ATLASTIER3 · Preparation for ATLAS data analysis in a TIER3 facility
FP6 — Marie Curie Actions (Human Resources and Mobility)
- Duration
- 2007-04-01 → 2008-03-31
- EU contribution
- €40,000
- Participants
- 1
- Scheme
- ERG
Lines connect the coordinator with its partners.
Results in brief
Final Activity Report Summary - ATLASTIER3 (Preparation for ATLAS data analysis in a TIER3 facility)
In the ATLAS computing model the tiered hierarchy ranged from the Tier-0 (CERN) down to desktops or workstations (Tier-3). The focus on defining the roles of each tiered component has evolved with the initial emphasis on the Tier-0 and Tier-1 definition and roles. The various 'Large hadron collider' (LHC) projects, including ATLAS, then evolved the tiered hierarchy to include Tier-2's (Regional centres) as part of their projects. Tier-3 centres, on the other hand, have been defined as whatever an institution could construct to support their Physics goals using institutional and otherwise leveraged resources and therefore have not been considered to be part of the official ATLAS computing resources. However, Tier-3 centres are going to exist and will have implications on how the computing model should support ATLAS physicists. Tier-3 users will want to access LHC data and simulations and will want to enable their resources to support their analysis and simulation work. This project has defined at Tier3 prototype at IFIC (Instituto de Física Corpuscular de Valencia), after discussing with the ATLAS Tier-3 task force, which is coherent with the ATLAS computing. In this project a computing facility has been developed for the ATLAS data analysis (TIER3) and the ATLAS software has been installed and maintained. Some analysis related with exotic resonances has been carried out at Institute using that infrastructure and shown to the ATLAS Physics and Computing communities.
Data: CORDIS, © European Union
Project objective
ATLAS is one of the two major experiments presently under construction at the LHC accelerator of CERN. ATLAS is also a basic key project in the scientific program of CERN, the European Laboratory for Particle Physics located in Geneva. Relevant topics for the project concern t-quark physics and search for new particles. Top quark is the heaviest of known fermions and its properties are important tests of the Standard Model. The LHC is an ideal place to study top physics since about 10 million events may be expected per year. Therefore a large sample of events is expected since the beginning of data taking and many new analyses become possible. As a comparison, the existing t-quark samples from TEVATRON experiments consist of few thousand events. With the TEV ATRON data, the t-quark mass has been measured with 4 GeV error, whereas a 1 GeV error is expected at the LHC. But many new analyses are possible at the LHC: precise measurement of the cross-section, decay modes, and t-quark polarization. Discussions started in ATLAS around 2002 concerning computation requirements for the LHC experiment, with the conclusions that GRID technologies had to be adopted. The adopted hierarchy for GRID technologies at the LHC is: TIER0, TIER1, TIER2 and TIER3. A TIER3 is a computing centre with data analysis as mail goal. The research project proposed here implies the participation of the applicant in the ATLAS project, and specifically in TIER3. Joining IFIC-Valencia groups, which is already involved in the project, would allow me to immediately attack the installation of ATLAS software in the TIER3. Initially, I would participate actively in the regular maintenance of it and training for all physicists in the use of this software. Finally, the natural development of the project leads to the analysis phase, where I intend to play a major role. The main research line would be the study of resonance decays into t-anti t pairs.
Original text from CORDIS.
Participants
- CONSEJO SUPERIOR DE INVESTIGACIONES CIENTIFICAS · MADRIDCoordinatorSpain
Links
Data: CORDIS, © European Union