[Rivet] Fwd: Ratio measurements in Rivet

[Gerhard Brandt]

Hi Monica,

I think nowadays responsible are Roman and Kiran, and i put the RIVET
authors in CC for good measure.

We have indeed recently started discussing this issue with them and
it seems that a real ratio analysis is currently not possible (at least 
it wasn't two months ago) - I will forward previous conversation.

what might be possible with some manual hacking is to run two 
consecutive RIVET analyses and then manually divide the histograms.
I do not think this has been done, but I take it from Roman's and Andy's 
reply that this is possible...
it does not of course correctly correlate the uncertainties
so the usefulness is limited, basically to the central value

Gerhard


On 5/14/14, 8:30 AM, Monica Dunford wrote:
> Hi Ulla and Gerhard,
>
> A post-doc in my group was asking about ratios in Rivet (see below). Do
> you know anything about the status of this in Rivet? Or know who I
> should speak to?
>
> Cheers,
> Monica
>
>
>>
>> -------- Original Message --------
>> Subject: 	Ratio measurements in Rivet
>> Date: 	Mon, 12 May 2014 12:49:35 +0200
>> From: 	Felix Müller <fmueller at cern.ch>
>> To: 	hn-atlas-Generators (General discussion and questions about ATLAS
>> MC generators) <hn-atlas-generators at cern.ch>
>> CC: 	Shima Shimizu <Shima.Shimizu at cern.ch>,
>> "Felix.Mueller at kip.uni-heidelberg.de"
>> <Felix.Mueller at kip.uni-heidelberg.de>
>>
>>
>>
>> Dear Rivet experts,
>>
>> I'm currently implementing the Rivet routine for the inclusive jet cross
>> section measurement at s = 2.76 TeV (ATLAS_2013_I1228693). This analysis
>> also contains the ratio to the measurement at s = 7 TeV from 2010. The
>> data for both, the cross section and the ratio is available on HepData
>> (http://hepdata.cedar.ac.uk/view/ins1228693).
>>
>> While the implementation of the cross section at one CM energy is easy
>> and straight forward, I'm wondering how the ratio between the two CM
>> energies can be done. Does Rivet offer a general method to combine two
>> datasets? Or must this combination of different CM energies happen in a
>> post-processing step, outside Rivet?
>>
>> Thanks a lot!
>> Cheers, Felix
>>
>>
>