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Adding PQMSSM_SARAH model

Jan Tuzlic Offermann requested to merge jaofferm/MadGraphModels:main into main

Adding a PQMSSM model (DFSZ axions + MSSM), which includes axions (PdgID=51), saxions (PdgID=2000051) and axinos (PdgID = 1000051). Note that the axino only appears in this model via a 5th neutralino (PdgID=1000045), which is nearly purely axino with perturbative up- and down-type Higgsino mixing.

Some details on the model can be found in this talk from PHENO 2023: https://indico.cern.ch/event/1218225/contributions/5384880/

Here is a related (and ongoing) MC production request: https://its.cern.ch/jira/browse/ATLMCPROD-10645

@brosser @fizisist

Edited by Jan Tuzlic Offermann

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