[Rivet] missingEt variable in WFinder constructor

[Frank Siegert]

Hi Andy,

On 2 February 2015 at 16:43, Andy Buckley <andy.buckley at cern.ch> wrote:
> Hi Ines,
>
> This must be a meaning of "simpler version" that I'm not familiar with!
> I've attached a real minimal working example ;-) The version you
> provided did not compile with the latest version of Rivet, so I guess
> you are using an old one: which version?
>
> Anyway, with my cut-down analysis I can reproduce the problem. I added a
> printout line to WFinder.cc and see that the value that we are using as
> an ET cut is much larger than the neutrino pT:
>
> Rivet.Projection.WFinder: DEBUG  W- reconstructed from:
>    (599.426; 30.861, -0.00629191, 598.631) 13
>  + (114.54; -28.4288, 0.264693, 110.956) -14
> Rivet.Projection.WFinder: DEBUG  Scalar ET = 131.66 GeV vs. required =
> 20 GeV
> Rivet.Analysis.MinimalAnalysis: INFO  pT_nu1 = 28.43 GeV
>
> This looks like a projection bug to me -- I need to look into the
> definition of the MissingMomentum projection that we're using,

Thanks for looking into it.

Is this an event with only one neutrino where it's obvious that/where
something is going wrong?

> but
> surely missing ET needs to be a vector rather than scalar quantity. This
> is even suggested in the code comments:
>
>     /// @todo Restrict missing momentum eta range? Use vectorET()?
>
> Frank, should I change this:
>
>     if (vismom.scalarEt() < _etMiss) {
>
> to use vectorEt instead?

I'm afraid you'll have to ask Andy whether he's happy with such a change ;-)
https://rivet.hepforge.org/trac/changeset/e7fba2de73c390c478d94c0c4849bd9cd543d332
But it sounds fine to me.

Cheers,
Frank