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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 1,387 records · Page 77
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DOE OSTI2010

Search for Quark Contact Interactions in Dijet Angular Distributions in p p Collisions at s = 7 TeV Measured with the ATLAS Detector

CERN-LHC. Measurement of dijet angular distributions from the first LHC PP collisions at a centre-of-mass energy of 7 TeV. The data sample has an integrated luminosity of 3.1 pb-1 and dijet angular distributions and centrality ratios are measured up to a dijet mass of 2.8 TeV. The angular distributions are presented in the form of the variable CHI=exp(y_1-y_2) where y_1,2 are the rapidities of the two leading jets. The centrality ratio is the ratio between the number of events with both jets in the absolute pseusdorapidity range 0.0 to 0.7 to the number with both jets in the range 0.7 to 1.3. In the tables both the measured data with statistical errors and the QCD predictions with systematic uncertainties are listed. Numerical values were supplied by Henri Bachacou.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2010

Search for New Particles in Two-Jet Final States in 7 TeV Proton-Proton Collisions with the ATLAS Detector at the LHC

CERN-LHC. Measurement of the dijet mass spectrum in PP collisions at a centre-of-mass energy of 7 TeV in a search for new particle resonances. The data sample has an integrated luminosity of 315 nb-1. No resonances were observed and upper limits for the cross section*signal acceptance for excited-quarks were set. The numerical values were supplied by Henri Bachacou.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2010

Measurement of the production cross section for W-bosons in association with jets in p p collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Measurement of the inclusive W+jets cross section in proton-proton collisions at centre-of-mass enrgy 7 TeV. The data, collected from March to August 2010 have an integrated luminosity of 1.3 pb-1, and have been corrected for all known detector effects and are quoted within limited and well defined ranges of jet and lepton kinematics. Jets were reconstructed using the anti-kT algoithm with radius parameter R = 0.4. The lepton energy is defined as the energy of the lepton after radiation plus the energy of all radiated photons within DeltaR=0.1 around the lepton. Additionally the distance from the lepton to the jet axis was required to have DeltaR=>0.5 and muons were isolated with DeltaR>0.2. Cross sections are presented, in both the electron and muon decay modes of the W, as a function of jet multiplicity and transverse momentum of both the leading and next-to-leading jets in the event. Where appropriate in the tables the second DSYS error is the luminosity uncertainty. Numerical values supplied by M Dunford.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2011

Measurements of underlying-event properties using neutral and charged particles in p p collisions at 900 GeV and 7 TeV with the ATLAS detector at the LHC

CERN-LHC. Measurement of charged and neutral particle distributions in proton-proton collisions at centre-of-mass energies of 0.9 and 7 TeV. The data have been collected using a minimum-bias trigger during 6-15 December 2009 (0.9 TeV) and March 30-April 27 2010 (7 TeV). The analysis uses topological clusters with transverse momentum > 0.5 GeV and |pseudorapidity| < 2.5 to be comparible witgh previous Underlying Event data using charged tracks. Particle densities are presented as a function of Delta(phi), the difference in azimuthal angle between the leading cluster and the mean of all the other clusters in the event. Data on average number of partices and summed pT as a function of the leading cluster pT are also given. Numerical values suppled by Jinlong Zhang.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2010

Charged-particle multiplicities in pp interactions measured with the ATLAS detector at the LHC

CERN-LHC. Measurement of inclusive charged particle distributions in proton proton collisions at centre-of-mass energies 0.9, 2.36 and 7 TeV using a single-arm minimum-bias trigger. Distributions of charged particle multiplicity and its dependence on pseudorapidity and transverse momentum are presented from ~190 mub-1 of data at 7 Tev, ~7 mub-1 at 0.9 TeV, and ~0.1 mub-1 at 2.36 GeV.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