451344218, -0.093451344218, 99.631323373714, -99.81822606215 ],
[ 499.514114491133, -499.982026313655, -487.137313442112, 486.66940161959 ]])
using "allmatrix2py.
array([[ 499.5141144911327, 499.9820263136546, 499.9573648662495, 499.5387759385378],
[ 0.007065503628 , -0.007065503628 , 52.2322957784124, -52.2322957784124],
[ -0.0934513442182, -0.0934513442182, 99.6313233737138, -99.8182260621502],
[ 499.5141144911327, -499.9820263136545, -487.1373134421117, 486.66940161958
the value I obtained from MadGraph is 554921.7948358674
This makes no sense to me since both points are exactly the same, just with different precision.
I have tried the latest version (3.4.1) and the result is the same. Is this a known problem? Is there a way to avoid it?
Thank you
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- rbalgc
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