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

[Albert Knutsson]

Hi Holger,

yes that is correct.

We usually aim for exactly the same MC prediction for the validation. 
This time, as far as I understand (Markus in cc, please correct me if 
I'm wrong), the original MC sample used in the paper had been deleted, 
and for practical reasons a new one was produced with pythia8.

Cheers,
Albert


On 26/02/15 10:30, Holger Schulz wrote:
> 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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