Abstract
During the first extended shutdown of the LHC, in 2013 and 2014, the ATLAS detector has undergone several improvements. A new silicon pixel detector layer has been added inside of the existing layers, enhancing vertex identification, while the coverage of the muon detector has been significantly expanded. Many other detector systems have been upgraded to handle the higher expected pileup conditions in the coming years and to generally improve their performance. This document describes these upgrades and the resulting impact on the reconstruction and performance of standard physics objects. Preliminary results using the first [Formula: see text] of 2015 data at [Formula: see text] Tev are presented, demonstrating the capability of ATLAS to perform both searches and measurements.
Highlights
The LHC1 has resumed operations after the completion of t√he first long shutdown
The collision energy of the LHC has been increased to s = 13 TeV and the machine is preparing to deliver higher instantaneous luminosity and higher pileup conditions to the experiments in the near future
The ability of the ATLAS Collaboration to perform physics depends on: (i) The performance of the LHC (ii) The functionality and coverage of the ATLAS detector (iii) The capability of the trigger to record interesting events (iv) The robustness of the object reconstruction and performance (v) The techniques used in the physics searches or measurements
Summary
The LHC1 has resumed operations after the completion of t√he first long shutdown. The ATLAS Experiment[2] has made use of the long shutdown to upgrade many detector systems, both to generally improve performance and to handle the higher expected pileup conditions. The close proximity of the IBL to the collision point significantly improves the vertex reconstruction precision and tracking performance. This is an Open Access article published by World Scientific Publishing Company. (i) The performance of the LHC (beam energy, luminosity, bunch spacing, etc) (ii) The functionality and coverage of the ATLAS detector (iii) The capability of the trigger to record interesting events (iv) The robustness of the object reconstruction and performance (v) The techniques used in the physics searches or measurements. Physics results using the first ∼ 80 pb−1 of 2015 data are presented, demonstrating the capability of ATLAS to perform both searches and measurements
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