Ce séminaire présentera le Centre de Calcul de l’IN2P3 et les services informatiques qu’il propose aux personnels IN2P3. Après un aperçu des missions fondamentales du Centre de Calcul et du rôle qu'il joue aujourd'hui aux niveaux national et international, nous décrirons plus précisément son offre de service. Cette offre répondant aux besoins scientifiques quotidiens de stocker des données, les traiter, partager la connaissance, travailler en collaboration etc., ce séminaire s'adresse à tous les acteurs de la recherche de votre unité. Nous terminerons la présentation par une session de discussion avec laquelle nous pourrons aller plus en profondeur sur certains aspects et recenser vos besoins.
 

In the Standard Model, Yukawa-like interactions are short-range interactions between the fermions and the Higgs boson. Even though these interactions have important macroscopic consequences, only a subset of them could be observed directly and their origin remains unclear. At the LHC, the top and the b-quark are very sensitive probes for particles with Yukawa-like interactions, due to their large mass. This includes Higgs bosons, but also new scalar particles predicted by theories beyond the standard model and connected to the dark sector. By virtue of the t→bW branching ratio being close to 100%, both b- and top quarks are inferred by the presence of hadronic jets initiated by b-quarks, called b-jets, in the final state. I will introduce b-jet identification at the LHC and demonstrate its crucial role to study the coupling of the Higgs boson to third-generation fermions and probe the dark sector. I will highlight the importance of b-jet identification for the future steps of the LHC physics program and discuss the main experimental challenges.

Next few decades will be extremely exciting in Astronomy. New telescopes will enter in operation on Earth and in space; at the same time a new generation of Gravitational Wave detectors will be so powerful that they will detect the merging of black-holes binaries in the whole visible universe, up to a redshift of one hundred. Studying high energy events with a true Multi-Messenger Astronomy will give us a fantastic opportunity to discover new objects and new physics.

After a short introduction on the science case for a new generation of GW detectors, the presentation will be focused on the many challenges that scientists need to face to reduce the internal noise of the interferometers by a factor 10 with respect the current generation of instruments. Both the collaborations of Virgo and LIGO have prepared conceptual design and design studies that are attracting new scientists every day.

In Europe a collaboration has started to be formed around the project called Einstein Telescope. Details will be given on this observatory made of several interferometers working at cryogenic as well as at room temperatures. The CNRS is already involved in the whole field of GW but many scientists in France can find opportunities in this new field, applying their expertise on the detector development as well as on data analysis or astrophysics.

Quantum Computing - an introduction for computing scientists

Performing computing and solving problems using the quantum behaviour of the 
systems is an old dream. For example, the exponential complexity of the 
many-body problems needs exponentially increasing computing resources, but 
becomes linear when using registers of qubits (which can be manipulated 
synchronously through unitary operators). Beyond specific situations related 
to solving problems in quantum mechanics, the idea appeared that it could be 
possible to perform generic computing (beginning with the elementary 
operations) and move forward from the "classical" computers we have been using 
those last decades. 

The seminar addresses the aspects of the programming paradigm related to 
the quantum computing, since there is an increasing interest from the 
community of computing scientists, programmers and administrators. At the same, 
time, there is a legitimate preoccupation regarding the evolution of those 
professions, in particular at IN2P3 and a desire to join the (theoretical) 
research effort expressed clearly at the level of the European Community.

Séminaire conjoint CPPM-CPT

Actual meeting at LPNHE Paris

Agenda: https://indico.in2p3.fr/event/20221/