[Rivet] Tau decays from Particle guns

[Holger Schulz]

Hi,

I am doing some tau stuff and came across a problem I do not know how to 
tackle.

When I look for taus coming from, e.g. an electron-positron collision, 
everything is fine.
However, when trying to do the same with a tau-gun, the taus themselves are
to be found in the incoming particles of a vertex and the TauFinder is 
unable to find
them. Can someone with some more experience with HepMC give me some pointers
how to do this properly? It might also be a generator issue (Sherpa in 
DECAYER mode).

Thanks,
Holger

    GenEvent: #1 ID=0 SignalProcessGenVertex Barcode: 0
      Momenutm units:     GEV     Position units:      MM
      Cross Section: 0 +/- 0
      Entries this event: 2 vertices, 5 particles.
      Beam Particles are not defined.
      RndmState(0)=
      Wgts(1)=(0,1)
      EventScale -1 [energy]      alphaQCD=-1     alphaQED=-1
                                         GenParticle Legend
             Barcode   PDG ID      ( Px,       Py,       Pz,     E )
    Stat  DecayVtx
    ________________________________________________________________________________
    GenVertex:       -1 ID:    6 (X,cT):0
      Wgts(1)=1
      I: 1     10001       15 +0.00e+00,+0.00e+00,+0.00e+00,+1.78e+00  
    2        -1
      O: 1     10002       15 +0.00e+00,+0.00e+00,+0.00e+00,+1.78e+00  
    2        -2
    Vertex:       -2 ID:    6 (X,cT)=+0.00e+00,+0.00e+00,+0.00e+00,+8.17e-02
      Wgts(1)=1
      I: 1     10002       15 +0.00e+00,+0.00e+00,+0.00e+00,+1.78e+00  
    2        -2
      O: 3     10003     -211 -4.88e-01,+1.27e-01,-1.85e-01,+5.55e-01   1
               10004      130 +1.86e-02,+3.71e-02,-2.53e-01,+5.60e-01   1
               10005       16 +4.69e-01,-1.64e-01,+4.38e-01,+6.62e-01   1


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