[Rivet] Rivet routine for D0_2000_I503361

[Frank Siegert]

Thanks, this is exactly what I was after.

Holger, which direction does the 15-20% offset go? Did you really set
LJET:=1 (this would mean the 2->1 process is done at NLO, i.e. nothing
here) or did you mean LJET:=2?

Comparing to NLO we should definitely not see a 15-20% global offset,
and this could point to wrong lepton cuts.

Cheers,
Frank


On 1 October 2015 at 20:04, Gavin Hesketh <gavin.hesketh at ucl.ac.uk> wrote:
> Hi,
> sorry for weighting in again, but I'm pretty sure there should not be an ET
> cut on the electrons... Section V in the paper mentions correcting for this.
> Do the distributions look completely off if you remove that cut?
> cheers,
> Gavin
>
>
> On 01/10/15 16:01, Holger Schulz wrote:
>>
>> On 01/10/15 15:43, Frank Siegert wrote:
>>>
>>> Hi Holger,
>>>
>>> given that you have committed this analysis now as validated (using
>>> Sherpa), I was just wondering whether the normalisation looks as
>>> expected. Simone mentioned that his validation was done using Pythia8,
>>> and it would be surprising that Pythia8 matches the cross section
>>> correctly -- one would expect a global ~ -15% offset due to the
>>> missing NLO accuracy.
>>>
>>> Have you compared it against NLO Sherpa (or LO Sherpa scaled with an
>>> appropriate k-factor) and see good agreement? Anything else could
>>> point to missing (lepton?) cuts.
>>
>>
>> Hi Frank,
>>
>> the paper states an ET cut for the electrons of at least 25 GeV, I
>> implemented
>> that one. I ran Sherpa with LJET=1, NJET=1 using the example setup and see
>> a shape very much compatible with data. The offset is about 15-20%. I ran
>> 100000 weighted events using trunk without MI_HANDLER
>>
>> Here is the shape comparison for the peak region:
>>
>>     https://users.hepforge.org/~holsch/d01-x01-y01.pdf
>>
>> And this is the distribution up to zpt=150 GeV:
>>
>>     https://users.hepforge.org/~holsch/d01-x01-y01_150GeV.pdf
>>
>> Cheers,
>> Holger
>>
>>> Cheers,
>>> Frank
>>>
>>>
>>>
>>> On 28 September 2015 at 11:39, Simone Amoroso<simo.amoroso at gmail.com>
>>> wrote:
>>>>
>>>> Hi Frank,
>>>>
>>>> For the selections (since the paper was not really clear), I copied what
>>>> was used in the Z/W pT ratio (already in RIVET),
>>>> which makes use of the same selections.
>>>>
>>>> The validation was simply made by running Pythia8, I definitely didn’t
>>>> apply k-factors,
>>>> but I might have rescaled the prediction to data (I honestly don’t
>>>> remember).
>>>>
>>>> cheers,
>>>> Simone
>>>>
>>>>> On 23 Sep 2015, at 16:07, Frank Siegert<frank.siegert at cern.ch>  wrote:
>>>>>
>>>>> Hi all,
>>>>>
>>>>> I have just started to look at this to get it in for the imminent
>>>>> release. The paper is at first glance not very clear on which
>>>>> selection requirements were retained for the final cross section
>>>>> measurement. Simone, do you remember, why you removed the electron ET
>>>>> cuts? Did they correct completely for the electron acceptance?
>>>>>
>>>>> And for your validation plot, I was wondering which Monte-Carlo did
>>>>> you run, and is the prediction scaled by a (K-)factor?
>>>>>
>>>>> Cheers,
>>>>> Frank
>>>>>
>>>>>
>>>>>
>>>>> On 1 July 2015 at 15:57, Chris Pollard<cpollard at cern.ch>  wrote:
>>>>>>
>>>>>> Hi Simone,
>>>>>>
>>>>>> In this analysis I notice that there is no lepton pt cut imposed in
>>>>>> the
>>>>>> ZFinder. Was this intentional? I guess at least one lepton needs to
>>>>>> have pT
>>>>>>>
>>>>>>> 10 GeV to fire the trigger?
>>>>>>
>>>>>> Chris
>>>>>>
>>>>>> On Thu, May 7, 2015 at 9:51 AM, Andy Buckley<andy.buckley at cern.ch>
>>>>>> wrote:
>>>>>>>
>>>>>>> On 07/05/15 07:55, Simone Amoroso wrote:
>>>>>>>>
>>>>>>>> Hi Andy,
>>>>>>>>
>>>>>>>> I made a new RIVET routine for the D0 RunI measurement of the Z pT.
>>>>>>>> Below a validation plot and attached the tarball.
>>>>>>>
>>>>>>> Thanks Simone, I've put it in the analysis contrib area and we'll get
>>>>>>> it
>>>>>>> into a new Rivet release as soon as possible.
>>>>>>>
>>>>>>> Andy
>>>>>>>
>>>>>>> --
>>>>>>> Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
>>>>>>> Particle Physics Expt Group, University of Glasgow
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>>>>>>
>>>>>>
>>>>>>
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