[Rivet] bug in ATLAS_2014_I1325553 (inclusive jets)

[Holger Schulz]

On 21/05/15 22:06, Christian Gütschow wrote:
> That is the normalisation factor ( = cross section / sum of weights), 
> i.e.
>
> AMI xsec = 2.9675E+07 * 1000.
> SumOfWeights = 1.5358320748e+19
> --> scale factor = 1.9321773836416558e-09
>
> which I calculated manually at the time, without using the finalise 
> method.
>
That makes sense. I wonder nothing really has changed in the code since 
then.

Peter, would you be able to run H++ with an earlier version of rivet to
see if there is the same discrepancy or not?

Holger


> Cheers,
> Chris
>
> On 21 May 2015 at 21:58, Holger Schulz <hschulz at physik.hu-berlin.de 
> <mailto:hschulz at physik.hu-berlin.de>> wrote:
>
>     Hmm, there is a scale attribute in the source files of the plots:
>
>     E.g. in
>     http://cgutscho.web.cern.ch/cgutscho/ATLAS_2014_I1325553/d01-x01-y02.dat:
>
>     # BEGIN HISTOGRAM /Users/geon/Documents/rivetArea/stdm2013_11_inclusiveJets/mc.yoda/ATLAS_2014_I1325553/d01-x01-y02
>     LineColor={[HTML]{EE3311}}
>     LineStyle=solid
>     Path=/Users/geon/Documents/rivetArea/stdm2013_11_inclusiveJets/mc.yoda/ATLAS_2014_I1325553/d01-x01-y02
>     *Scale*=1.9321773836416558e-09
>     Title=MC
>     XLabel=
>     YLabel=
>
>
>     Can you find out what that Scale thing was for/from?
>
>     Thanks,
>     Holger
>
>
>
>     On 21/05/15 21:53, Christian Gütschow wrote:
>>     Yep, they live here:
>>
>>     http://cgutscho.web.cern.ch/cgutscho/ATLAS_2014_I1325553/
>>
>>     Cheers,
>>     Chris
>>
>>
>>     On 21 May 2015 at 21:11, Holger Schulz
>>     <hschulz at physik.hu-berlin.de
>>     <mailto:hschulz at physik.hu-berlin.de>> wrote:
>>
>>         Christian,
>>
>>         do you think you can still find the validation plots from
>>         back then?
>>
>>         Holger
>>
>>
>>         On 21/05/15 20:20, RICHARDSON P. wrote:
>>>         Dear Christian,
>>>
>>>           So I was comparing the results with the latest version of
>>>         Heriwg++ as part of our testing before the next release and
>>>         we were much further off than I expected. After looking at
>>>         the analysis and the paper I believed the paper was plotting
>>>         d sigma /dy/dpT and the analysis d sigma/d|y|/dpT which
>>>         differ by the factor of 1/2. I contacted Vojtech and he
>>>         agreed it was wrong so I made the change.
>>>
>>>           If it is wrong we can change it back
>>>
>>>         Best Wishes
>>>
>>>         Peter
>>>         ------------------------------------------------------------------------
>>>         *From:* Christian Gütschow [chris.g at cern.ch
>>>         <mailto:chris.g at cern.ch>]
>>>         *Sent:* 21 May 2015 18:44
>>>         *To:* Rivet; RICHARDSON P.
>>>         *Subject:* bug in ATLAS_2014_I1325553 (inclusive jets)
>>>
>>>         Dear Rivet authors,
>>>
>>>         it looks like a bug has been introduced in the current trunk
>>>         version of the ATLAS inclusive jets measurement (the version
>>>         from the last release is fine). Specifically, the
>>>         normalisation factor in the finalise routine has been modified:
>>>
>>>         https://rivet.hepforge.org/trac/browser/src/Analyses/ATLAS_2014_I1325553.cc#L83
>>>
>>>         to include an additional factor of 0.5 -- apparently to fix
>>>         an issue with the normalisation.
>>>
>>>         There should be no such factor as absolute rapidity has been
>>>         used consistently throughout the analysis and such a factor
>>>         is only really necessary if absolute and signed rapidities
>>>         are being mixed (axis label vs cross section differential).
>>>
>>>         Note that the original version (without 0.5) has been
>>>         validated and no issues with the normalisation have been
>>>         observed, so I would recommend to unfix this again. :-)
>>>
>>>
>>>         Many thanks,
>>>         Chris
>>>
>>>         -- 
>>>
>>>          Dr. Christian Gütschow
>>>
>>>          TU Dresden
>>>          Institut für Kern- und Teilchenphysik
>>>          Zellescher Weg 19
>>>          01069 Dresden
>>>
>>>         > E17, Andreas-Schubert-Bau
>>>         > chris.g at cern.ch <mailto:chris.g at cern.ch>
>>>
>>>
>>>
>>>         _______________________________________________
>>>         Rivet mailing list
>>>         Rivet at projects.hepforge.org  <mailto:Rivet at projects.hepforge.org>
>>>         https://www.hepforge.org/lists/listinfo/rivet
>>
>>
>>
>>
>>     -- 
>>
>>      Dr. Christian Gütschow
>>
>>      TU Dresden
>>      Institut für Kern- und Teilchenphysik
>>      Zellescher Weg 19
>>      01069 Dresden
>>
>>     > E17, Andreas-Schubert-Bau
>>     > chris.g at cern.ch <mailto:chris.g at cern.ch>
>>
>
>
>
>
> -- 
>
>  Dr. Christian Gütschow
>
>  TU Dresden
>  Institut für Kern- und Teilchenphysik
>  Zellescher Weg 19
>  01069 Dresden
>
> > E17, Andreas-Schubert-Bau
> > chris.g at cern.ch <mailto:chris.g at cern.ch>
>

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