Hi Zafar,
this is something else, it's not your fault and can be easily fixed.
If one uses SPECSOUR with PPSOURCE, he/she has to be made aware that the
concurrent use of centre-of-mass quantities in USRYIELD scoring must be
avoided, since it's subject to a flaw. Use instead pseudorapidity in the
lab frame, which is exactly what you want since in this special case lab
frame and cm frame are the same thing. This way the fake underestimation
of a factor of two will disappear.
Cheers
Francesco
**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854
On Mon, 6 Mar 2017, Zafar Yasin wrote:
> Dear Francesco,
>
> Thank you for pointing out our mistake and for nice explanation of Nev factor.
> The revised attached results seem reasonable but still the difference is around a factor
> of two. This may be due to Nev factor and DMPJET vesion? Am I right or something else?
>
> Kind regards,
> Zafar
> ________________________________________
> From: Francesco Cerutti
> Sent: 05 March 2017 21:26
> To: Zafar Yasin
> Cc: fluka-discuss_at_fluka.org
> Subject: RE: [fluka-discuss]: Transverse momentum
>
> Dear Zafar,
>
> 1/2pipT shall be intended as 1/(2*pi*pT), and not 1/2*pi*pT as in your
> Excel file. Obviously this impacts substantially the resulting shape of
> your FLUKA curve...
>
>
> A couple of additional remarks.
>
> First, the meaning of Nev is the normalization by the subset of events
> complying with the experimental cuts applied (i.e. selected ranges of
> pseudorapidity, transverse momentum, particle charge), rather than by all
> collision events as FLUKA does by default. However, here we are dealing
> with a minimum bias sample, so the correction turns out to be small (the
> FLUKA curve should get increased by a few percent, since some simulated
> events are irrelevant and should not be counted, i.e. one should divide
> by a smaller number of events and not by the number of simulated events).
>
> Second, the DPMJET version presented in the PhD thesis I previously
> indicated, further improves the agreement with LHC data (as in the plot I
> pointed at, where the theoretical curve is higher than what you will get
> with FLUKA2011 after proper normalization) and will be made available with
> the next major release.
>
> Cheers
>
> Francesco
>
> **************************************************
> Francesco Cerutti
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> tel. ++41 22 7678962
> fax ++41 22 7668854
>
> On Mon, 27 Feb 2017, Zafar Yasin wrote:
>
>> Dear Francesco,
>>
>> Thank you so much for your reply. We have compared our FLUKA results with the experimental data
>> from ATLAS experiment as suggested by you. Unfortunately, again we are observing the differences
>> between the two. We are not sure either this comparison is acceptable or not. If you can please have
>> a look in the attached excel file. We are taking Nev equal to 1 and comparing with the data where they
>> have also used Nev to 1.
>>
>> Kind regards,
>> Zafar
>> ________________________________________
>> From: Francesco Cerutti
>> Sent: 20 February 2017 11:08
>> To: Zafar Yasin
>> Cc: fluka-discuss_at_fluka.org
>> Subject: RE: [fluka-discuss]: Transverse momentum
>>
>> Hi Zafar,
>>
>> I'm not convinced by your experimental data normalization.
>> Take a look at http://cds.cern.ch/record/2231593?ln=en
>> and in particular at Figure 7.16 (bottom) on page 113 (121 in the pdf
>> file). Those are exactly your p-p charged particle transverse momentum
>> distributions as measured by ATLAS at 0.9 and 7 TeV center of mass energy.
>> And they lie a factor 10 below your curve, in pretty good agreement with
>> FLUKA results (you may guess that, as routinely performing LHC p-p
>> collisions for accelerator operation and upgrade purposes, we would have
>> been ourselves intrigued by a factor 10 discrepancy with data, if real).
>>
>> Kind regards
>>
>> Francesco
>>
>> **************************************************
>> Francesco Cerutti
>> CERN-EN/STI
>> CH-1211 Geneva 23
>> Switzerland
>> tel. ++41 22 7678962
>> fax ++41 22 7668854
>>
>> On Mon, 20 Feb 2017, Zafar Yasin wrote:
>>
>>>
>>>
>>> Dear Vittorio and FLUKA experts,
>>>
>>>
>>> In continuation of my previous email, we have simulated the Pt distribution
>>> of primary charged particles for P-Pb and P-P collisions at center of mass
>>> energy of 5.02 TeV. While comparing with experimental data, FLUKA
>>> simulations underestimates the results in the order of 5 to 50, as shown in
>>> the attached graphs. We have used the model “ldpm3qmd”. For p-p collisions,
>>> the difference is of the order of 10 and in the attached graph for P-P
>>> interactions, FLUKA results are multiplied by 10 to match with the
>>> experimental data. Input files are also attached. We are not finding the
>>> reason of this mismatch.
>>>
>>>
>>> Any kind of help will be appreciated.
>>>
>>>
>>> Kind regards,
>>>
>>> Zafar Yasin
>>>
>>>
>>> ____________________________________________________________________________
>>> From: Vittorio Boccone [dr.vittorio.boccone_at_ieee.org]
>>> Sent: 22 November 2016 23:52
>>> To: Zafar Yasin
>>> Cc: fluka-discuss_at_fluka.org
>>> Subject: Re: [fluka-discuss]: Transverse momentum
>>>
>>> Dear Zafar,
>>> the scope of your simulation seems limited to the study of primary charged
>>> particles in following p-Pb interactions. The paper you cite does not
>>> specify which DPMJET version was used for the generation
>>> (probably DPMJET-II?)
>>>
>>> Both DPMJET-II and III are usable in FLUKA or as standalone.
>>> Yes you can do this with FLUKA although it seems just a comparison between
>>> different generators, but remember that you might have a non trivial event
>>> selection in order to obtain the desired quantity.
>>>
>>> Best,
>>> Vittorio
>>> On 21 Nov 2016, at 13:12, Zafar Yasin <Zafar.Yasin_at_cern.ch>
>>> wrote:
>>>
>>> Dear FLUKA experts,
>>> We want to use FLUKA to calculate the transverse momentum distribution
>>> of primary charged particles in the p-Pb interactions and want to
>>> compare our results obtained using HIJING and with the data from ALICE
>>> experiment. Actually, we want to reproduce the attached paper. The
>>> range of psudorapidity is 0.3 to 1.8 and transverse momentum range is
>>> 0.5-20 Gev/c.
>>>
>>> Before starting our work, I want to confirm is it is possible with the
>>> FLUKA code?
>>>
>>> Thank you and best regards,
>>> Dr. Zafar Yasin
>>> PINSTECH, Islamabad
>>> Pakistan
>>> <IJMPApaper.pdf>
>>>
>>>
>>>
>>>
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Received on Tue Mar 07 2017 - 11:12:06 CET