We update the analysis of the pair production of electroweak gauge bosons
taking into account not only the dimension-six operators contributing
to triple gauge boson couplings, but also the modifications to the
couplings of gauge bosons to fermions. We quantify the effect on the LHC bounds on "bosonic" operator coefficients allowed within the present constraints of EWPD on the "fermionic"...
Measurements of the cross sections of the production of two and three 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 measurements of integrated and differential cross sections of the production of heavy di-boson...
Vector bosons are readily produced in the pp collisions at the LHC. Measurements of vector boson production cross sections is an important aspect of the ATLAS physics program and deviations of these measurements from the standard model predictions can be used to search for new physics. A selection of Run 2 results with $\sqrt{s} = 13\ \mathrm{TeV}$ data will be presented.
As part of its ongoing exploration into the nature of the particles produced in high energy proton-proton collisions, the ATLAS detector has been used to perform a number of new precision electroweak measurements. In this talk the recent measurements of the W-boson mass, the Drell-Yan triple-differential cross-section and the polarisation of tau leptons in Z/γ* → ττ decays will be discussed.
The study of the associated production of vector bosons and jets constitutes an excellent testbench to check numerous QCD predictions. Total and differential cross sections of vector bosons produced in association with jets has been studied at both 8 and 13 TeV center-of-mass energies. Differential distributions as function of a broad range of kinematical observables are measured and compared...
High precision data of lepton angular distributions for $\gamma^*/Z$ production in $p-p$ collision at LHC, covering broad ranges of dilepton's transverse momentum ($q_T$) and rapidity were reported recently. Strong $q_T$ dependencies were observed for several angular distribution coefficients, $A_i$, including $A_0 - A_4$. Significant rapidity dependencies were also found for the coefficients...
Minimal Universal Extra Dimensions (mUED) is an attractive model for physics beyond the Standard Model. It can however only be used as an effective theory valid up to an a priori unknown cutoff scale at which some UV completion takes over.
It is illuminating for that framework to quantify the sensitivity of observables to variations of the cutoff scale - we therefore compare the one loop QCD...
We introduce a new jet clustering algorithm (SIFT: Scale-Invariant Filter Tree), which does not impose a fixed cone size or associated scale on the event. The proposed construction maintains excellent object discrimination for very collimated partonic systems, while asymptotically recovering favorable behaviors of the standard anti-KT algorithm. It is intrinsically suitable (without secondary...
