Studies of the spin, parity and tensor couplings of the Higgs boson in the , and decay processes at the LHC are presented. The investigations are based on of pp collision data collected by the ATLAS experiment at  TeV and  TeV. The Standard Model (SM) Higgs boson hypothesis, corresponding to the quantum numbers , is tested against several alternative spin scenarios, including non-SM spin-0 and spin-2 models with universal and non-universal couplings to fermions and vector bosons. All tested alternative models are excluded in favour of the SM Higgs boson hypothesis at more than 99.9 % confidence level. Using the and decays, the tensor structure of the interaction between the spin-0 boson and the SM vector bosons is also investigated. The observed distributions of variables sensitive to the non-SM tensor couplings are compatible with the SM predictions and constraints on the non-SM couplings are derived.

This paper reviews and extends searches for the direct pair production of the scalar supersymmetric partners of the top and bottom quarks in proton–proton collisions collected by the ATLAS collaboration during the LHC Run 1. Most of the analyses use 20 of collisions at a centre-of-mass energy of TeV, although in some case an additional of collision data at TeV are used. New analyses are introduced to improve the sensitivity to specific regions of the model parameter space. Since no evidence of third-generation squarks is found, exclusion limits are derived by combining several analyses and are presented in both a simplified model framework, assuming simple decay chains, as well as within the context of more elaborate phenomenological supersymmetric models.

A search is presented for a high-mass Higgs boson in the , , , and decay modes using the ATLAS detector at the CERN Large Hadron Collider. The search uses proton–proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb. The results of the search are interpreted in the scenario of a heavy Higgs boson with a width that is small compared with the experimental mass resolution. The Higgs boson mass range considered extends up to for all four decay modes and down to as low as 140 , depending on the decay mode. No significant excess of events over the Standard Model prediction is found. A simultaneous fit to the four decay modes yields upper limits on the production cross-section of a heavy Higgs boson times the branching ratio to  boson pairs. 95 % confidence level upper limits range from 0.53 pb at  GeV to 0.008 pb at  GeV for the gluon-fusion production mode and from 0.31 pb at  GeV to 0.009 pb at  GeV for the vector-boson-fusion production mode. The results are also interpreted in the context of Type-I and Type-II two-Higgs-doublet models.

A 8 O, excited by 800-MeV/c kaons in the (K" 9 n~) reaction, have been observed at the Brookhaven alternating-gradient synchrotron. Data were recorded for scattering angles from 0° to 25°, corresponding to momentum transfers from 50 to 330 MeV/c. The levels are interpreted in terms of a A hyperon coupled to a strangeness-zero nuclear core. The results provide insights into the properties of the A-nucleon and A-nucleus interactions.

y-ray transitions of energy 2.034 ±0.023 MeV in the hypernucleus \ Li and 3.079 ±0.040 MeV in the hypernucleus ^Be are observed. In both cases, the energy of the y ray in the hypernucleus \z is very close to the energy of the first excited state of the nuclear core. The y rays are interpreted as arising from core transitions in the presence of the A particle. The size of the shift places limits on the strength of the AN spindependent interaction.