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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 1,567 records · Page 87

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DOE OSTI2011

Measurement of the jet fragmentation function and transverse profile in proton-proton collisions at a center-of-mass energy of 7 TeV with the ATLAS detector

CERN-LHC. Measurements of the longitudinal relative momentum distributions of charged particles and their transverse profiles in jets of PT in the range 25-500 GeV produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample used has a total integrated luminosity of 36 pb-1. Jets are reconstructed using an anti-KT algorithm with the cone radius, R, in eta-phi space equal to 0.6. The measurements of the transverse profile are as a function of r, the separation of the charged particle from the jet axis in azimuth-rapidity space and PTrel, the PT of the charged particle relative to the jet axis.

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DOE OSTI2011

Measurement of the production cross section for Z/gamma* in association with jets in p p collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Measurements of cross sections for Z0/GAMMA* production plus jets in proton-proton collisions at a centre-of-mass energy of 7 TeV. The analysis includes the full 2010 data set, collected at low rate of collisions, with a total integrated luminosity of 36 pb^{-1}. Data are presented for Jet PT>30 GeV and |y|<4.4 with cross sections in both the individual electron and muon decay modes of the Z0/GAMMA* as well as combined after correction to a common lepton fiducial region of |y|<2.5 and PT>20 GeV and for QED radiation effects.

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DOE OSTI2011

Measurement of the Inelastic Proton-Proton Cross-Section at s = 7 TeV with the ATLAS Detector

CERN-LHC. Measurement of the inelastic proton-proton cross section at a centre-of-mass energy of 7 TeV. The data set has a total integrated luminosity of 20 mub-1 collected during a single 8 hour fill of the LHC beginning March 31st 2010. Scintillation counters in the forward region were used to select inelastic events. Results are given for a cut off of M(X)**2/S > 5*10**-6, equivalent to MX > 15.7 GeV at 7 TeV and also extrapolated to the full range M(P)**2/.S

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DOE OSTI2012

Search for supersymmetry in events with four or more leptons and missing transverse momentum in pp collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Study of events with four or more leptons (electrons or muons) and missing transverse momentum in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data were collected in 2011 and have an integrated total luminosity of 2.06 fb-1. Note that the additional requirements of missing ET > 50 GeV and a veto on the Z0 mass region, used in the analysis, is not applied in these tables, due to lack of statistics at those stages.

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DOE OSTI2011

Kshort and Λ production in p p interactions at s = 0.9 and 7 TeV measured with the ATLAS detector at the LHC

CERN-LHC. Measurements of the production cross sections for KS and LAMBDA hadrons in proton-proton collisions at centre-of-mass energies of 7 TeV and 0.9 TeV using data samples with total integrated luminosities of 190 mub-1 and 7 mub-1 respectively. The data, corrected to the |pseudorapidity| < 2.5 and PT > 100 MeV phase space regions, are presented as transverse momentum, rapidity and multiplicity distributions as well as production ratios between LAMBDABAR and LAMBDA baryons.

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DOE OSTI2012

Measurement of the azimuthal ordering of charged hadrons with the ATLAS detector

CERN LHC. Measurement of the ordering of charged hadrons in the azimuthal angle relative to the beam axis in proton-ptohon collisions at centre-of-mass energies of 900 GeV and 7 TeV. The results are presented as two power spectra S_ETA(XI) and S_E(OMEGA) defined in the paper and related to the sum over ETA-PHI and the sum over Energies respectively. See the text of the paper for the details. The 7 TeV data were taking from the beginning of 2010 and have an integrated luminsoity of 190 mub-1. The smalser sample of 900 GeV data has an integrated luminsoity of 7 mub-1. Results are shown three samples, one inclusive and the other two having enhanced and depleted low-PT content.

