[Rivet] ALICE input to Rivet - MC points (Xi and Omega pp 7TeV, ALICE_2012_I1097057)

[Antonin Maire (IPHC)]

Ah, sorry, Jesper, I forgot to answer one of your point.

We did not try to check exhaustively the specific instance of rivet 
analysis that was sent around, i.e. we did not compare a Rivet output 
with the MC points that we've just sent you
(Some tests were done 1 year ago by another third person, with an older 
rivet version; the comparison (Rivet/published MC points) was looking 
good but was not really checked down to utter details.)

The thing is that David needed to simulate a lot of Pythia Perugia2011 
events : to get a statistical uncertainty on the Omega d²N/dptdy limited 
to 1-3%, up to our highest Omega pT bin, 300e6 events were simulated.

Cheers,
    Antonin


Le 08/06/2015 19:02, Antonin Maire (IPHC) a écrit :
> Hello again,
>
>   David was the main actor for the Pythia simulation at the time of 
> the paper.
> We exchanged a few mails over the last days, to check we understand 
> similarly again our own developments.
>
> Among other things, Pythia 6 tunes Z1, Z2, Perugia 2011 simulations 
> were carried out.
> Pythia 8 was not tried at that time.
> Perugia 2011 was the one of best performance so became the one we 
> focused on.
>
>
> _About the Pythia generation and analysis :_
>
> - there is no special thing with the .cmnd config file.
> The central tune Perugia 2011 (350) was used as it is.
> The simlulated events are only "inelastic"  ones (i.e. allow for 
> single+double diffraction on top of the non-diffractive processes).
>
> - The MC analysis was performed via ROOT+TPythia6, so that TH1 can be 
> used.
>
>
> _MC points_
>
>
> I enclose the table of values, taken from our macro to produce Fig.2 
> in http://arxiv.org/pdf/1204.0282v2.pdf.
> - David is certainly ashamed that I show the underwear of his old code 
> ( :-) ) but ok, let me give you some clarification in the naming of 
> things.
>
> 1. You will see Z2 in every array name but has no meaning (except for 
> Z2 tune values...)
>
> 2. The pt binning of ALICE data was used.
>     There are MC points simulated with the Xi binning (= 18 pT bins) 
> and this also for the Omega spectra, and conversely, MC points with 
> Omega binning (= 8 pT bins) also for the Xi spectra.
>     Which binning is used where is indicated by the first particle 
> name next to Z2, e.g. Z2XiSimulatedXiMinus
>
> 3. the Pythia values corresponds here to the integral of counts over 
> each pT bin width = a bin content in the ROOT sense.
>      Note these values ARE already further divided :
>     - by Delta(pT), the pT bin width, i.e. normalised by unit of pT.
>     - by the number of PYTHIA INEL events analysed
>
> 4. As a consequence of these normalised integral of counts,
>     4.1 - the division of MC/data is kept straightforward
>     4.2 - No need to worry about the right pT place to display the 
> ratio MC/data (cf. Lafferty-Wyatt NIM paper) : the points are 
> displayed at the centre of the pt bins.
>
>
>
> _Comparison CMS/ALICE_
>
> About the comparison of Xi+-(CMS) and Xi+-(ALICE), I enclose an 
> exchange I had recently with Andreas on the topic.
> The main point is NSD/INEL and the fact that CMS is not only Xi- but 
> the sum of Xi- and anti-Xi+
> http://mcplots.cern.ch/?query=plots,ppppbar,uemb-soft,Xim_pt
> That CMS plot should maybe be moved next the ALICE 900 GeV (Xi-+Xi+) 
> results
> http://mcplots.cern.ch/?query=plots,ppppbar,uemb-soft,Xi_pt
>
>
> We stay at disposal.
>
>
> Cheers,
>     David & Antonin
>
>
> Le 04/06/2015 16:39, Jesper Roy Christiansen a écrit :
>> Dear Boris and ALICE collaborators
>>
>> First of all thank you for providing the Rivet analysis, I have 
>> already tried to run it to test how the new model compares (but I 
>> need a bit more time before I am going to discuss that in details :)).
>>
>> I have also tried to compare this analysis with the Xi production 
