The hadronic final state in electron-proton collisions at HERA has provided a rich testing
ground for development of the theory of the strong force, QCD. In this review, over 200 …

After the discovery of the top quark more than 20 years ago, its properties have been studied
in great detail both in production and in decay. Increasingly sophisticated experimental …

We adopt a fully gauge-invariant effective-field-theory approach for parametrizing top-quark
flavor-changing-neutral-current interactions. It allows for a global interpretation of …

Results of a search for new phenomena in events with at least three photons are reported.
Data from proton–proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an …

A bstract A search for flavour-changing neutral-current processes in top-quark decays is
presented. Data collected with the ATLAS detector from proton-proton collisions at the Large …

A bstract A search is performed for flavour-changing neutral currents in the decay of a top
quark to an up-type (c, u) quark and a Higgs boson, where the Higgs boson decays to two …

A search for the flavour-changing neutral-current decay t → qZ t→ q Z is presented. Data
collected by the ATLAS detector during 2012 from proton–proton collisions at the Large …

New physics in the rare top decays t→ q ℓ+ ℓ-is currently very weakly constrained. We show
that in a large class of Standard Model extensions, existing experimental constraints on new …

A search for the production of a top quark in association with a photon and additional jets via
flavor changing neutral current interactions is presented. The analysis uses proton-proton …

A search for single top-quark production via flavour-changing neutral current processes from
gluon plus up-or charm-quark initial states in proton–proton collisions at the LHC is …