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At least 1,549 records · Page 86
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DOE OSTI2011

Search for squarks and gluinos using final states with jets and missing transverse momentum with the ATLAS detector in s = 7 TeV proton-proton collisions

CERN-LHC. Study of events having final states with no leptons, jets and missing transverse momentum, and with no reconstructed electrons or muons, in proton-proton collisions at a centre-of-mass energy of 7 TeV. Data are selected with various cuts and criteria to enhance different physics regions as described in the text of the paper. Exclusion limits on gluino and squark masses in SUSY models are presented for a simplified model (described in the paper) together with limits on m_0 and m_1/2 in MSUGRA/CMSSM models. The data sample has a total integrated luminosity of 1.04 FB-1 and shows no excess above the Standard Model background. Additional model interpretations are given in the Conference Note.

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DOE OSTI2011

Measurement of the inclusive and dijet cross-sections of b − jets in p p collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Measurements of the inclusive and dijet production cross sections for jets containing b-hadrons from proton-proton collisions at a centre-of-mass energy of 7 TeV. The analysis uses a data sample with total integrated luminosity of 34 pb^{-1}. b-jets are identified using either a lifetime-based method using vertex information or a muon-based method using the presence of a muon to identify semileptonic decays. The inclusive cross section is measured as a function of PT in range 20 to 400 GeV with |y| < 2.1. The dijet cross section is measured as a function dijet invariant mass in the range 100 to 760 GeV, the azimuthal difference between the two jets and the angular variable chi (defined as exp|y1-y2|) in two dijet mass regions.

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DOE OSTI2011

Search for heavy long-lived charged particles with the ATLAS detector in p p collisions at s = 7 TeV

CERN-LHC. Searches for long-lived particles reaching the muon spectrometer from proton-proton collisions at a centre-of-mass energy of 7 TeV using a data sample of total integrated luminosity of 37 pb-1. A search is made for sleptons, acting as heavy muons, with the results are interpreted in the framework of gauge-mediated SUSY breaking (GMSB) with the stau as the heavy long-lived particle (LLP). A search is also made for R-hadrons from coloured LLPs (squark and gluinos), No excesses above backgrounds are observed.

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DOE OSTI2011

Search for Massive Colored Scalars in Four-Jet Final States in s = 7 TeV proton-proton collisions with the ATLAS Detector

CERN-LHC. Measurement of the properties of four-jet events produced in proton-proton collisions at a centre-of-mass energy of 7 TeV in the search for pair-produced scalar particles, in particular scalar gluons. Distributions as a function of the average invariant masses of di-jet pairs are presented as well of several other variables.

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DOE OSTI2011

Measurement of the pseudorapidity and transverse momentum dependence of the elliptic flow of charged particles in lead-lead collisions at s N N = 2.76 TeV with the ATLAS detector

CERN-LHC. Experimental measurements of Elliptic Flow, v2(pT), as a function of pT for eight 10% centrality intervals (from 0-10% most central to 70-80% most peripheral), for pT from 0.5 to 20 GeV, and for three ranges in pseudorapidity (|eta| < 1, 1 < |eta| < 2 and 2 < |eta| < 2.5) (Tables 1-24). In addition, data points of pseudorapidity dependence of elliptic flow, v2(eta), in five pT intervals and eight 10% centrality intervals are presented (Tables 25-64). The elliptic flow parameter (v2) is measured as the second harmonic of the Fourier analysis of the azimuthal angle distribution relative to the azimuthal angle of the reaction plane. For more details see the paper.

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DOE OSTI2011

Measurements of the electron and muon inclusive cross-sections in proton-proton collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Measurements of the differential cross sections for muon and electron production in proton-proton collisions at a centre-of-mass energy of 7 TeV. The muon cross section is measured as a function of its transverse momentum in the range 4<PT<100 GeV for |pseudorapidity| < 2.5. In addition both the electron and muon cross sections are measured for |pseudorapidity| < 2.0 excluding the range 1.37-1.52. The data were collected during April-August 2010 with the electron(muon) sample having integrated luminosity 1.28+-0.04(1.42+-0.05) pb 1. The muon cross section is also shown after subtraction of the W/Z/GAMMA* component. The first 3 tables are the cross sections presented numerically in the paper and the remainder of the tables are the numerical values of the muon cross sections show in the figures as provided by the authors.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2011

Search for new phenomena in final states with large jet multiplicities and missing transverse momentum using s = 7 TeV p p collisions with the ATLAS detector

CERN-LHC. Measurement of distributions of events with 6 or more jets in association with missing transverse momentum produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample has a total integrated luminosity of 1.34 fb-1 and uses data-driven techniques to determine the backgrounds. Distributions of the number of jets and of the variable (Missing ET)/sqrt(HT) are presented, where HT is the scalar sum of the transverse momenta of all the jets in the event. Exclusion limits on M_1/2 versus M_0 in the contect of the MSUGRA/CMSSM are also presented. The tables also give, for illustrative purpose, the expectations from the MSUGRA/CMSSM point with M_0=1220 Gev and M_1/2=180 GeV.

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DOE OSTI2011

Measurement of the inclusive W &#xB1; and Z/gamma cross sections in the electron and muon decay channels in p p collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Measurement of the inclusive leptonic production cross sections for W+- and Z0/GAMMA* from proton-proton collisions at a centre-of-mass energy of 7 TeV. The data set has a total integrated luminosity of 35 pb-1 collected in 2010. The cross sections are given as a function of (pseudo)rapidity for (W+-)Z0 production and evaluated over a fiducial kinematic range and extrapolated to full phase space. Total cross sections are derived using the combined muon and electron decay modes assuming lepton universality. The correlations in systematic uncertainties are given for the 30 sources of systematic error defined in the text.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2011

Measurement of inclusive jet and dijet production in p p collisions at s = 7 TeV using the ATLAS detector

CERN-LHC. Measurements of the inclusive jet and di-jet cross sections in proton-proton collisions at a centre-of-mass energy of 7 TeV. The analysis is based on the 2010 data sample with a total integrated luminosity of 37 pb^{-1}. The anti-KT algorithm is used for jet clustering with data given using both the parameters R=0.4 and R=0.6. Double-differential cross sections are given as a function of the inclusive jet PT in rapidity (y) bins and of the di-jet invariant mass in bins of half of the rapidity separation of the two jets (y*). Details of the systematic errors and their correlations are given in the link below. In the tables the first (sys) error is the correlated (in PT) systematic error and the second is the uncorrelated systematic error, both produced by combining the relevant errors in quadrature.

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