>> measured by CMS (CMS_2011_S8978280), and the models/data seems to be 
>> quite different (the two analysis differs in that one is NSD, where 
>> as yours is fully inelastic). But before drawing any conclusions, I 
>> would first like to test whether I use the analysis correctly. I was 
>> therefore wondering if you have the MC data that is shown in the 
>> article available in a table format? That way I would be able to run 
>> Pythia with the same tune and verify that I can get the same result 
>> as is in your article (if you already did this, it is of course not 
>> needed for me to do it). Otherwise if you for some reason still 
>> happen to have the Pythia .cmnd file you used to generate the events 
>> used in the article laying around, I would be very happy if you could 
>> send me that (I know this is probably a bit too much to ask).
>>
>> Best regards
>> Jesper
>>
>>
>> On 06/03/2015 09:06 PM, Boris Hippolyte wrote:
>>> Dear Andy,
>>>
>>> 1) we believe the relevant plots are already included in the targz
>>> archive you received (in fact, these are very simple pT spectra
>>> plus a mT-m0 ratio as contained in our 2012 publication).
>>>
>>> 2) we checked this rivet analysis of our data against PYTHIA 8
>>> (not much statistics, admittedly) but we knew already that event
>>> generators have significant difficulties with baryons, and even
>>> more with multi-strange ones.
>>> -> the hope is that Peter and Jesper (also in cc) will manage to
>>> include these “rivetised" data for their next publication(s).
>>>
>>> 3) you can expect two other ALICE rivet contributions (related
>>> to identified pT spectra) in the coming days.
>>>
>>> Best regards,
>>> —B.
>>> -----------------------------------------------------------------------------------
>>> HIPPOLYTE Boris       B214 hippolyt at in2p3.fr <mailto:hippolyt at in2p3.fr>
>>> Département de Recherches Subatomiques
>>> Institut Pluridisciplinaire Hubert Curien
>>> 23, rue du Loess Bat20 BP28           phone: +33(0)388106646
>>> F-67037 Strasbourg cedex2             fax: +33(0)388106614
>>> -----------------------------------------------------------------------------------
>>>
>>>> On Jun 3, 2015, at 15:40, Andy Buckley <andy.buckley at cern.ch 
>>>> <mailto:andy.buckley at cern.ch>> wrote:
>>>>
>>>> Thanks Antonin,
>>>>
>>>> The analysis tarball is in the Rivet contrib downloads area now, and
>>>> we'll integrate it into the next release. Great to have another ALICE
>>>> analysis!
>>>>
>>>> Do you have any plots available from the analysis validation that 
>>>> we can
>>>> put in the archive for future reference?
>>>>
>>>> Best wishes,
>>>> Andy
>>>>
>>>>
>>>> On 03/06/15 00:15, Antonin Maire (IPHC) wrote:
>>>>> Good evening everybody,
>>>>>
>>>>>      I allow myself to contact you to provide an archive of a Rivet
>>>>> analysis related to ( Xi-, anti-Xi+, Omega-, anti-Omega+) pT spectra
>>>>> measured by ALICE.
>>>>>
>>>>> Multi-strange baryon production in pp collisions at (s)^1/2 = 7 
>>>>> TeV with
>>>>> ALICE,
>>>>> http://inspirehep.net/record/1097057
>>>>> http://arxiv.org/abs/1204.0282
>>>>>
>>>>> The "rivetisation" of the analysis was done by Boris Hippolyte 
>>>>> (thanks !).
>>>>> David Chinellato and myself were "primary" analysers and authors 
>>>>> of the
>>>>> above paper.
>>>>>
>>>>> We propose this Rivet analysis to be integrated into the official
>>>>> Rivet/src/Analyses
>>>>> (first, I guess, via 
>>>>> https://www.hepforge.org/archive/rivet/contrib/, up
>>>>> to the next release).
>>>>>
>>>>> I stay at disposal.
>>>>>
>>>>> Antonin Maire, ALICE member
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Rivet mailing list
>>>>> Rivet at projects.hepforge.org <mailto:Rivet at projects.hepforge.org>
>>>>> https://www.hepforge.org/lists/listinfo/rivet
>>>>>
>>>>
>>>>
>>>> --
>>>> Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
>>>> Particle Physics Expt Group, University of Glasgow
>>>
>>
>

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