Conveners
LHC Run-2 Detector Performance
- Petra Merkel (Fermi National Accelerator Lab. (US))
- Anyes Taffard (University of California Irvine (US))
LHC Run-2 Detector Performance
- Anyes Taffard (University of California Irvine (US))
- Petra Merkel (Fermi National Accelerator Lab. (US))
LHC Run-2 Detector Performance
- Anyes Taffard (University of California Irvine (US))
- Petra Merkel (Fermi National Accelerator Lab. (US))
LHC Run-2 Detector Performance
- There are no conveners in this block
Petra Merkel
(Fermi National Accelerator Lab. (US))
8/4/15, 2:00 PM
LHC Run-2 Detector Performance
The CMS silicon tracker went through a series of improvements during the first LHC long shutdown to prepare for the LHC Run II challenge. The startup conditions at 13 TeV for both subdetectors will be summarised, including specifics for 50ns and 25ns operations and improvements in calibrations which were developed during 2013 and 2014. Early LHC Run II performance of the CMS Pixel and Strip...
Shih-Chieh Hsu
(University of Washington, Seattle)
8/4/15, 2:23 PM
LHC Run-2 Detector Performance
The Pixel Detector of the ATLAS experiment has shown excellent performance during the whole Run-1 of the Large Hadron Collider. Taking advantage of the long shutdown, the detector was extracted from the experiment and brought to surface, to repair modules and to ease installation of the Insertable B-Layer (IBL). The IBL is a fourth innermost layer of the pixel detector, and was installed in...
Heshy Roskes
(Johns Hopkins University (US))
8/4/15, 2:46 PM
LHC Run-2 Detector Performance
The all-silicon design of the tracking system of the CMS experiment provided excellent resolution for charged tracks and an efficient tagging of jets during Run1 of the LHC. As the CMS tracker, and in particular its pixel detector, underwent repairs and experienced changed conditions with the start of Run2 this year, the position and orientation of each of the 15148 silicon strip and 1440...
Espen Eie Bowen
(Universitaet Zuerich (CH))
8/4/15, 4:00 PM
LHC Run-2 Detector Performance
The LHCb detector consists of subsystems designed to perform high efficiency track reconstruction (> 95%) with an excellent momentum resolution (0.5% for p< 20 GeV). Two Ring Imaging Cherenkov detectors provide particle identification with a high precision.
In Run II of the LHC, a new scheme for the software trigger at LHCb allows splitting the triggering of the event in two stages, giving...
Kelly Marie Stifter
(University of Minnesota (US))
8/4/15, 4:23 PM
LHC Run-2 Detector Performance
A new Beam Halo Monitor (BHM) detector system has been installed in the CMS cavern to measure the machine-induced background (MIB) from the LHC. This background originates from interactions of the LHC beam halo with the final set of collimators before the CMS experiment and from beam gas interactions. The BHM detector uses the directional nature of Cherenkov radiation and event timing to...
Michael Ryan Clark
(Columbia University (US))
8/4/15, 4:46 PM
LHC Run-2 Detector Performance
Run-2 of the LHC will provide new challenges to track and vertex reconstruction with larger energies, denser jets and higher rates. We will discuss performance enhancements due to the Insertable B-layer (IBL), a fourth pixel layer which has been added to the innermost part of the ATLAS detector. We will also discuss improvements to the track reconstruction developed during the two year...
359.
The performance and development of the Inner Detector Trigger Algorithms at ATLAS for LHC Run 2
Benjamin Sowden
(Royal Holloway, University of London)
8/4/15, 5:09 PM
LHC Run-2 Detector Performance
A description of the design and performance of the newly reimplemented
tracking algorithms for the ATLAS trigger for LHC Run 2, to commence in
spring 2015, is provided. The ATLAS High Level Trigger (HLT) has been
restructured to run as a more flexible single stage process, rather than
the two separate Level 2 and Event Filter stages used during Run 1. To
make optimal use of this new...
