Changes between Version 1 and Version 2 of FAQ-General-14


Ignore:
Timestamp:
Sep 14, 2012, 12:13:34 AM (12 years ago)
Author:
Olivier Mattelaer
Comment:

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  • FAQ-General-14

    v1 v2  
    1 ===I have zero result Why? ===
     1= I have zero result Why?=
    22
    3 Typical reasons are the following:
     3== Typical reasons ==
    441. A massive s-channel particle has a width set to zero.
    552. The pdf are zero for at least one of the initial state particles.
    … …  
    88
    99Please take a look at your Cards (param_card/ run_card)
     10
     11== More particular reason ==
     12
     13In presence of 4 point interactions and if you have diagram with 3 point interaction but that the coupling are such that all 3 point interaction are zero,
     14MG can fail to integrate the 4 point interactions. We advice you to use a restricted model whithout those superfluous 3 point interactions
     15and MG will integrate correctly the 4 point interaction diagram.