[Rivet] DISLepton Class fails to find outgoing lepton

[Andy Buckley]

Hi Marian,

Thanks for the report. I've CC'd Andrii, who provided that updated
DISLepton logic. Andrii, can you comment on how we can fix this
behaviour in a generator-independent way?

Andy


On 10 November 2017 at 16:32, Marian Heil <marian.heil at durham.ac.uk> wrote:
> Dear rivet authors,
>
> I think I found a bug in the DISLepton class in rivet version 2.5.4: It does
> not find the outgoing lepton for a DIS scattering generated with Sherpa (the
> corresponding HepMC file is attached).
>
> As far as I understand it in DISLepton::project the iteration over all
> vertices and fails on the vertex "-6", because there are two outgoing
> leptons ("10009" and "10015"). The first electron loops over vertex "-5"
> back into vertex "-6" (for what ever reason), so it is not an actual final
> state particle. The old code from version 2.5.3 does actually work for the
> event.
>
> Cheers,
> Marian
>
>
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-- 
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow