[Rivet] how to use W/ZFinders for WZ analysis

[Frank Siegert]

Hi Roman,

Actually, I think you almost gave the answer yourself: You want to use
Rivet 1.8.x, since that contains a bug fix for W/ZFinder not dealing
correctly with the input final state argument:

http://rivet.hepforge.org/trac/changeset/3519

Let us know whether that has fixed your problem.

Cheers,
Frank

On 20 September 2012 18:03, Roman Lysak <lysak at fzu.cz> wrote:
>
>   Dear Rivet authors,
>
> I'm trying to run Rivet analysis which selects one W and one Z boson which
> both decay to electrons or muons (see the attachment).
> In the analysis, I try to use W(Z)Finder projection.
>
> There is one problem when having events where both W and Z decay to leptons
> of the same flavor (e.g. three electrons in final state): W and ZFinder can
> use the same leptons to find W/Z boson.
> Therefore, we apply the condition on W/Z leptons that they are not the same
> (see lines 95-102). However, this is not ideal thing to do, since there
> could be some events we are loosing with such condition (other leptons could
> form W bosons too).
>
> I tried to use VetoedFinalState::addVetoOnThisFinalState() (see lines 40-50)
> in order to restrict the particles WFinder can use (ZFinder uses all of the
> particles).
> However, this seem to have no effect and I still get the same numbers
> (cross-section) as before when I did not apply this veto.
> Actually, the cross-sections are quite different depending whether we use
> (or not)  our condition on leptons from W/Z not being the same (about 50%
> difference).
>
> Could you suggest what would be the best procedure to use to solve this?
>
> Thanks a lot,
>   Roman Lysak
>
> P.S. I'm using Rivet 1.7.0, but as far as I understand there is the same
> functionality for W/ZFinder in Rivet 1.8.0 just with a little bit different
> syntax.
>
>
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