# Calchep as matrix element generator

Asked by
Safinaz

Hi authors,

May I ask when I use :

In[1]:= <<"../sum_22.m"

In[2]:= <<"symb1.m"

In[3]:= sum

the Mandelstam variables in the expression I get are in parton or Hadron level ? I mean for s variable

for example: s = x1 x2 E^2_CME or s = E^2_CME (14000^2, LHC) ..

Also after using sum_int.m program, it's made an integration to get the total cross section, so

how I substitute " be$ " symbol and " s "variable I get now in the yielded formula ..

Thanks,

Safinaz

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