[Rivet] bug in ATLAS_2014_I1325553 (inclusive jets)

[Christian Gütschow]

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.

Cheers,
Chris

On 21 May 2015 at 21:58, Holger Schulz <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>
> 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]
>> *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
>>
>>
>>
>>   _______________________________________________
>> Rivet mailing listRivet at projects.hepforge.orghttps://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
>
>
>


-- 

 Dr. Christian Gütschow

 TU Dresden
 Institut für Kern- und Teilchenphysik
 Zellescher Weg 19
 01069 Dresden

 > E17, Andreas-Schubert-Bau
 > chris.g at cern.ch
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