1,099 research outputs found
Results on QCD jet production at the LHC (incl. Heavy flavours)
No full textTalk slides for Recontres du Vietna
Performance of jet reconstruction and calibration in first ATLAS data at a centre-of-mass energy 7 TeV
No full textTalk at PLHC about Jet Reconstruction and Jet Calibratio
Results on QCD jet production at the LHC (including Heavy flavours)
No full textThese proceedings present results on QCD jet production at the LHC, including heavy flavours. These include recently published measurements of the ATLAS and CMS collaborations of jet cross sections, determinations of and heavy flavours
Planungsorganisation: Die Diskussion um die Reform von Regierung und Verwaltung des Bundes
No full textVorwort I. Auf der Suche nach neuen Problemlösungsstrategien: Die Entwicklung der politischen Planung auf Bundesebene Heribert Schatz II. Fallstudien zu Entscheidungsprozessen in der Bundesregierung Fritz W. Scharpf III. Thesen zur Steuerungsfunktion von Zielstrukturen Renate Mayntz IV. Probleme der inneren Kontrolle in der planenden Verwaltung Renate Mayntz V. Koordinationsplanung und Zielplanung Fritz W. Scharpf VI. Kriterien, Voraussetzungen und Einschränkungen aktiver Politik Renate Mayntz und Fritz W. Scharpf VII. Thesen zur mehrjährigen Finanzplanung des Bundes Frieder Naschold, Dietrich Seuster, Werner Väth und Oskar Zipfel VIII. Überlegungen zur Reorganisation der politischen Planung auf der Ebene des Regierungschefs und der Ministerien Adolf Theis IX. Vorschläge zur Reform der Ministerialorganisation Renate Mayntz und Fritz W. Scharpf Anmerkunge
Search for R-parity violating decays of sfermions at LEP
No full textA search for pair-produced scalar fermions under the assumption that R-parity is not conserved has been performed using data collected with the OPAL detector at LEP. The data samples analysed correspond to an integrated luminosity of about 610 pb-1 collected at centre-of-mass energies of sqrt(s) 189-209 GeV. An important consequence of R-parity violation is that the lightest supersymmetric particle is expected to be unstable. Searches of R-parity violating decays of charged sleptons, sneutrinos and squarks have been performed under the assumptions that the lightest supersymmetric particle decays promptly and that only one of the R-parity violating couplings is dominant for each of the decay modes considered. Such processes would yield final states consisting of leptons, jets, or both with or without missing energy. No significant single-like excess of events has been observed with respect to the Standard Model expectations. Limits on the production cross- section of scalar fermions in R-parity violating scenarios are obtained. Constraints on the supersymmetric particle masses are also presented in an R-parity violating framework analogous to the Constrained Minimal Supersymmetric Standard Model.A search for pair-produced scalar fermions under the assumption that R-parity is not conserved has been performed using data collected with the OPAL detector at LEP. The data samples analysed correspond to an integrated luminosity of about 610 pb-1 collected at centre-of-mass energies of sqrt(s) 189-209 GeV. An important consequence of R-parity violation is that the lightest supersymmetric particle is expected to be unstable. Searches of R-parity violating decays of charged sleptons, sneutrinos and squarks have been performed under the assumptions that the lightest supersymmetric particle decays promptly and that only one of the R-parity violating couplings is dominant for each of the decay modes considered. Such processes would yield final states consisting of leptons, jets, or both with or without missing energy. No significant single-like excess of events has been observed with respect to the Standard Model expectations. Limits on the production cross- section of scalar fermions in R-parity violating scenarios are obtained. Constraints on the supersymmetric particle masses are also presented in an R-parity violating framework analogous to the Constrained Minimal Supersymmetric Standard Model
Search for R-parity-violating supersymmetry in events with four or more leptons in root s=7 TeV pp collisions with the ATLAS detector
No full textATLAS Contributors: Paul Douglas Jackson and Nitesh Soni of School of Chemistry and Physics, University of Adelaide, Adelaide, Australia. Extent: 36p.A search for new phenomena in final states with four or more leptons (electrons or muons) is presented. The analysis is based on 4.7 fb⁻¹ of √s=7TeV proton-proton collisions delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in two signal regions: one that requires moderate values of missing transverse momentum and another that requires large effective mass. The results are interpreted in a simplified model of R-parity-violating supersymmetry in which a 95% CL exclusion region is set for charged wino masses up to 540 GeV. In an R-parity-violating MSUGRA/CMSSM model, values of m₁₍₂ up to 820 GeV are excluded for 10 < tan β < 40.The ATLAS collaboratio
Optimizing ATLAS code with different profilers
No full textAfter the current maintenance period, the LHC will provide higher\nenergy collisions with increased luminosity. In order to keep up with\nthese higher rates, ATLAS software needs to speed up\nsubstantially. However, ATLAS code is composed of approximately 6M\nlines, written by many different programmers with different\nbackgrounds, which makes code optimisation a challenge. To help with\nthis effort different profiling tools and techniques are being\nused. These include well known tools, such as the Valgrind suite and\nIntel Amplifier; less common tools like Pin, PAPI, and GOoDA; as well\nas techniques such as library interposing. In this paper we will\nmainly focus on Pin tools and GOoDA. Pin is a dynamic binary\ninstrumentation tool which can obtain statistics such as call counts,\ninstruction counts and interrogate functions' arguments. It has been\nused to obtain CLHEP Matrix profiles, operations and vector sizes for\nlinear algebra calculations which has provided the insight necessary\nto achieve significant performance improvements. Complimenting this,\nGOoDA, an in-house performance tool built in collaboration with\nGoogle, which is based on hardware performance monitoring unit events,\nis used to identify hot-spots in the code for different types of\nhardware limitations, such as CPU resources, caches, or memory\nbandwidth. GOoDA has been used in improvement of the performance of\nnew magnetic field code and identification of potential vectorization\ntargets in several places, such as Runge-Kutta propagation code
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