[Rivet] CMS_2015_I1384119 plugin (minbias eta)

[Holger Schulz]

On 22/10/15 18:10, Janssen Xavier wrote:
> Hi Holger,
>
>
>> On 22 Oct 2015, at 18:25, Holger Schulz <holger.schulz at durham.ac.uk 
>> <mailto:holger.schulz at durham.ac.uk>> wrote:
>>
>> On 22/10/15 17:15, Janssen Xavier wrote:
>>> Hi Holger
>>>
>>> Oh Sorry, the label should be 1/N dNch/deta ofc as in the paper.
>> Hi Xavier,
>>
>> thanks for the clarification, I'll fix this for the next release.
>>
>> I just cross read the paper, there is one sentence that concerns me a 
>> bit:
>>
>>     The data points and uncertainties are symmetrized in ±η.
>>
>
> Yes, we have always being doing it since the 900 GeV paper I believe, 
> which means we average the positive and negative bins and plot this 
> average on both the + and - corresponding bins. So the normalisation 
> is taken correctly. This means we double the statistic of the 
> measurements as there is no reason to have different physics on both 
> side ...
>
>> See I was running a minbias MC through the analysis and it is pretty
>> much a factor 2 off (attachment).
>
> I can try to run it myself as I am just done with integrating 2.4.0 in 
> our CMS software. I let you know.

Great!
  10k events are sufficient. I am struggling to get Pythia8 to run :)

Cheers,
Holger

>
>> Do you remember who made the validation plots that came with the 
>> tarball in rivet contrib?
>> I would like to run a setup present in those plots to rule out any 
>> rivet problems.
>
> I think it was Hannes, so he is already in cc.
>
>> Thanks,
>> Holger
>>
>
> Cheers, Xavier.
>
>>> Cheers, Xavier.
>>>
>>>
>>>> On 22 Oct 2015, at 18:10, Holger Schulz<iamholger at googlemail.com>  wrote:
>>>>
>>>> Hi Xavier, Hannes,
>>>>
>>>> I am having trouble understand the 13TeV pseudorapidity
>>>> distribution in the CMS_2015_I1384119 analysis.
>>>>
>>>> In the rivet version, the ylabel says 1/N dN/deta which would
>>>> mean that the integral of the curve should be =1 --- however
>>>> it is more like 24.
>>>>
>>>> I had a look into the paper to see if there is some normalisation
>>>> factor but found that there on Figure 3 the ylabel is not mentioning
>>>> a normalisation, i.e. it says dNch/d eta.
>>>>
>>>> Could you please clarify what the normalisation of this histogram
>>>> is?
>>>>
>>>> Thanks,
>>>> Holger
>>>>
>>>>
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>>
>> <eta.pdf>
>

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