Direct real photons are arguably the most versatile tools to study relativistic heavy ion
collisions. They are produced, by various mechanisms, during the entire space-time history …

A search for the standard model Higgs boson is performed in the diphoton decay channel.
The data used correspond to an integrated luminosity of 4.9 fb-1 collected with the ATLAS …

A search is performed for top-quark pairs (tt¯) produced together with a photon (γ) with
transverse energy greater than 20 GeV using a sample of tt¯ candidate events in final states …

Prompt photon production in s NN= 2.76-TeV Pb+ Pb collisions has been measured by the
ATLAS experiment at the Large Hadron Collider using data collected in 2011 with an …

A measurement of the cross section for the production of an isolated photon in association
with jets in proton-proton collisions at a center-of-mass energy s= 7 TeV is presented …

A bstract We describe the calculation of the next-to-next-to-leading order (NNLO) QCD
corrections to isolated photon and photon-plus-jet production, and discuss how the …

A search is presented for massive long-lived particles decaying into a muon and two quarks.
The dataset consists of proton-proton interactions at centre-of-mass energies of 7 and 8 TeV …

Direct photon production in hadronic collisions provides a handle on the gluon PDF by
means of the QCD Compton scattering process. In this work we revisit the impact of direct …

The χ b (n P) quarkonium states are produced in proton-proton collisions at the Large
Hadron Collider at s= 7 TeV and recorded by the ATLAS detector. Using a data sample …

A search is presented for massive long-lived particles, in the 20–60 Ge V\!/c^ 2 Ge V/c 2
mass range with lifetimes between 5 and 100 ps ps. The dataset used corresponds to 0.62 …