[Rivet] Rivet: Accessing intermediate particles

[David Hall]

On Sat 30 Jun 2012 20:24:05 CEST, Hendrik Hoeth wrote:
> Hi David,
>
> Thus spake David Hall (David.Hall at physics.ox.ac.uk):
>
>> When I look at the parents of the electrons, it just gives me the
>> incoming protons. It does this for >=2 electrons, so not just for
>> electrons from the hard scatter. So it seems I can't differentiate
>> between electrons this way.
>
> Are you using HepMC_Short or HEPMC2_SHORT_OUTPUT or USE_HEPMC_SHORT?
>
> What's your process (W -> e nu and Z/gamma -> e e gives you three
> electrons, all in the hard process)?

I'm not using the SHORT output option as I thought this issue might 
occur if I did. Also, I'm using 13 -14 11 -11 so the W is decaying 
muonically.

>
>> I agree that in an ideal world we can just treat everything exactly
>> as we would in data. Unfortunately, due to time constraints and
>> deadlines we often need a quick way to do things, so we need to be
>> able to do truth-level studies like this relatively quickly.
>
> Good thing is: Usually it's also possible to publish following results,
> not just following the calendar. Might take some balls, but certainly
> possible, and makes for better publications. And yes, I've been in the
> experimental mill, too.

Ha, believe me, if I had the choice this is how I would do it. But as a 
simple student in the ATLAS collaboration I have no choice as to the 
timescales involved, or the quality of the publications released.

>
> Cheers,
>
>     Hendrik
>

Cheers,
David