Description
Including novel analysis techniques, trigger strategies, simulation tools, luminosity determination, etc
Ondrej Penc
(Acad. of Sciences of the Czech Rep. (CZ))
04/03/2015, 17:07
Michael Aaron Kagan
(SLAC National Accelerator Laboratory (US)),
Qi Zeng
(SLAC National Accelerator Laboratory (US))
04/03/2015, 17:12
Xavier Coubez
(Institut Pluridisciplinaire Hubert Curien PHC (FR))
04/03/2015, 17:15
Varvara Batozskaya
(National Centre for Nuclear Research (PL))
04/03/2015, 17:23
Tatiana Likhomanenko
(National Research Centre Kurchatov Institute (RU))
04/03/2015, 17:45
The main b-physics trigger algorithm used by the LHCb experiment is the so-called topological trigger. The topological trigger selects vertices which are a) detached from the primary proton-proton collision and b) compatible with coming from the decay of a b-hadron. In the LHC Run 1, this trigger utilized a custom boosted decision tree algorithm, selected an almost 100% pure sample of...
Silvio Donato
(Universita di Pisa & INFN (IT))
04/03/2015, 18:05
The LHC is expected to reach up to forty proton-proton collisions per bunch crossing at 13 TeV this year. In this high pile-up scenario, the rate of hadronic triggers is expected to be high. Soft jets originating from pile-up collisions may contribute to the multijet trigger rate and, in addition, they can produce fake missing transverse energy. At the CMS experiment, pile-up effects are...
Qidong ZHOU
(Nagoya University (JP))
04/03/2015, 18:06
LHCf will have an operation of √s=13TeV p-p collisions in May 2015. The operation is scheduled for 5 days with very low luminosity (1029 cm-2 s-1), collaborating with the ATLAS experiment. The common data acquisition with ATLAS gives central information to help LHCf identifying the diffractive events. We designed the trigger system on the LHCf side for the common operation. By using PYTHIA...
Ben Nachman
(SLAC National Accelerator Laboratory (US))
04/03/2015, 18:07
A review of recent developments on the performance of jet substructure with the ATLAS detector. Topics include jet mass calibrations and uncertainties, pileup mitigation using subjet pileup jet tagging, new substructure variables, and jet mass performance in high pileup conditions.
Alex Birnkraut
(Technische Universitaet Dortmund (DE)),
Ulrich Paul Eitschberger
(Technische Universitaet Dortmund (DE))
04/03/2015, 18:08
Measurements of flavour oscillations and time-dependent CP asymmetries in neutral B meson systems require knowledge of the b quark production flavour. This identification is performed by the Flavour Tagging.
Kirill Grevtsov
(Centre National de la Recherche Scientifique (FR))
04/03/2015, 18:18
This poster presents the electron and photon energy calibration achieved with the ATLAS detector using about 25 fb−1 of LHC proton–proton collision data taken at centre-of-mass energies of s√ = 7 and 8 TeV. The reconstruction of electron and photon energies is optimised using multivariate algorithms. The response of the calorimeter layers is equalised in data and simulation, and the...
Eric Drechsler
(Georg-August-Universitaet Goettingen (DE))
04/03/2015, 18:19
Hadronically decaying tau-leptons are important for Standard Model (SM), Higgs- and Beyond SM analyses and hence a key part of the ATLAS physics program. A correct understanding of the performance of the reconstruction and identification algorithms is a crucial part for any analysis involving tau-leptons.
Roland Jansky
(University of Innsbruck (AT))
04/03/2015, 18:20
Detailed understanding and optimal track reconstruction performance of ATLAS in the core of high pT objects is paramount for a number of techniques such as jet energy and mass calibration, jet flavour tagging, and hadronic tau identification as well as measurements of physics quantities like jet fragmentation functions. These dense environments are characterized by charged particle separations...
Danijela Bogavac
(University of Belgrade (RS))
04/03/2015, 18:21
In high-energy physics experiments, online selection is crucial to identify the few interesting collisions from the large data volume processed. In the overall ATLAS trigger strategy, b-jet triggers are designed to identify heavy-flavor content in real-time and, in particular, provide the only option to efficiently record events with fully hadronic final states containing b-jets. In doing so,...
Kurt Brendlinger
(University of Pennsylvania (US))
04/03/2015, 18:22
Bo Liu
(Academia Sinica (TW)/Shandong University(CN))
04/03/2015, 18:23
Aparajita Dattagupta
(Indiana University (US)),
Aparajita Dattagupta
(Indiana University (US))
04/03/2015, 18:24
Jets are collimated sprays of hadrons coming from the fragmentation of quarks and gluons. They are formed from topologically related energy deposits in calorimeter cells (topo-clusters). The input topo-clusters can be calibrated either at the electromagnetic scale (EM) or with the local cluster weighting scheme (LCW), which tries to correct for the differences between electromagnetic and...
