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update DR1 for tW for MG5 3.3.1

Andrej Saibel requested to merge asaibel/athena:devMG5tWDr1_226 into main

Dear all,

this is the fix to DR1 for tWX production in MG5 2.9.9 and 3.3.1. The way the amplitudes are added in the matrix_X.f files was changed. The new regex compensates for these changes.

The production was checked with tWZ and the total cross-section was compared with the old samples from https://its.cern.ch/jira/browse/ATLMCPROD-7290

Further tests for tW production are required @dhirsch @yanght

Kind regards,

Andrej

Edited by Andrej Saibel

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