Grant Riley
(University of Tennessee (US))
8/4/15, 5:32 PM
LHC Run-2 Detector Performance
The Pixel Luminosity Telescope (PLT) is one of the newest additions to the CMS detector at the LHC. It consists of 16 3-layer telescopes of silicon pixel detectors pointing toward the interaction point at the center of CMS. The pixel detectors are based on the same technology as the silicon pixel detector of CMS. The chips have an additional output, called a fast-out. This fast-out is sent...
Kevin Black
(Boston University)
8/5/15, 2:00 PM
LHC Run-2 Detector Performance
After its first shutdown, LHC will provide pp collisions with increased luminosity and energy. In the ATLAS experiment the Trigger and Data Acquisition (TDAQ) system has been upgraded to deal with the increased event rates.
The trigger system consists of a hardware Level-1 (L1) and a software based high-level
trigger (HLT) that reduces the event rate from the design bunch-crossing rate of...
Gabriella Pasztor
(Carleton University (CA))
8/5/15, 2:23 PM
LHC Run-2 Detector Performance
Electron and photon triggers covering transverse energies from 5 GeV to several TeV are essential for signal selection in a wide variety of ATLAS physics analyses to study Standard Model processes and to search for new phenomena. Final states including leptons and photons had, for example, an important role in the discovery and measurement of the Higgs particle. Dedicated triggers are also...
Andrea Massironi
(Northeastern University (US))
8/5/15, 2:46 PM
LHC Run-2 Detector Performance
The CMS electromagnetic calorimeter (ECAL) is a high-resolution, hermetic, and homogeneous calorimeter made of 75,848 scintillating lead tungstate crystals. After the successful quest for the Higgs boson, the CMS ECAL is at the forefront of precision measurements and the search for new physics in data from the LHC, which recently began producing collisions at the unprecedented energy of 13...
David Miller
(University of Chicago (US))
8/5/15, 3:09 PM
LHC Run-2 Detector Performance
The reconstruction of jets and missing transverse energy has proved to be of extreme importance in Run 1 of the LHC, and has great potential to uncover new physics with Run 2 data. ATLAS has implemented and commissioned several new techniques for the analysis and interpretation of hadronic final states at the LHC. These include event-by-event pile-up subtraction algorithms for jets and missing...
Sebastien Prince
(McGill University (CA))
8/5/15, 4:00 PM
LHC Run-2 Detector Performance
After the current shutdown, the LHC is about to resume operation for a
new data-taking period, when it will operate with increased
luminosity, event rate and centre of mass energy. The new conditions
will impose more demanding constraints on the ATLAS online trigger
reconstruction and selection system. To cope with such increased
constraints, the ATLAS High Level Trigger, placed after a...
John Alison
(University of Chicago (US))
8/5/15, 4:23 PM
LHC Run-2 Detector Performance
In high-energy physics experiments, online selection is crucial to select interesting collisions from the large data volume. ATLAS b-jet and tau triggers are designed to identify heavy-flavour content in real-time and provide the only option to efficiently record events with fully hadronic final states containing b-jets or hadronic tau decays. In doing so, two different, but related,...
Wells Wulsin
(Ohio State University (US))
8/5/15, 4:46 PM
LHC Run-2 Detector Performance
Since the end of LHC Run 1 in 2012, the readout electronics of the innermost ring of the CMS Cathode Strip Chambers (CSC) endcap muon detector have been upgraded to accommodate the larger luminosity and collision energy anticipated in Run 2. A major effort was required to design, install, and commission these new electronics. This talk will summarize the improvements made during this upgrade...
Dongliang Zhang
(University of Michigan (US))
8/5/15, 5:09 PM
LHC Run-2 Detector Performance
The ATLAS muon reconstruction has been improved for the Run-II of the LHC. In this presentation, we will discuss the new reconstruction algorithm and its performance as measured during the early run of the LHC in 2015 at sqrt(s)= 13 TeV using samples of J/ψ→μμ and Z→μμ decays. Reconstruction and identification efficiency, transverse momentum resolution and momentum scales are measured in the...
