We present the first results on electroweak physics obtained by the ATLAS experiment at the CERN Large Hadron Collider (LHC), using p− p collisions at a centre-of-mass energy of 7 TeV. The observation of the W and Z electroweak bosons in leptonic decays and the first measurements of their production cross-section at √s = 7 TeV represent one of the most important benchmarks of the first stage of data-taking at the LHC and provide a first confirmation of the Standard Model (SM) predictions. Furthermore they are an important candle to understand and calibrate the ATLAS detector with early data. We describe the experimental techniques, issues and the measurement results, together with a comparison with SM expectations, using up to 225 nb−1 of integrated luminosity. A first look at theW and Z production as a function of the number of accompanying jets is also provided. Finally, a first search for t¯t production and a comparison of the identified candidates with the expected kinematic distributions from simulation is described.
Salamanna, G. (2010). ATLAS Electroweak results. In The XIXth International Workshop on High Energy Physics and Quantum Field Theory.
ATLAS Electroweak results
SALAMANNA, GIUSEPPE
2010-01-01
Abstract
We present the first results on electroweak physics obtained by the ATLAS experiment at the CERN Large Hadron Collider (LHC), using p− p collisions at a centre-of-mass energy of 7 TeV. The observation of the W and Z electroweak bosons in leptonic decays and the first measurements of their production cross-section at √s = 7 TeV represent one of the most important benchmarks of the first stage of data-taking at the LHC and provide a first confirmation of the Standard Model (SM) predictions. Furthermore they are an important candle to understand and calibrate the ATLAS detector with early data. We describe the experimental techniques, issues and the measurement results, together with a comparison with SM expectations, using up to 225 nb−1 of integrated luminosity. A first look at theW and Z production as a function of the number of accompanying jets is also provided. Finally, a first search for t¯t production and a comparison of the identified candidates with the expected kinematic distributions from simulation is described.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