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DOE OSTI2011

Search for scalar bottom quark pair production with the ATLAS detector in p p Collisions at s = 7 TeV

CERN-LHC. Search for pair production of the scalar partners of bottom quarks in proton-proton collisions at a centre-of-mass energy of 7 TeV with a data set of integrated total luminosity of 2.05 fb-1. Events with large missing transverse momentum and two jets in the final state, where both jets have a b-quark signature, are studied. The data is interpreted in the context of an R-parity conserving MSSM scenario. assuming that the scalar bottom decays exclusively into a bottom quark and a neutralino. 95% CL upper limits are presented in the sbottom-neutralino mass plane both with the renormalization and factorization scale = mu, and also varying it by factors of 2 up and down (ie mu/2 and 2*mu). These are compared with the expected limits.

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DOE OSTI2011

Measurement of D ∗ + / − meson production in jets from pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

CERN-LHC. Measurement of the production rates of D*+ and D*- mesons in association with jets in proton-proton collisions at a centre-of-mass energy of 7 TeV. The analysis uses data with an integrated luminosity of 0.30 pb-1 (+-3.4%) collected between April and July 2010. Data are presented as ratios relative to the inclusive jet cross section as functions of the jet PT and Z (=longitudinal D* momentum/Jet energy) for absolute jet pseudorapidity < 2.5. The data are compared to various Monte Carlo predictions.

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DOE OSTI2012

Search for gluinos in events with two same-sign leptons, jets and missing transverse momentum with the ATLAS detector in p p collisions at s = 7 TeV

CERN-LHC. A search for gluinos decaying via the supersymmetric partner of the top (STOP) quark using events with two same-sign (SS) leptons, jets and missing transverse momentum. from proton-proton interactions at a centre-of-mass energy of 7 TeV. The data set has a total integrated luminosity og 2.05 fb-1. No excess beyond the SM is observed and exclusion limits are derived for simplified models where the gluino decays via the STOP and in the MSUGRA/CSSM framework. Data from the additional plots in the auxiliary material is also liniked here. In the distributions, where applicable: The errors on the DATA points represent the statistical uncertainty. The errors on the SM BACKGROUND represent the total uncertainty. The column labelled SIGNAL corresponds to a signal obtained with the decay gluino-> top stop chargino via off mass-shell stop (mass=1.2 TeV) in gluino-gluino pair-produced events with m(gluino)=650 GeV and m(chargino)=150 GeV.

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DOE OSTI2012

Search for events with large missing transverse momentum, jets, and at least two tau leptons in 7 TeV proton–proton collision data with the ATLAS detector

CERN-LHC. A study of events in proton-proton collisions at a centre-of-mass energy of 7 TeV characterised by having large missing transverse momentum, jets and at least two tau leptons from a data sample of integrated luminosity 2 fb-1. The analysis finds no excesses above the Standard Model and presents lower limits on the GMSB breaking scale, Lambda, and the ratio of the vacuum expectation values of the two Higgs doublets, tan(beta). Data on the acceptances and efficiencies are given here taken from the auxilliary material linked below.

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DOE OSTI2012

Search for supersymmetry in events with three leptons and missing transverse momentum in s = 7 TeV p p collisions with the ATLAS detector

CERN-LHC. Study of final states with exactly 3 leptons (muons or electrons) and missing transverse momentum produced in proton proton collisions at a centre-of-mass energy of 7 TeV using a data sample of total integrated luminosity of 2.06 fb-1 collected between March and August 2011. In a search for weak production of charginos and neutralinos the data are interpreted in the phenomenological minimal supersymmetric SM (pMSSM) model and in simplified models. See the text of the paper for details. The basic event selection requires exactly three leptons (electrons or muons) containg a Same Flavour Opposite Sign (SFOS) lepton pair and missing transverse energy > 50 GeV. In addition signal region SR1 (Z-depleted) has a veto on Z candidates and a veto on B-jets, and signal region SR2 (Z-enriched) requires a Z candidate This record tabulated the 1D event variable histograms and a variety of other 2D data such as acceptance and efficiency and cross section limits. Also given is a link to the SLHA files from the analyses.

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DOE OSTI2012

Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in p p collisions at s = 7 TeV

CERN-LHC. Search for pair production of the lighter scalar partners of top quarks (STOP1) in proton-proton collisions at a centre-of-mass energy of 7 TeV using data with a total integrated luminosity of 2.05fb-1. Events with two same flavour opposite-sign leptons (E or MU) with invariant mass consistent with a Z-boson (86-96 GeV), having large missing transverse momentum and jets, one being identified as a b-quark jet) in the final state are considered. Data is presented here from plots in the paper and from the auxilliary material linked below.

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DOE OSTI2012

Search for supersymmetry with jets, missing transverse momentum and at least one hadronically decaying τ lepton in proton-proton collisions at s = 7 TeV with the ATLAS detector

Data from a search for the production of SUSY particles in proton-proton interactions at a centre of mass of 7 TeV using final states contianing jets, missing transverse momentum and at least one hadronically decaying tau lepton. The data, collected between March and April 2011, has a total integrated luminosity of 2.05 +- 0.08 fb-1. The trigger required at least one jet with PT > 75 GeV and missing PT > 45 GeV. As well as the numerical values of the plots in the paper, this record lists the acceptances, efficiences, and other signal data.

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DOE OSTI2012

Search for anomaly-mediated supersymmetry breaking with the ATLAS detector based on a disappearing-track signature in p p collisions at s = 7 TeV

CERN-LHC. Study of events which have a disappearing track signature, characteristic of the decay of a nearly degenerate lightest chargino, produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample, collected from March to July 2011 has a total integrated luminosity of 1.02 fb-1. Events are selected at the trigger levels by requiring at least one jet, constructed using the anti-kT algorithm, with PT above 75 GeV and missing PT above 55 GeV. The data is interpreted in the minimal AMSB framework.

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DOE OSTI2012

Measurement of t t ¯ production with a veto on additional central jet activity in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector

CERN-LHC. Measurement of jet activity in t-tbar events produced in proton-proton collisions are a centre-of-mass energy of 7 TeV using a data sample of integrated luminsoity 2.05 fb-1. The events are selected in the dilepton decay channel with two identified b-jets from the top quark decays. Events are vetoed if they contain an additional jet with transverse momentum above a threshold in a central rapidity interval. The fraction of events surviving the jet veto is presented as a funtion of this threshold for four different central rapidity interval definitions. An alternate measurement is also presented, in which events are vetoed if the scalar transverse momentum sum of the additional jets in each rapidity interval is above a threshold.

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DOE OSTI2012

Measurement of charged-particle event shape variables in s = 7 TeV proton-proton interactions with the ATLAS detector

CERN-LHC. Measurements of the event shape variables Transverse Thrust, Transverse Thrust Minor and Transverse Sphericity in proton-proton collisions at a centre-of-mass energy of 7 TeV. Events with at least six final state charged particles are selected from a data sample collected in April 2010 with a minimum prescale factor for the minimum-bias trigger. In addition to the event shape distributions, data on the evolution of their mean values with charged particle multiplicity and scalar PT sum are presented.

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DOE OSTI2012

Underlying event characteristics and their dependence on jet size of charged-particle jet events in p p collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Measurements of the mean values and normalized distributions of multiplicity and transverse momentum of charged particles produced in final states containg on or more charged-particle jets in proton-proton interactions at a centre-of-mass energy of 7 TeV. The data sample used has a total integrated luminosity of 800 mub-1 with jets reconstructed using the anti-kt algorithm with radius parameter R varying between 0.2 and 1.0. The variables studied are the charged particle multiplcity, the scalar sum of the transverse momentum of charged particles and the average transverse momentum of the charged particles which equals the scalar sum divided by the multiplicity. Measurements are made separately in the regions opposite (AWAY) and transverse (TRANSVERSE) to the direction of the leading jet.

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DOE OSTI2012

Search for light scalar top quark pair production in final states with two leptons with the ATLAS detector in s = 7 TeV proton-proton collisions

CERN-LHC. Study of events with final states comprising two opposite charge leptons, large missing transverse momentum and at least one jet in proton proton collisions at a centre-of-mass energy of 7 TeV. Uses the full 2011 data sample of 4.7fb-1. Data is given for the distributions of leading PT of the leptons and jets and of Missing ET for E-E, E-MU and MU-MU final states.

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