[Rivet] [Rivet-svn] r2240 - trunk/src/Analyses

[Andy Buckley]

On 08/02/10 16:53, Frank Siegert wrote:
> Holger Schulz, Wednesday 03 February 2010:
>> Andy Buckley wrote:
>>> On 03/02/10 18:18, blackhole at projects.hepforge.org wrote:
>>>> Author: holsch Date: Wed Feb  3 18:18:56 2010 New Revision: 2240
>>>>
>>>> Log: Iterate over charged particles of the lossy final state
>>>> directly instead of iterating over jets and the particles they are
>>>> made of. This is to fix the discrepancy observed in the dN vs.
>>>> dDeltaPhi plots. A low statistics example can be found here:
>>>> http://users.hepforge.org/~holsch/Rivet/CDF_2001_S4751469_d01-x01-y0
>>>> 1.pdf
>>>
>>> It's low stats, but it looks good: can you run a higher stats example
>>> just to make sure? Thanks ;)
>>>
>>> Andy
>>
>> Done:
>>
>>    
>>  http://users.hepforge.org/~holsch/Rivet/Validation/CDF_2001_S475xxxx/plots.html
> 
> Hmmm, still doesn't look very consistent, does it? Any other ideas?

Hmm, it's improved the overall fit quite a lot, but the very small
Delta(phi) region still disagrees. I'm not *sure* this is inconsistent,
since the region in the profile plots is so much wider than the region
in which the discrepancy is visible, but then for the pTsum measure in
particular the profile plot agreement in the toward region is so good
that I would tend to agree that this discrepancy should show up.

I've looked through the code (yet) again and now everything gets filled
inside the same loop over tracks: there's nowhere obvious for this to go
wrong. So maybe something is wrong in the way that the profiles are
filled from the output of the track loop -- but that looks okay to me
and I would expect if something were wrong here then it would show up
across the histogram.

I'm a bit puzzled, but also not 100% convinced that this is actually a
discrepancy...

Andy

-- 
Dr Andy Buckley
SUPA Advanced Research Fellow
Particle Physics Experiment Group, University of Edinburgh