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Séminaires et conférences

par Francois Legrand - 1er février 2011

Aujourd'hui Lundi 11 Décembre 2017

  • Séminaire
    Amphi Charpak
    2017-12-11 à 14:00
    Few microseconds after the Big Bang, the Universe was in a quark-gluon plasma (QGP) state. In this extremely hot and strongly interacting state of matter, quarks and gluons are not bound to hadrons 
    anymore. The QGP can also be created and studied using high-energy colliders and heavy-ion (A-A) collisions such as what is done at the Large Hadron Collider (LHC). The formation of a QGP in heavy ion collisions and the collective/hydrodynamic expansion of the created medium are well established and reasonably well understood. In particular, looking at anisotropy of the final-state distribution of particles produced in A-A collisions, it is now established that the QGP behaves like a nearly perfect fluid with a shear viscosity close to the KSS bound. This state of nuclear matter was not expected to be produced in reactions involving smaller colliding systems, such as the proton-nucleus (p-A) and proton-proton (p-p) collisions. Nevertheless, a wealth of experimental evidence in recent years has suggested the presence of collective phenomena and a possible QGP medium being formed also in high-multiplicity p-A and p-p collisions. A detailed investigation is needed to establish the cause of the observed collective behavior and to determine if, indeed, a QGP medium is being created or if another mechanism is responsible. Over the past year, the CMS experiment at the LHC has recorded a large amount of Pb-Pb, p-Pb and p-p collisions, opening new opportunities in the understanding of collective phenomena in high-multiplicity hadronic final state. Upon reviewing the experimental data from the CMS experiment and confronting them with theoretical models, a unified paradigm in describing the observed collectivity accross all hadronic collision system is emerging. Potential future paths toward addressing key open questions, especially on collectivity in small colliding systems (p-A and p-p) and new opportunities to study emergent Quantum Chromodynamics phenomena under extreme conditions, will be discussed.

Prochainement

  • Réunion du vendredi
    Amphi LPNHE
    2017-12-15 à 11:00

    Francesco Crescioli - TBA

  • Séminaire
    2017-12-18 à 14:00

    Pyrame3 is the new version of the Pyrame framework, wich emphasizes on                                                                                    
        the online data treatment and the complex tasks scripting. A new                                                                                          
        mechanism has been implemented to allow any module to treat and publish                                                                                   
        data in real time. This data is made available to any requesting module                                                                                   
        through the Pyrame protocol. A circular buffer mechanism allows to break                                                                                  
        the real-time constraint and to serve the slower programs in a generic                                                                                    
        subsampling way. On the other side, a programming facility called                                                                                         
        event-loop has been provided in C/C++ language to ease the development                                                                                    
        of monitoring programs. Using this mechanism, the acquisition chain can                                                                                   
        now launch online decoders that makes available raw data plus some basic                                                                                  
        reconstruction data (true coordinate, true time, data quality tags...)                                                                                    
        to monitoring programs. With the event-loop, it is now really very easy                                                                                   
        to implement new online monitoring programs. On the other side, the                                                                                       
        scripting mechanism has been enhanced to provide complete control of the                                                                                  
        detector. The configuration module now handles every kind of hardware                                                                                     
        and an automatic system synchronizes running parameters with                                                                                              
        configuration. Combining this two new features, one can easily script                                                                                     
        and monitor complex behaviours like position or energy scanning,                                                                                          
        calibrations or data driven reconfigurations.                               

Planning des salles du LPNHE
Lundi 11 Décembre 2017

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