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 Mon Feb 20 2017 - 12:18:51 CET