[Rivet] HepData consistency

[Christian Gutschow]

As far as I’m aware — if it’s an actual erratum, then the HEPData tables will be fixed. If however — for example — a more precise luminosity calibration becomes available subsequently (which would only shifts the central values by the same amount), then usually a note is added to the description of the HEPData entry, but this change isn’t propagated through to the tables. The logic (coming from upstairs, mind you) being that the old values aren’t wrong per se, but rather reflect the most up-to-date (but still preliminary) calibration available at the time of publication.

Cheers,
Chris


On 4 Oct 2016, at 22:37, Andy Buckley <andy.buckley at cern.ch<mailto:andy.buckley at cern.ch>> wrote:

Eek, ATLAS isn't propagating errata to HepData?!

Hope I misunderstood...

Andy


On 04/10/16 13:39, Chris G wrote:
Hi both,

actually it’s the other way around — the HEPData tables weren't changed and just a note has been added to the entry. The modification would then have to be applied manually.

Now, there were a couple of cases where I wrote a routine for an old analysis where I noticed this and put that manual change in, such that the Rivet reference data is fully up to date.

Cheers,
Chris

On 4 Oct 2016, at 13:31, Andy Buckley <andy.buckley at cern.ch<mailto:andy.buckley at cern.ch>> wrote:

Absolutely. I'm not sure how good the groups are at propagating errata to us. There's maybe been an assumption that we'll pick up the updates from HepData -- which was our intention all along -- but the divergence of HD from what we're given has broken that. It's a big problem... and not one we can ignore. We need to involve the HepData people.

Andy



On 04/10/16 13:07, David Grellscheid wrote:
Hi Chris,

In that case, shouldn't the change propagate to Rivet, too?

See you,

David


On 04/10/16 12:46, Christian Gutschow wrote:
Hi Holger,

there are cases where the Rivet reference data values and the HEPData
reference values will be different because e.g. there’s a note on
HEPData saying the central values ought to be shifted by some factor in
order to account for the the final luminosity calibration for the
respective year (which hadn’t been available when the HEPData entry was
made public).

Cheers,
Chris



On 4 Oct 2016, at 11:39, Holger Schulz <holger.schulz at durham.ac.uk<mailto:holger.schulz at durham.ac.uk>
<mailto:holger.schulz at durham.ac.uk>> wrote:

Hi,

I wrote a script that does some trivial checks for the reference
data files shipped with rivet and their counterpart obtainable from
HepData.

It generates reports which can be found here:

  https://users.hepforge.org/~holsch/HepDataRivetReports/

There is quite a number of inconsistencies.

Quite often in LHC analyses the dxy tags differ, a number of
ref data sets differ in the number of data points between rivet and
hepdata
and of course there are several analyses where the data is not in hepdata
at all.

And then there are some "goodness of fit" issues where I compare
two scatters as such (can clearly be improved):


  def gof(P1, P2):
      chi=0.0
      for num, p in enumerate(P1):
          chi += (p.y - P2[num].y)
          chi += (p.yErrAvg - P2[num].yErrAvg)
          chi += (p.x - P2[num].x)
          chi += (p.xErrAvg - P2[num].xErrAvg)
      return chi


So yeah I don't really know what course of action to take but it seem
quite clear
that HepData and rivet have diverged quite substantially.

Holger



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—

Dr. Christian Gütschow

Department of Physics and Astronomy
University College London
Gower Street
London WC1E 6BT

D10 Physics Building
+44 (0)20 7679 3775
chris.g at cern.ch<mailto:chris.g at cern.ch> <mailto:chris.g at cern.ch>






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




 —

 Dr. Christian Gütschow

 Department of Physics and Astronomy
 University College London
 Gower Street
 London WC1E 6BT

 > D10 Physics Building
 > +44 (0)20 7679 3775
 > chris.g at cern.ch<mailto:chris.g at cern.ch>




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