[Rivet] European project

[Klaus Werner]

Dear Rivet authors,

I am going to present a project in the framework of the “H2020 European 
Integrating Initiative in Hadron Physics” around “Connecting experiments 
and Monte-Carlo simulations in heavy ion physics (HIP)”, see below. I 
learnt from my ALICE collegues that there is (a relatively new) activity 
of adding heavy ion applications  to Rivet  (where I mean heavy ion 
physics in a broad sense, including for example high multiplicity pp 
collisions).

So if there are in your environment people interested in such an 
project, please let me know.
Many thanks in advance
Klaus
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There is a new effort from the hadron physics community to apply for 
funding within the “H2020 European Integrating Initiative in Hadron 
Physics”. The anticipated budget is 10 MEuros for 4 years. Several 
European infrastructures will play a crucial role in ensuring 
transnational access : CERN, GSI/FAIR, LNF Frascati, MAMI and ECT* Trento.

Barbara Erazmus, who coordinates the initiative, asked me to define an 
original research project and present a corresponding letter of intent 
(LoI) by the end of September, which should be presented at a meeting in 
Nantes end of October. The steering committee will preselect projects 
which can be coherently included into a global proposal on 
hadron-physics to be submitted to Brussels. So the time schedule is tight!

I would like to construct a project around “Connecting experiments and 
Monte-Carlo simulations in heavy ion physics (HIP)”, where HIP is meant 
to include “heavy-ion-like effects” in small systems. Whereas in 
particle physics powerful tools exist (like Rivet and MCplots for 
example) to use Monte-Carlo (MC) generators in order to analyse 
experimental data in a very transparent fashion, no systematic approach 
of this kind exists yet in HIP. Whereas we have a good qualitative 
understanding of the reaction mechanisms, we still lack of a complete 
and detailed understanding of these complex reactions, and the only way 
to get there is via Monte Carlo simulation, using state of the art 
"generators" based on the present knowledge of the theoretical concepts 
behind these complex collisions. There is an increasing demand for such 
simulations, in particular since “flow-like effects” have been also 
observed in proton-proton collisions, and traditional Monte-Carlo 
generators like Pythia have difficulties to describe such data.

It is important to bring together the MC model builders (including 
theoreticians who provide the building blocks) and experimentalists, to 
collaborate, to define common strategies, and to work on the structures 
which allow to test and develop MC generators to eventually get to a 
quantitative understanding of the data. There is little activity in this 
direction in HIP, since compared to the traditional proton-proton 
generators there are many additional technical challenges, mainly due to 
the fact that CPU times per event in HIP are huge, a typical simulation 
run may represent several terabytes of data, and often the observables 
are very complex quantities.

All kinds of observables should be covered. A realistic generator should 
be able to generate “events”, including all aspects (soft, hard, light 
flavor, heavy flavor etc), and only a multi-observable analysis will 
finally allow to understand the dynamics.

This project could help

- to organize workshops to bring together the experts as well as young 
researchers and students,

- to finance mutual visits in partner laboratories,

- to finance postdocs (and PhD scholarships if possible) in particular 
to work on the technical issues of linking MC generation and experiment


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