[Rivet] missingEt variable in WFinder constructor

[Andy Buckley]

[Oops, I thought this was sent _many_ hours ago...]

On 02/02/15 15:49, Frank Siegert wrote:
> 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

Ha! I'll run a few checks and ask myself ;-)

> But it sounds fine to me.

Cool, thanks.

Ines, this *really* means that you'll want to update to the next Rivet
version! Which should probably happen fairly soon.

Andy

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