[Rivet] CMS_2013_I1122847 (Forward-backward asymmetry in DY)

[Holger Schulz]

On 26/02/15 07:47, Albert Knutsson wrote:
> Dear Holger,
>
> The predictions in the paper are POWHEG+PYTHIA6. The predictions in 
> the validation plots are POWHEG+PYTHIA8 (as the file name of the 
> validation plots I sent indicate). Both of the predictions are 
> describing the data within the uncertainties of the data.
Hi Albert,

thanks for the clarification. Just to clarify, do I assume correctly 
that the plots you made were made using a standalone
run of powheg with pyhtia8 then?

Ideally, the validation process should use the exact same hadron level 
datasets used
in the analysis simply because then the results in the paper and the 
rivet plugin
must be identical --- which helps to spot mistakes in the implementation 
on one hand
but also to reveal possible shortcomings in rivet.

Best,
Holger




>
> It is already written in the info-file that QED radiation for the 
> leptons should be turned off. I added the the word born level now. New 
> tar-ball attached.
>
> Thanks and cheers,
> Albert
>
>
> On 25/02/15 16:36, Holger Schulz wrote:
>> Thanks Albert.
>>
>> So I am comparing Figure two, top left plot in the paper, blue line, 
>> i.e. "POWHEG (CT10) + PYTHIA (Z2) with PDF uncertainties"
>>
>> with d03-x01-y01, red line from your plots ("powheg2").
>>
>> They look kind of similar but are not identical. E.g. the last three
>> bins in the paper show the MC prediction to be consistently above
>> the data while your plots do not reflect that.
>>
>> Could you please tell me how exactly you validate your plugins?
>> I.e. are you running the plugin over the exact same dataset that
>> is equivalent to the blue line in the paper?
>>
>> Also, could you mention in the .info file that this analysis is Born 
>> level
>> only, please?
>>
>> Thanks,
>> Holger
>>
>>
>>
>> On 25/02/15 13:38, Albert Knutsson wrote:
>>>
>>> Dear Holger,
>>>
>>> please find them attached.
>>>
>>> Cheers,
>>> Albert
>>>
>>> On 25/02/15 12:52, Holger Schulz wrote:
>>>> On 25/02/15 07:40, Albert Knutsson wrote:
>>>>> Dear Rivet developers,
>>>>>
>>>>> please find attached the validated CMS plugin for 
>>>>> "Forward-backward asymmetry in Drell-Yan lepton pairs at 7 TeV",  
>>>>> CMS_2013_I1122847.
>>>>>
>>>>> Thanks in advance for putting it on the public download area and 
>>>>> including it in a future release.
>>>>>
>>>>> Cheers,
>>>>> Albert on behalf of CMS
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Rivet mailing list
>>>>> Rivet at projects.hepforge.org
>>>>> https://www.hepforge.org/lists/listinfo/rivet
>>>> Hi Albert,
>>>>
>>>> would you mind sending a link to your plots that show that the 
>>>> plugin is validated?
>>>>
>>>> Best,
>>>> Holger
>>>
>>
>

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