[Rivet] bug in ATLAS_2014_I1325553 (inclusive jets)

[RICHARDSON P.]

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<mailto:chris.g at cern.ch>

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