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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 1,513 records · Page 84
All sourcesNASA NTRSDOE OSTI
DOE OSTI2017

Measurement of quarkonium production in proton--lead and proton--proton collisions at 5.02 TeV with the ATLAS detector

CERN-LHC. The modification of the production of J/psi psi(2S), and Upsilon(nS) (n = 1, 2, 3) in p+Pb collisions with respect to their production in pp collisions has been studied. The p+Pb and pp datasets used in this paper correspond to integrated luminosities of 28 nb^-1 and 25 pb^-1 respectively, collected in 2013 and 2015 by the ATLAS detector at the LHC, both at a centre-of-mass energy per nucleon pair of 5.02 TeV.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2018

Search for Higgs boson pair production in the γ γ b b ¯ final state with 13 TeV p p collision data collected by the ATLAS experiment

Limits on pair production of Higgs bosons in the final state where one Higgs boson decays to two photons and the other to a b-quark together with its antiparticle. The search is based on 36.1 +/- 1.2 fb^{-1} of pp collisions at sqrt{s} = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Data include at least one b-tagged jet and two well-identified isolated photons. The search is sensitive to both resonant and non-resonant production of Higgs boson pairs.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2017

Search for heavy Z Z resonances in the ℓ + ℓ − ℓ + ℓ − and ℓ + ℓ − ν ν ¯ final states using proton proton collisions at s = 13 TeV with the ATLAS detector

CERN-LHC. Search for heavy ZZ resonances in the 4l and 2l2nu final states using proton-proton collisions at a center-of-mass energy of 13 TeV with 36.1 fb^{-1} of data collected during 2015 and 2016 with the ATLAS detector. Different mass ranges for the hypothetical resonances are considered, depending on the final state and model. The different ranges span between 200 GeV and 2000 GeV. The results are interpreted as upper limits on the production cross section of a spin-0 or spin-2 resonance.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2018

Search for dark matter in events with a hadronically decaying vector boson and missing transverse momentum in p p collisions at s = 13 TeV with the ATLAS detector

CERN-LHC. This entry relates to the search for Dark Matter (DM) in association with a hadronically decaying vector boson with 36.1 fb-1 of pp collision data at a center-of-mass energy of sqrt(s) = 13 TeV recorded by the ATLAS detector at the LHC. In adition to hadronic decays of W and Z bosons, decays of the non-Standard-Model vector boson Z' of unknown masses are also considered for the first time (mono-Z'). The results are interpreted in terms of limits on the invisible Higgs boson decays into Dark Matter particles, constraints on the patamter space of the simplified vector-mediator model and generic upper limits on the visible detector-level cross sections for the W/Z+DM production. The results of the mono-Z' are shown in the frame of two simplified-model scenarios involving the DM production in assocaiation with the Z' boson. These are the dark Higgs model and the dark fermion model, each with a light and heavy dark sector scenario.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2018

Combined measurement of differential and total cross sections in the H → γ γ and the H → Z Z ∗ → 4 ℓ decay channels at s = 13 TeV with the ATLAS detector

CERN-LHC. Combined measurement of Higgs boson differential cross sections using 36.1 fb^−1 of proton-proton collisions collected at a centre-of-mass energy of 13 TeV with the ATLAS detector in 2015 and 2016. The final states used are diphoton and four-lepton. The definition of fiducial region can be found in JHEP 03 (2018) 095 for the four-lepton decay channel, and arXiv:1802.04146 (submitted to PRD) for the diphoton decay channel. The measurements in the fiducial regions are extrapolated to the full phase-space before they are combined between the two channels.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2018

Search for new phenomena in events with same-charge leptons and b -jets in p p collisions at s = 13 TeV with the ATLAS detector

CERN-LHC, ATLAS. This result is a search for new phenomena in events with two same-charge leptons or three leptons and jets identified as originating from b-quarks in a data sample of 36.1 fb−1 of pp collisions at √s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. No significant excess is found and limits are set on vector-like quark, four-top-quark, and same-sign top-quark pair production.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2018

Search for Higgs boson pair production in the γ γ W W ∗ channel using p p collision data recorded at s = 13 TeV with the ATLAS detector

Limits on pair production of Higgs bosons in the final state where one Higgs boson (H) decays to two photons and the other to a b-quark together with its antiparticle. The search is based on 36.1 +/- 1.2 fb^{-1} of pp collisions at sqrt{s} = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2018

