Hi Rooters, an issue of interfacing to the existing FORTRAN packages (esp. MC generators) comes up again and again and I believe we need a policy on it. In particular, there is a (well-known to many of us) FORTRAN common-block /HEPEVT/ which gives kind of "standard" interface to MC event generators. However the one described in ROOT's Hepevt.h is dimensioned to 2000 whereas all (or almost all) the last versions of event generators have it dimensioned to 4000 - we move to higher energies... The definition in Hepevt.h is all right for Pythia 5.7, however it is inconsistent with HERWIG and Pythia 6.1. This inconsistency is fatal for the mixed-language code (at least on SGI/IRIX6). One of the possible solutions would be to change the dimensions of all the arrays in Hepevt.h to 4000, however in this case it will become incompatible (I'm afraid) the old (like Pythia 5.7) versions of the event generators. Another possibility would be not to distribute libEG by default, but to build it locally instead (with the proper dimensioned /HEPEVT/) There also could be other solutions and I believe that this issue deserves discussion. - Any opinions ? - regards, pasha.
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