[Rivet] Rivet 2.4 and xsec/event counter information

[David Grellscheid]

On 09/11/15 21:47, Andy Buckley wrote:
> On 09/11/15 11:20, Leif Lönnblad wrote:
>> On 2015-11-09 10:44, David Grellscheid wrote:
>>> That's a neat idea! I assume you would do this just at the level of the
>>> HepMC converter?
>>
>> Yes. It would have to be mentioned in the specs for HepMC3 that the
>> event number should be interpreted as the number of events generated so
>> far, and that zero-weight events may be left out.
> 
> Which would require a lot of care in usage like ATLAS' generator 
> filters, where events in the HepMC are discarded before writing to disk 
> based on kinematic (etc.) selections... compatibility with that needs to 
> be considered, at least.

Won't that still work? Let's say you originally have events numbered

E 1 ...
E 452 ...
E 1642 ...

and you leave out the middle one, you still get the correct "number of
attempts" from the third event.

  David