932 research outputs found
Other BSM Searches at the LHC
No full textThe considerable center-of-mass energy and luminosity provided by the Large Hadron Collider (LHC) will ensure a discovery reach for new particles which extends well into the multi-TeV region. ATLAS and CMS have carried out many studies of the implications of this capability for Beyond the Standard Model physics. In this paper, we summarize the results of studies involving, leptons and jets with and without missing transverse energy in the final state. We will mainly focus on the potential for discovery and limits setting with an integrated luminosity of the order of 100 to 200 pb-1 per experiment
Search for Extra Dimensions With ATLAS at LHC
No full textTheories with extra space time dimensions aiming at resolving the hierarchy problem have recently been developed. These scenarios have provided exciting new grounds for experimental probes. A review of the studies done by the ATLAS collaboration on the sensitivity of the detector to various extra dimension models is reported in this documen
Electron/Photon Reconstruction Performance with the ATLAS Detector
No full textThe calibration of electromagnetic clusters is one of the key issues of ATLAS (and the LHC) in 2007. The cluster algorithm starting from electronically calibrated calorimeter cells will be described. Local position and local energy variations are corrected for. As a last step, longitudinal weights are applied to correct for energy loss upstream of the calorimeter. Strongly influenced by testbeam studies, the new longitudinal weighting optimizes simultaneously energy resolution and linearity. Methods to derive the final calibration parameters from the physics events have been developed. The electron and photon identification methods and their performance will then be discussed
Other Exotic Scenarios at the LHC
No full textThe considerable center-of-mass energy and luminosity at the LHC will ensure a discovery reach for new particles which extends well into the mlti-TeV region. ATLAS and CMS carried out many studies of the implications of this capability for Beyond the Standard Model Physics. In this talk, I will focus on studies involving extra-dimensions, little higgs, strong symmetry breaking, compositeness and new gauge bosons
Electrons/Photons Reconstruction with the ATLAS Detector
No full textThe calibration of electromagnetic clusters is one of the key issues of ATLAS (and the LHC) in 2007. The cluster alogrithm starting from electronically calibrated calorimeter cells will be described. Local position and local energy variations are corrected for. As a last step, longitudinal weights are applied to correct for energy loss upstream of the calorimeter. Strongly influenced by testbeam studies, the new longitudinal weighting optimizes simultaneously energy resolution and linearity. Methods to derive the final calibration parameters from the physics events have been developped. The electron and photon identification methods (cuts and multivariate analyses) and their performance will then be discussed
Translation and Trauma
No full textInternational audiencePolitical and social violence can have destructive effects not only on individual subjects but also on their descendants. How can one construct oneself in the presence of a silent traumatic heritage? Can such trauma be symbolized and translated, and if so, how can this be accomplished? The study of the life path of Janine Altounian, the author of several works on the effect of violence transmitted across the generations, and herself a descendant of parents who escaped the Armenian genocide, shows us a subjective attempt to translate one such traumatic heritage. More generally, clinical work with refugees allows us to think about the use of translation in the cases of individuals whose subjective foundations have been severely damaged by the trials of the real.Les violences politiques et sociales ont le pouvoir d’engendrer des effets destructeurs sur le sujet mais, au-delà, sur sa descendance. Comment peut-on se construire lorsqu’on hérite de silences traumatiques ? Existe-t-il des possibilités de symbolisation et de traductions de ces traumatismes ? Et si oui, de quelle manière peuvent-elles s’instaurer ? L’étude de la trajectoire de Janine Altounian, auteur de plusieurs ouvrages sur les effets de ces violences transmises entre générations et elle-même descendante de parents rescapés du génocide arménien, rend compte des tentatives subjectives de traduction d’un héritage traumatique. Plus généralement, la clinique des réfugiés permettra d’envisager le déploiement de la traduction, à l’œuvre chez ceux dont les assises subjectives ont été profondément mises à mal par l’épreuve du réel
Improving network performances by integrating erasure coding and game theory techniques in random access protocols
No full textThis research focuses on network performance and how to solve the problem of low throughput in the Aloha Medium Access Control (MAC) protocol and its derivatives. For this purpose, we propose two complementary solutions. The first consists of the integration of the erasure coding scheme in this protocol to recover collided packets and to reduce the rate of collision between transmitted packets. Here, since each node sends N coded packets instead of the k original packets, we have (N-k) redundant packets. The introduction of redundancy and subsequently structuring it in an exploitable manner, allows serious errors injected by the channel to be corrected. However, if each node attempts to achieve its best output without regard for the other nodes' actions, this could affect overall system throughput. To analyze such conflicting situations where the action of one node has an impact on the other nodes' actions, we add a complementary solution, which is based on the game theory technique of acquiring network equilibrium. This makes the network stronger and able to resist many collisions.</p
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