[Rivet] Problems when simulating an analysis

[Chiara Zampolli]

Dear all,

        I am attaching here the files for an analysis that I am trying to perform with Rivet. When I compared the results with Rivet
with those that I obtain runnin
g with the ALICE analysis tools (at MonteCarlo level), with the same Pythia tune, I obtain different
results (see attachment). The analysis is meant to produce the multiplicity distributions of charged particles with eta in [-0.8, 0.8], pt > ptcut,
for ONLY the events with at least one such particle. The ptcut value can be 0.15, 0.5 or 1 GeV/c, and they correspond to the three histograms of the analysis.

        Could someone please take a look at the analysis I wrote (which is very short) and see if I made any mistake there? I tried to check the standard analysis (the one not with Rivet),
and there I cannot find anything weird… Even though I might be wrong, of course. But if i could exclude that the problem is in the Rivet code, it would be helpful.

I have also noticed that if I remove the weight in the filling of the histograms, I obtain different results (see further attachment for two out of the three histograms created in my analysis).
What is this "weight"? How is it calculated? I thought it was equal to 1.

Thanks in advance for your help, and Regards,

                Chiara


[cid:24a40d88-3217-4e38-91c7-2b3b0b1e393b at cern.ch]
        I am attaching here
[cid:bf915a04-6fe6-424d-8c32-bc94f53395d8 at cern.ch]
the files for an analysis that I am trying to perform with Rivet. When I compared the results with Rivet
with those that I obtain running with the ALICE analysis tools (at MonteCarlo level), with the same Pythia tune, I obtain different
results. The analysis is meant to produce the multiplicity distributions of charged particles with eta in [-0.8, 0.8], pt > ptcut,
for ONLY the events with at least one such particle. The ptcut value can be 0.15, 0.5 or 1 GeV/c.
        Could you please take a look at the analysis I wrote (which is very short) and see if I made any mistake there? Or if there
is someone else to whom I
should better write, could you please let me know?

        Thanks in advance, and sorry to bother you again.

                Chiar
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