The most recent results on the production of single W and Z bosons with two jets at high invariant mass at centre-of-mass energies of 7, 8 and 13 TeV are presented. Integrated and differential cross sections are measured in many different phase space regions with varying degree of sensitivity to the electroweak production in vector boson fusion. The cross section for the electroweak W boson...
The production of jets in association with vector bosons is an important process to study QCD in a multi-scale environment. The ATLAS collaboration has performed measurements of vector boson+jets cross sections, differential in several kinematic variables, in proton-proton collision data taken at center-of-mass energies of 8TeV and 13TeV. The measurements are compared to state-of-the art...
The production of prompt isolated photons at hadron colliders provides a stringent test of perturbative QCD and can be used to probe the gluon density function of the proton.
The ATLAS collaboration has performed precise measurements of the inclusive production of isolated prompt photons at a center-of-mass energy of 13 TeV, differential in both rapidity and the photon transverse momentum. In...
The production of jets at hadron colliders provides a stringent test of perturbative QCD at the highest energies. The process can also be used to probe the gluon density function of the proton. Specific topologies can be used to extract the strong coupling constant.
The ATLAS collaboration has recently measured the inclusive jet production cross section in data collected at a center-of-mass...
Measurements of the Drell-Yan production of W and Z/gamma bosons at the LHC provide a benchmark of our understanding of perturbative QCD and probe the proton structure in a unique way. The ATLAS collaboration has performed new high precision measurements at center-of-mass energies of 7. The measurements are performed for W+, W- and Z/gamma bosons integrated and as a function of the boson or...
Measurements of the Drell-Yan production of W and Z/gamma bosons at the LHC provide a benchmark of our understanding of perturbative QCD and probe the proton structure in a unique way. The ATLAS collaboration measured the di-lepton mass range up to the TeV scale as well as the triple differential cross-section measurement as a function of Mll, dilepton rapidity and cosθ defined in the...
To define precision observables in a way which is most suitable for interpretation
it is convenient to separate electroweak and QCD effects for pp collision processes@LHC. We argue, that for that purpose, choice of orientation of coordinates (in the rest frame of lepton pair) for Drell Yan processes can be beneficial to reduce entanglement of QCD and electroweak effects.
Numerical results...
In this talk, we describe the computation of higher-order QED effects relevant in hadronic collisions. We start with a brief discussion about the calculation of mixed QCD-QED one-loop contributions to the Altarelli-Parisi splittings functions. Then, we explain how to extend the DGLAP equations to deal with new parton distributions, emphasizing the consequences of the novel corrections in the...
In this talk we consider the back-to-back region of the
energy-energy correlation in $e^+e^-$ collisions and present the matching of
the next-to-next-to-leading logarithmic (NNLL) approximation with the recently
computed fixed next-to-next-to-leading order (NNLO) corrections. We perform the
matching in the log R scheme. We compare our results to precise LEP and SLC data,
and find that the...
We present our next-to-next-to-leading order result performed in the CoLoRFulNNLO subtraction scheme for the three jet rate in electron-positron annihilation into three jets using the exclusive kt clustering algorithm. Results matched with next-to-double logarithmic resummation are also shown compared to OPAL data. In addition we present our predictions using the anti-kt algorithm at...
Decreasing errors in experimental data obtained from colliders like the LHC
makes it necessary to invoke higher and higher orders in theory predictions.
A crucial part of the NNLO QCD predictions is the handling of the double real radiation phase-space and the cancellation of IR divergences with other contributions. I present a new phase-space parameterization for the sector-improved residue...
I will present a general method to account for full colour dependence Yang-Mills amplitudes at loop level. The method fits most naturally into the framework of multi-loop integrand reduction and in a nutshell amounts to consistently retaining the colour structures of the unitarity cuts from which the integrand is gradually constructed. I will discuss connections to loop-level Kleiss-Kuijf...
Vector boson scattering at the LHC has recently been discovered in the process $p p \to \mu^+\nu_\mu e^+\nu_e$, the so-called same-sign WW channel. This opens a new window for studying the nature of electroweak symmetry breaking and the role of the Higgs boson. Precision predictions for this process are thus of great importance. In this talk, the electroweak corrections at next-to-leading...
Measurements of the cross sections of the production of pairs of electroweak gauge bosons at the LHC constitute stringent tests of the electroweak sector of the Standard Model and provide a model-independent means to search for new physics at the TeV scale. The ATLAS collaboration has performed detailed measurements of integrated and differential cross sections of the production of heavy...
Searching for heavy vector bosons is one of the challenging objectives of the LHC: I will discuss two scenarios which have not been investigated yet by the experimental collaborations. The first scenario consists in searching for Z' bosons, predicted by U(1) GUT-inspired models, by investigating its possible BSM decays, namely supersymmetric decays, leading to resonant final states with...
