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

[Andy Buckley]

On 08/06/15 18:25, Antonin Maire (IPHC) wrote:
> 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.)

Hi Antonin, David, and co,

Presumably this analysis *has* been checked against something?! Or did I
misunderstand?

Thanks,
Andy


> 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
>>>>
>>>
>>
> 


-- 
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow