This paper presents a study of Formula omitted and Formula omitted triboson production using events from proton-proton collisions at a centre-of-mass energy of Formula omitted recorded with the ATLAS ...detector at the LHC and corresponding to an integrated luminosity of 20.2 fb Formula omitted. The Formula omitted production cross-section is determined using a final state containing an electron, a muon, a photon, and neutrinos ( Formula omitted). Upper limits on the production cross-section of the Formula omitted final state and the Formula omitted and Formula omitted final states containing an electron or a muon, two jets, a photon, and a neutrino ( Formula omitted or Formula omitted) are also derived. The results are compared to the cross-sections predicted by the Standard Model at next-to-leading order in the strong-coupling constant. In addition, upper limits on the production cross-sections are derived in a fiducial region optimised for a search for new physics beyond the Standard Model. The results are interpreted in the context of anomalous quartic gauge couplings using an effective field theory. Confidence intervals at 95% confidence level are derived for the 14 coupling coefficients to which Formula omitted and Formula omitted production are sensitive.
This paper presents a study of the production of WW or WZ boson pairs, with one W boson decaying to Formula omitted or Formula omitted and one W or Z boson decaying hadronically. The analysis uses ...Formula omitted of Formula omittedpp collision data, collected by the ATLAS detector at the Large Hadron Collider. Cross-sections for WW / WZ production are measured in high- Formula omitted fiducial regions defined close to the experimental event selection. The cross-section is measured for the case where the hadronically decaying boson is reconstructed as two resolved jets, and the case where it is reconstructed as a single jet. The transverse momentum distribution of the hadronically decaying boson is used to search for new physics. Observations are consistent with the Standard Model predictions, and 95% confidence intervals are calculated for parameters describing anomalous triple gauge-boson couplings.
The distributions of transverse momentum and longitudinal momentum fraction of charged particles in jets are measured in Pb+Pb and pp collisions with the ATLAS detector at the LHC. The distributions ...are measured as a function of jet transverse momentum and rapidity. The analysis utilises an integrated luminosity of 0.14 nb Formula omitted of Pb+Pb data and 4.0 pb Formula omitted of pp data collected in 2011 and 2013, respectively, at the same centre-of-mass energy of 2.76 TeV per colliding nucleon pair. The distributions measured in pp collisions are used as a reference for those measured in Pb+Pb collisions in order to evaluate the impact on the internal structure of jets from the jet energy loss of fast partons propagating through the hot, dense medium created in heavy-ion collisions. Modest but significant centrality-dependent modifications of fragmentation functions in Pb+Pb collisions with respect to those in pp collisions are seen. No significant dependence of modifications on jet Formula omitted and rapidity selections is observed except for the fragments with the highest transverse momenta for which some reduction of yields is observed for more forward jets.
High-precision measurements by the ATLAS Collaboration are presented of inclusive Formula omitted, Formula omitted and Formula omitted ( Formula omitted) Drell-Yan production cross sections at the ...LHC. The data were collected in proton-proton collisions at Formula omitted with an integrated luminosity of Formula omitted. Differential Formula omitted and Formula omitted cross sections are measured in a lepton pseudorapidity range Formula omitted. Differential Formula omitted cross sections are measured as a function of the absolute dilepton rapidity, for Formula omitted, for three intervals of dilepton mass, Formula omitted, extending from 46 to Formula omitted. The integrated and differential electron- and muon-channel cross sections are combined and compared to theoretical predictions using recent sets of parton distribution functions. The data, together with the final inclusive Formula omitted scattering cross-section data from H1 and ZEUS, are interpreted in a next-to-next-to-leading-order QCD analysis, and a new set of parton distribution functions, ATLAS-epWZ16, is obtained. The ratio of strange-to-light sea-quark densities in the proton is determined more accurately than in previous determinations based on collider data only, and is established to be close to unity in the sensitivity range of the data. A new measurement of the CKM matrix element Formula omitted is also provided.
![Study of [Formula omitted] ...](http://api.summon.serialssolutions.com/2.0.0/image/issn/XR4PS5YY4K/1434-6044/small "Study of [Formula omitted] and [Formula omitted] production in [Formula omitted] collisions at [Formula omitted] and search for anomalous quartic gauge couplings with the ATLAS experiment")
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