2,130 research outputs found
Measurement of the top-quark mass in all-jets events in pp collisions at = 7 TeV
No full textThe mass of the top quark is measured using a sample of candidate events with at least six jets in the final state. The sample is selected from data collected with the CMS detector in pp collisions at = 7 TeV in 2011 and corresponds to an integrated luminosity of 3.54 . The mass is reconstructed for each event employing a kinematic fit of the jets to a hypothesis. The top-quark mass is measured to be 173.49 0.69(stat.) 1.21(syst.) GeV. A combination with previously published measurements in other decay modes by CMS yields a mass of 173.54 0.33(stat.) 0.96(syst.) GeV
Grid computing at the D0 experiment
No full textInternational audienceD0 is a pioneer in grid computing for large scale production activities involving the handling of collider data samples. A data grid (SAM) has been used since the start of Tevatron Run II as the sole means of data transport (enabling local offsite analysis). The focus of the computational grid (SAM-grid) so far has been on production activities. Integration of SAM-Grid with other grids, like LCG and OSG are ongoing projects. All Monte Carlo data are produced off-site. In 2005 and 2007 large fractions of the Run IIa and Run IIb data sets respectively (1 billion events) were reprocessed using native SAM-Grid, LCG and OSG resources. The value of grid computing to the D0 experiment is conservatively estimated at roughly $4M/year. Evolution towards full grid computing and lessons learned from these activities will be discussed
SUSY searches at the tevatron collider
No full textD0Recent results of the SUSY searches at a center-of-mass energy of 1.96 TeV in RunII of the Tevatron collider experiments CDF and D\O are presented. Analyses are based on up to of data collected from June 2002 until September 2003. Direct searches of charginos, neutralinos, squarks and gluinos in mSUGRA and in mGMSB models are complemented by an indirect SUSY signal search in rare decays. Model dependent mass limits set here surpass those of RunI
Grid computing at the D0 experiment
No full textInternational audienceD0 is a pioneer in grid computing for large scale production activities involving the handling of collider data samples. A data grid (SAM) has been used since the start of Tevatron Run II as the sole means of data transport (enabling local offsite analysis). The focus of the computational grid (SAM-grid) so far has been on production activities. Integration of SAM-Grid with other grids, like LCG and OSG are ongoing projects. All Monte Carlo data are produced off-site. In 2005 and 2007 large fractions of the Run IIa and Run IIb data sets respectively (1 billion events) were reprocessed using native SAM-Grid, LCG and OSG resources. The value of grid computing to the D0 experiment is conservatively estimated at roughly $4M/year. Evolution towards full grid computing and lessons learned from these activities will be discussed
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