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ATLAS measurements of the azimuthal aniso-tropy in lead–lead collisions at √ s NN = 2.76 TeV are shown using a dataset of approximately 7 µb −1 collected at the LHC in 2010. The measurements are performed for charged particles with transverse momenta 0.5 < p T < 20 GeV and in the pseudorapidity range |η| < 2.5. The anisotropy is characterized by the Fourier(More)
A measurement of the calorimeter response to isolated charged hadrons in the ATLAS detector at the LHC is presented. This measurement is performed with 3.2 nb[Formula: see text] of proton-proton collision data at [Formula: see text] [Formula: see text] from 2010 and 0.1 nb[Formula: see text] of data at [Formula: see text] [Formula: see text] from 2012. A(More)
A test of CP invariance in Higgs boson production via vector-boson fusion using the method of the Optimal Observable is presented. The analysis exploits the decay mode of the Higgs boson into a pair of [Formula: see text] leptons and is based on 20.3 [Formula: see text] of proton-proton collision data at [Formula: see text] = 8 [Formula: see text] collected(More)
The luminosity determination for the ATLAS detector at the LHC during pp collisions at √ s = 8 TeV in 2012 is presented. The evaluation of the luminosity scale is performed using several luminometers, and comparisons between these luminosity detectors are made to assess the accuracy, consistency and long-term stability of the results. A luminosity(More)
The result of a search for pair production of the supersymmetric partner of the Standard Model bottom quark (˜ b 1) is reported. The search uses 3.2 fb −1 of pp collisions at √ s = 13 TeV collected by the ATLAS experiment at the Large Hadron Collider in 2015. Bottom squarks are searched for in events containing large missing transverse momentum and exactly(More)
This paper reports a detailed study of techniques for identifying boosted, hadronically decaying W bosons using 20.3 fb −1 of proton–proton collision data collected by the ATLAS detector at the LHC at a centre-of-mass energy √ s = 8 TeV. A range of techniques for optimising the signal jet mass resolution are combined with various jet sub-structure(More)
The algorithms used by the ATLAS Collaboration to reconstruct and identify prompt photons are described. Measurements of the photon identification efficiencies are reported, using 4.9 fb[Formula: see text] of pp collision data collected at the LHC at [Formula: see text] [Formula: see text] and 20.3 fb[Formula: see text] at [Formula: see text] [Formula: see(More)
Studies of the spin and parity quantum numbers of the Higgs boson in the W W * → eνμν final state are presented , based on proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb −1 at a centre-of-mass energy of √ s = 8 TeV. The Standard Model spin-parity J C P = 0 ++(More)
A search for the production of single-top-quarks in association with missing energy is performed in proton– proton collisions at a centre-of-mass energy of √ s = 8 TeV with the ATLAS experiment at the large hadron collider using data collected in 2012, corresponding to an integrated lumi-nosity of 20.3 fb −1. In this search, the W boson from the top quark(More)