[Rivet] Raghav & Holger WFinder "issues"

[Andy Buckley]

Hi Riveters,

Can someone please look into Raghav's code re. the apparent WFinder 
misbehaviour? I'm completely swamped at the moment, and won't have 
capacity for quite a while... and he deserves a reply.

In case it's relevant, Holger and I looked again at his partonic event, 
and the problem there is (apparently) that the final state momentum is 
highly unbalanced (even transverse), so the visible momentum does not 
balance the invisible at all. I don't see how we can possibly operate 
with events like that, so it needs to be debugged upstream. Maybe 
Raghav's events suffer from some similar issue?

To be clear: we are *not* going to introduce a global "is partonic" flag 
into Rivet, with potentially all behaviours changing as a result... that 
way madness lies! We should be able to handle partons with sensible 
HepMC-compatible status codes and kinematic frames without needing to 
treat them specially.

Andy

-- 
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow