[Rivet] ATLAS_2014_I1306294 and comparison to data points

[Hannes Jung]

Hi Gavin

thanks for clarification.
But then I guess it should be also corrected in the Rivet plugin,
as it is confusing when the data and MC predictions are different
by a factor of 2....
Cheers
Hannes

On 13.04.2015, at 15:47, Gavin Hesketh <gavin.hesketh at ucl.ac.uk<mailto:gavin.hesketh at ucl.ac.uk>> wrote:

Hi Hannes,
in the data analysis we did combine the electron and muon channels. We unfold to a fiducial volume where the electron and muon channels are identical, so then just divide the data result by 2 to get a per-lepton-channel cross section.
In other words, you can compare either a Z->ee only run, or a Z->mumu only run to the data.
cheers,
Gavin

On 13/04/15 05:42, Hannes Jung wrote:
Dear Christian

thanks a lot for your reply.
Yes, but the data are the sum of electron and muon channel, as far as I
can conclude
from the paper, since it is written:
"Since the electron and muon Z boson decay channels are combined to
increase
the precision of the signal fits to data.... "

Cheers
Hannes


On 12.04.2015, at 20:58, Christian Gütschow <chris.g at cern.ch<mailto:chris.g at cern.ch>
<mailto:chris.g at cern.ch>> wrote:

Hi Hannes,

unfolded data has only been provided for the combined lepton channels,
which is why the data points are the same for all three plugins. The
default plugin will look for Z candidates in the electron channel. The
two other plugins are just there for convenience, i.e. to allow users
to specify the decay channel they want to look at.

In the data, the two lepton channels were found to be consistent with
each other, so it's okay to compare their combination (i.e. the
weighted average) to the individual lepton channels in MC.

Cheers,
Chris

On 12 April 2015 at 19:18, Hannes Jung <hannes.jung at desy.de<mailto:hannes.jung at desy.de>
<mailto:hannes.jung at desy.de>> wrote:

   Hi Andy

   thanks for your fsat reply.
   Yes, the versions for muon, electron are available, and
   one without specification, but it is the muon one...
   the data points are all the same.... the combined ones, I guess.

   Thanks again
   Cheers
   hannes

   > On 12.04.2015, at 19:46, Andy Buckley <andy.buckley at cern.ch<mailto:andy.buckley at cern.ch> <mailto:andy.buckley at cern.ch>> wrote:
   >
   > On 12/04/15 17:07, Hannes Jung wrote:
   >> Dear Rivet experts
   >>
   >> I was wondering, how the comparison of ATLAS_2014_I1306294
   >> to the data points from the measurements should be interpreted:
   >> it seems the rivet plugin either works for the electron OR muon
   >> channel, while the data points are the sum of both.
   >>
   >> Is it correct, that one cannot directly compare the result from the
   >> Rivet plugin with the data ?
   >
   > Hi Hannes, I think Gavin Hesketh (identified as the author of this
   > plugin at e.g.https://rivet.hepforge.org/analyses#ATLAS_2014_I1306294)
   > is on the Rivet list, but I've CC'd him explicitly. Typically analysis
   > authors will know more details than the Rivet authors do... but I hope
   > that the analyses *have* all been written so that MC tuns can be
   > compared directly to the data... that's the point!
   >
   >> Why are the electron and muon channels done in separate plugins,
   >> and not added as was done in the data ?
   >
   > To me it looks like all versions are available... no?
   >
   >> PS: I am running Rivet 2.2.1
   >
   > Hurrah! ;-)
   >
   > Andy
   >
   > --
   > Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
   > Particle Physics Expt Group, University of Glasgow

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   Hannes Jung
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   Fax: +49 (0) 40 8994 3741 <tel:%2B49%20%280%29%2040%208994%203741>
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--

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> <mailto:chris.g at cern.ch>


***********************************************************************
Hannes Jung
Email: Hannes.Jung at desy.de<mailto:Hannes.Jung at desy.de> <mailto:Hannes.Jung at desy.de>
mobile :+49 40 8998 93741
http://www.desy.de/~jung
Tel: +49 (0) 40 8998 3741
Fax: +49 (0) 40 8994 3741
DESY, CMS 01B/02.213
Notkestr.85, 22603 Hamburg, FRG
***********************************************************************





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***********************************************************************
Hannes Jung
Email: Hannes.Jung at desy.de<mailto:Hannes.Jung at desy.de>
mobile :+49 40 8998 93741
http://www.desy.de/~jung
Tel: +49 (0) 40 8998 3741
Fax: +49 (0) 40 8994 3741
DESY, CMS 01B/02.213
Notkestr.85, 22603 Hamburg, FRG
***********************************************************************




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