Measurement of photon-jet transverse momentum correlations in 5.02 TeV Pb+Pb and p p collisions with ATLAS

CERN-LHC. Measurements of the transverse momentum balance between isolated photons and inclusive jets are presented using 0.49 nb^{-1} of Pb+Pb collision data at 5.02 TeV and 25 pb^{-1} of pp collision data at 5.02 TeV recorded with the ATLAS detector at the LHC. Photons with pT(γ)>63.1 GeV and |eta(γ)|<2.37 are paired inclusively with all jets that have pT>31.6GeV and |eta|<2.8 in the event. The transverse momentum balance given by the jet-to-photon pT ratio, xJγ, are measured for pairs with azimuthal opening angl dphi > 7pi/8. Distributions of the per-photon jet yield (1/Nγ)(dN/dxJγ) are corrected via a two-dimensional unfolding procedure for detector effects and reported at the particle level for the first time. In pp collisions, the distributions are well described by Monte Carlo event generators. In Pb+Pb collisions, the xJγ distribution is modified with increasing centrality, consistent with the picture of parton-energy loss in the hot nuclear medium. The data are compared to a suite of energy loss models and calculations.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2018

Search for chargino and neutralino production in final states with a Higgs boson and missing transverse momentum at s = 13 TeV with the ATLAS detector

CERN-LHC. A search is presented for the electroweak pair production of a chargino and a neutralino, where the chargino decays to the lightest neutralino and the W boson, while the neutralino decays to the lightest neutralino and the 125 GeV Higgs boson. Fully hadronic, semi-leptonic, and multi-lepton final states with large missing transverse momentum are considered in this search. Higgs bosons in the final state are identified by either two jets identified as originating from bottom quarks, or two photons, or a second electron or muon with the same electric charge.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2018

Search for pairs of highly collimated photon-jets in p p collisions at s = 13 TeV with the ATLAS detector

CERN-LHC. Search for the pair production of photon-jets---collimated groupings of photons---with the ATLAS detector. Highly collimated photon-jets can arise from the decay of new, highly boosted particles that can decay to multiple photons collimated enought to be identified in the electromagnetic calorimeter as a single, photon-like energy cluster.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2019

Search for heavy charged long-lived particles in the ATLAS detector in 31.6 fb &#x2212; 1 of proton-proton collision data at s = 13 TeV

CERN-LHC. Search for heavy charged long-lived particles in the ATLAS detector in 36.1/fb of proton-proton collision data at sqrt(s) = 13 TeV. A search for heavy charged long-lived particles is performed using a data sample of 36.1/fb of proton-proton collisions at sqrt(s) = 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. The search is based on observables related to ionization energy loss and time of flight, which are sensitive to the velocity of heavy charged particles traveling significantly slower than the speed of light. Multiple search strategies for a wide range of lifetimes, corresponding to path lengths of a few meters, are defined as model-independently as possible, by referencing several representative physics cases that yield long-lived particles within supersymmetric models, such as gluinos/squarks (R-hadrons), charginos and staus. No significant deviations from the expected Standard Model background are observed. Upper limits at 95% confidence level are provided on the production cross sections of long-lived R-hadrons as well as directly pair-produced staus and charginos. These results translate into lower limits on the masses of long-lived gluino, sbottom and stop R-hadrons, as well as staus and charginos of 2000 GeV, 1250 GeV, 1340 GeV, 430 GeV and 1090 GeV, respectively.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2018

Measurements of fiducial and differential cross-sections of t t &#xAF; production with additional heavy-flavour jets in proton-proton collisions at s = 13 TeV with the ATLAS detector

CERN-LHC. Measurements of fiducial and differential cross section for top-quark pair production with additional heavy-favour jets in the dilepton and lepton+jets decay channels in proton-proton collisions at a centre-of-mass energy of 13 TeV with 36.1 fb^-1 of data collected in 2015 and 2016.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2019

Measurement of the ratio of cross sections for inclusive isolated-photon production in p p collisions at s = 13 and 8 TeV with the ATLAS detector

CERN-LHC. Measurement of the ratio of cross sections for inclusive isolated-photon production in proton-proton collisions at a centre-of-mass energy of 13 TeV over 8 TeV. Measurement is also presented of the double ratio of the ratio above to the ratio of the fiducial cross sections for Z boson production at 13 TeV and 8 TeV using the decay channels Z into an electron-positron pair and Z into a muon-antimuon pair.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