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Search for electroweak production of supersymmetric states in scenarios with co...
ATLAS collaboration (2857 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Araque, Juan Pedro; Castro, Nuno FilipeA search for electroweak production of supersymmetric particles in scenarios with compressed mass spectra in final states with two low-momentum leptons and missing transverse momentum is presented. This search uses proton-proton collision data recorded by the ATLAS detector at the Large Hadron Collider in 2015–2016, corresponding to 36.1 fb-1 of integrated luminosity at s=13 TeV. Events with same-flavor pairs...
Studies of $Z\gamma$ production in association with a high-mass dijet system in...
ATLAS collaboration (2857 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Carvalho, JoãoThe production of a Z boson and a photon in association with a high-mass dijet system is studied using 20.2 fb$^{−1}$ of proton-proton collision data at a centre-of-mass energy of $ \sqrt{s}=8 $ TeV recorded with the ATLAS detector in 2012 at the Large Hadron Collider. Final states with a photon and a Z boson decaying into a pair of either electrons, muons, or neutrinos are analysed. Electroweak and total pp → ...
Measurements of integrated and differential cross sections for isolated photon ...
ATLAS collaboration (2857 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Carvalho, JoãoA measurement of the production cross section for two isolated photons in proton-proton collisions at a center-of-mass energy of s=8 TeV is presented. The results are based on an integrated luminosity of 20.2 fb-1 recorded by the ATLAS detector at the Large Hadron Collider. The measurement considers photons with pseudorapidities satisfying |ηγ|<1.37 or 1.56<|ηγ|<2.37 and transverse energies of respectively ET...
Measurement of $W$ boson angular distributions in events with high transverse m...
ATLAS collaboration (2857 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Carvalho, JoãoThe W boson angular distribution in events with high transverse momentum jets is measured using data collected by the ATLAS experiment from proton–proton collisions at a centre-of-mass energy s=8 TeV at the Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb−1 . The focus is on the contributions to W+jets processes from real W emission, which is achieved by studying events where a muon i...
Measurement of the top quark mass in the $t\bar{t}\to$ dilepton channel from $\...
ATLAS collaboration (2857 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Cantrill, RobertThe top quark mass is measured in the tt¯→dilepton channel ( lepton=e,μ ) using ATLAS data recorded in the year 2012 at the LHC. The data were taken at a proton–proton centre-of-mass energy of s=8 TeV and correspond to an integrated luminosity of about 20.2 fb−1 . Exploiting the template method, and using the distribution of invariant masses of lepton– b-jet pairs, the top quark mass is measured to be mtop=172....
Measurements of fiducial cross-sections for $t\bar{t}$ production with one or t...
ATLAS collaboration (2857 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Cantrill, RobertFiducial cross-sections for $t\bar{t} $ production with one or two additional b-jets are reported, using an integrated luminosity of 20.3 fb$^{-1}$ of proton–proton collisions at a centre-of-mass energy of 8 TeV at the Large Hadron Collider, collected with the ATLAS detector. The cross-section times branching ratio for $t\bar{t} $ events with at least one additional b-jet is measured to be 950 $\pm $ 70 (stat.)...
Search for single top-quark production via flavour-changing neutral currents at...
ATLAS collaboration (2857 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Cantrill, RobertA 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 presented. Data collected with the ATLAS detector in 2012 at a centre-of-mass energy of 8 TeV and corresponding to an integrated luminosity of 20.3 fb$^{-1}$ are used. Candidate events for a top quark decaying into a lepton, a neutrin...
Search for direct top squark pair production in final states with two tau lepto...
ATLAS collaboration (2857 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Cantrill, RobertA search for direct pair production of the supersymmetric partner of the top quark, decaying via a scalar tau to a nearly massless gravitino, has been performed using 20 fb$^{-1}$ of proton–proton collision data at $\sqrt{s}=8~\mathrm{TeV}$ . The data were collected by the ATLAS experiment at the LHC in 2012. Top squark candidates are searched for in events with either two hadronically decaying tau leptons, one...
Search for the Higgs boson produced in association with a $W$ boson and decayin...
ATLAS collaboration (2857 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Carvalho, JoãoThis paper presents a dedicated search for exotic decays of the Higgs boson to a pair of new spin-zero particles, $H \rightarrow aa$ , where the particle a decays to b-quarks and has a mass in the range of 20–60 GeV. The search is performed in events where the Higgs boson is produced in association with a $W$ boson, giving rise to a signature of a lepton (electron or muon), missing transverse momentum, and mult...
Measurement of the CP-violating phase $\phi_s$ and the $B^0_s$ meson decay widt...
ATLAS collaboration (2857 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Cantrill, RobertA measurement of the B$_{s}^{0}$ decay parameters in the B$_{s}^{0}$ → J/ψϕ channel using an integrated luminosity of 14.3 fb$^{−1}$ collected by the ATLAS detector from 8 TeV pp collisions at the LHC is presented. The measured parameters include the CP -violating phase ϕ$_{s}$ , the decay width Γ$_{s}$ and the width difference between the mass eigenstates ΔΓ$_{s}$ . The values measured for the physical parame...