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Laboratoire d'Annecy-le-Vieux de
Physique Théorique

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Présentation du Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTh)

Le LAPTh est une unité mixte de recherche (UMR 5108) CNRS-INP/Université de Savoielapth-lapp. Le laboratoire est situé à Annecy-le-Vieux, 5km du centre d'Annecy et à 40km du CERN et de Genève. Les activités du LAPTh sont centrées autour de trois grands thèmes de recherche:

  • phénoménologie en physique des particules,
  • astroparticules et cosmologie,
  • physique mathématique: en particulier en théorie des champs, cordes et symétries.

Actualités

International Indo-French Laboratory: IFTHEP

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 LAPTh (F. Boudjema) is coordinating an Indo French Laboratory, LIA  (Laboratoire International Associé). The Indian coordinator is Rohini Godbole of the IISc (Indian Institute of Science) in Bangalore. The set up of the LIA is well timed since it covers the physics of the LHC, the LHC has just started colliding beams to achieve the unprecedented total centre of mass energy of 13TeV. After the discovery of the Higgs we are hoping that the opening up of this new threshold will allow discoveries that will shed light on the mysteries of the Higgs and provide clues about dark matter. The other major topic of the LIA is the study of the quark gluon plasma which intimately should provide clues about how matter forms in extreme conditions.

The LIA is structured around 4 nodes in each country. Participating laboratories represent the leading theory groups in both country with a high visibility internationally. The French laboratories are LAPTh, LPSC Grenoble, IPN Lyon, LPT Orsay, CPhT (Ecole Polytechnique) and IPhT CEA Saclay. On the Indian part beside IISc we have TIFR Mumbai, SINP/IACS/IISER Kolkata, IMSc Chennai and HRI Allahabad. The LIA IFTHEP (Indo French Theory High Energy Physics) , will run for an initial period of 4 years.

 

Refined background calculations for AMS02

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Les derniers résultats de l'expérience AMS-02 ont été annoncés à la mi-avril au CERN. Ce sont les mesures les plus précises à ce jour concernant les flux de protons, d'hélium et le rapport antiproton à proton, prolongeant en même temps la gamme/portée d'énergie de l'expérience PAMELA. Les résultats les plus attendus concernaient la production de l'anti-matière, en particulier la mesure des anti-protons puisque cette dernière peut être produite par la destruction de particules de matière noire qui constitue donc une source primaire. La production conventionnelle du Modèle Standard des anti-protons est menée par les collisions de rayons cosmiques de haute énergie avec la matière interstellaire. Ce mécanisme est donc un mécanisme de production secondaire qui constitue une base importante pour le signal d'une nouvelle physique grâce à la découverte de la matière noire. Les estimations précédentes de cette expérience prédisaient une forte baisse à haute énergie (des centaines de GeV) du rapport antiproton à proton.

Lire la suite : Refined background calculations for AMS02

   

The UGA Idex project pre-selected

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 Université de l’innovation

An important hurdle has been crossed on the way to achieve the goal of establishing the UGA, Université Grenoble Alpes, as a world class research and innovation university. The UGA is a conglomerate of universities and research institutions with a   multi-disciplinary training programme in Grenoble and in the Alps region. The French Ministry of Education and Research has announced that the Idex (Excellence Initiative) pre-project of UGA is one out of three pre-projects that has been selected among 7 other applications. This paves the way to the submission of the full project which will be reviewed by an international panel whose results will be made public in January 2016. In case of success this date will mark a new beginning for the new institution and will be a major boon for all the laboratories involved. For LAPTh this will reinforce our contribution to the Excellence Laboratory Initiative (Labex) Enigmass and build upon  our efforts in building a strong collaboration with the Grenoble laboratories. 

More details on the UGA Idex project can be found here (in French).

The project stands on excellent scientific foundations. For example, 1 out of  5 inhabitants in the Grenoble Alpes region are, in one way or the other, involved with research and innovation, see this short clip .

 

Lectures on Amplitudes and Symbols

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With the advent of the LHC and the need for ever increasing accuracy, techniques in loops calculations have witnessed tremendous progress borrowing from highly complex mathematical structures and improving and adapting these structures. A very recent development concerns  the use of symbols. Giorgios Papathanasiou will introduce some of  these concepts starting from an elementary exposition of how these objects appear from the integrals one encounters in the evaluation of scattering amplitudes beyond tree-level. There will be 4 lectures:

1: Analytic structure of scattering amplitudes and Feynman integrals. Algebraic and transcendental functions. Classical polylogarithms.

2: Multiple polylogarithms (MPL): Integral and Series representations. Shuffle and quasi-shuffle algebras.

3: The symbol map. Properties. Integrability condition. Application: Resolving identities among MPLs and simplifying expressions.

4: (Optional) Advanced topics: The Hopf algebra of MPLs and the coproduct. Bootstrapping amplitudes. Expanding the symbol.

   

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