Observability of new phenomenological models in High Energy experiments is delicate to evaluate, due to the complexity of the related detectors, DAQ chain and software. Delphes is a new framework for fast simulation of a general purpose experiment. The simulation includes a tracking system, a magnetic field, calorimetry and a muon system, and possible very forward detectors arranged along the beamline. The framework is interfaced to standard file format from event generators and outputs observable analysis data objects. The simulation takes into account the detector resolutions, usual reconstruction algorithms for complex objects (FastJet) and a simplified trigger emulation. Detection of very forward scattered particles relies on the transport in beamlines with the Hector software. Finally, the FROG 2D/3D event display is used for visualisation of the collision final states.
External collaborators: Severine Ovyn, Xavier Rouby from pfease company.
Monte Carlo development. In collaboration with MadGraph and FeynRules teams and many external collaborators
External collaborators: Claude Duhr, Benjamin Fuks, Kentarou Mawatari, Kaoru Hagiwara, Tim Stelzer, Johan Alwall, Stefano Frixione, Roberto Pittau, Valentin Hirshi, Rikkert Frederix.
NA62 will look for rare kaon decays at SPS accelerator at CERN. A total of about $10^{12}$ kaon decays will be produced in two years of data taking. Even though the topology of the events is relatively simple, and the amount of information per event small, the volume of data to be stored per year will be of the order of 1000 TB. Also, an amount of 500 TB/year is expected from simulation. Profiting from the synergy inside CP3 in sharing computer resources our group is participating in the definition of the NA62 computing scheme. CP3 will be also one of the grid virtual organization of the experiment. Two computers models are now under study. One with a centralized on line farm close to the experiment, in which raw data storage and level3 filters will be done at CERN, and different centres belonging to virtual organization will be used for reprocessing, simulation and analysis. The other model is based in a distribution of raw data to few computing centres outside CERN, where data storage will be assured as well as the tasks mentioned before. In both cases CP3 will contribute in a significative way. Tests and simulations of both concepts will be performed during 2010. The scientific projects related to or directly integrated on the UCL computing cluster are the following: MadGraph/MadEvent, CMS-Tier2 and Cosmology.
External collaborators: INFN (Rome I), University of Birmingham.
The World LHC Computing GRID (WLCG) is the worldwide distributed computing infrastructure controlled by software middleware that allows a seamless usage of shared storage and computing resources. One PByte of data is expected to be produced every year by the CMS detector at the LHC collider. This data must be processed (iterative and refined calibration and analysis) by a large scientific community that is widely distributed geographically. Instead of concentrating all necessary computing resources in a single location, the LHC experiments have decided to set-up a network of computing centres distributed all over the world. The overall WLCG computing resources needed by CMS alone in 2010 amount to about 25,000 CPUs, 25,000 TB of disk storage and 35,000 TB of tape storage. Working in the context of the WLCG translates into seamless access to shared computing and storage resources. End users do not need to know where their applications run. The choice is made by the underlying WLCG software on the basis of availability of resources, demands of the user application (CPU, input and output data,..) and privileges owned by the user. Back in 2005 UCL proposed the WLCG Belgian Tier2 project that was endorsed by the 6 Belgian Universities involved in CMS. The Tier2 project consists of contributing to the set-up of the WLCG by building two computing centres, one at UCL and one at the IIHE (ULB/VUB). The UCL site of the WLCG Belgian Tier2 is deployed in a dedicated room close to the cyclotron control room of the IRMP Institute and is currently a fully functional component of the WLCG. The UCL Belgian Tier2 project also aims at integrating, bringing on the GRID and sharing resources with other scientific projects. The scientific projects related to or directly integrated on the UCL computing cluster are the following: MadGraph/MadEvent, NA62 and Cosmology.
External collaborators: CISM (UCL), Pascal Vanlaer (Belgium, ULB), Lyon computing centre, CERN computing centre.
