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Automatic calculation of LHC processes: From Lagrangian to event generation

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This joint research project is devoted to the development of new computing techniques to improve the quality of the comparison between theory and LHC experimental data. It should lead, not only to the automatic calculation of process matrix elements and, therefore, physics observables, but also to the automatic construction of full-fledged event generators which are the basis of any modern data analysis.
This fully automatic approach is complementary to already existing general-purpose event generators based on hand calculation of a limited set of final states. For many important physics processes at LHC no exact matrix-element calculations are available. Thus, the comparisons rely on the parton-shower simulation of multiparticle final states, which is a too crude approximation for many important studies leading sometimes to grossly unreliable predictions. The advantage of the proposed development based on the CompHEP package (automatic Feynman diagram computation) is not only to provide the full massive matrix element, even for those involving many final state particles for any given physics model, but also to produce tools to build event generators at partonic level. Then this code can be embedded in general purpose event generators to benefit from the implementation of the initial state effects and final state hadronisation. HEP experiments already interfaced to those programs will be able to run their simulation package, like GEANT4, in a straightforward way.
The project covers two strongly linked levels of studies: one addresses the development of software tools, like automatic matrix element calculation, event generation at partonic level and interface with harmonisation and detector simulation programs, the other deals with the phenomenological analysis of important LHC processes. Both contribute to the other. Automatic calculations are used to perform physical analysis at the necessary level of computational accuracy and, conversely, once a complex calculation has been done, new automatic methods can be developed and implemented.

The main physics interests in this project will go to selected Electro-Weak (EW) physics, both for signal and background processes, providing the so-called complete signal-to-background analysis.

This includes:
i) new discovery channels of Standard Model (SM) Higgs boson and scalar bosons in extended models, with the study of their couplings;
ii) study of the t-quark interactions, its Yukawa couplings and CKM elements;
iii) investigation of the phenomenology of new particles (superpartners and leptoquarks) within extended models (MSSM, gauge mediated symmetry breaking models, SUGRA) and by model independent analysis.

Advanced computational techniques are crucial to successfully carry out this programme. The CompHEP package that has been created under the support of previous INTAS grants (93-0024 and 93-1180) will be developed further to cover the new physics scope, the specific requests from the LHC experiments and the CERN programming environment LHC++.

The main objectives are:
i) to develop tools for the automatic calculation of Feynman diagrams based on the helicity amplitude method and the implementation of new gauge physics models;
ii) to create efficient MC generator technique for partonic event;
iii) to develop automatic interface with the physics level event generator PYTHIA.

INTAS 93-0024 and 93-1180 grants have given the initial seeds for this ambitious programme, in particular by providing funding for computer equipment. This new project welcoming new INTAS and NIS collaborators, will, mainly, give salary and travel support to the NIS participants in order to carry out the physics computations necessary for the success of LHC project.
Participation of young physicists has been an important issue in the organisation of this collaboration. About 40% of the NIS participants are less than 35 year old.
Developing multi-disciplinary collaborations, as it is the case in this programme where theory, experimental and computing expertise are involved, is generally a quite difficult task in our respective national institutions. INTAS and CERN, European based scientific organisations, provide a unique framework where such frontier project can be undertaken.

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Centre National de la Recherche Scientifique
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Chemin de bellevue,
74941 Annecy-le-Vieux
Frankreich

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Letzte Aktualisierung: 30 Oktober 2002

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Permalink: https://cordis.europa.eu/project/id/INTAS-1999-00377/de

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