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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 1,315 records · Page 73
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DOE OSTI2012

ATLAS Measurements of the Properties of Jets for Boosted Particle Searches

CERN-LHC. Study of the properties of high transverse momentum jets produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. Using a dataset of total integrated luminsoity of 35 pb-1, collected during 2010, measurements are present of jet mass, width, eccentricity, planar flow and angularity for jets reconstructed using the anti-kt algorithm with distance parameter R=0.6 and 1.0. The data cover the transverse momentum region > 300 GeV and |pseudorapidity| < 2.

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DOE OSTI2012

Search for long-lived, heavy particles in final states with a muon and multi-track displaced vertex in proton-proton collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Study of events with final states containing charged hadrons and an associated muon produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample, collected in 2011, has an integrated luminosity of 4.4 fb-1. The data are interpreted in the context of R-parity violating supersymmetric scenarios in a search for heavy particles with long lifetimes decaying into these final states.

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DOE OSTI2012

Search for resonant top plus jet production in t t &#xAF; + jets events with the ATLAS detector in p p collisions at s = 7 TeV

CERN-LHC. Search for a new heavy particle produced in association with a top or antitop quark in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data set used is the full 2011 data set with a total integrated luminosity of 4.7 fb-1. The paper considers two models in which a new heavy particle is a colour singlet (WPRIME model) or a colour triplet (PHI model) decaying respectively into TBAR-Q or T-Q which lead to a resonance within the TTBAR+JETS signature. The tables here give the numerical values of the upper limits of the heavy particle cross sections and couplings for each model.

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DOE OSTI2012

Search for top and bottom squarks from gluino pair production in final states with missing transverse energy and at least three b-jets with the ATLAS detector

CERN-LHC. The results of a search for top and bottom squarks from gluino pair production produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample used is the full 2011 data set with an integrated luminosity of 4.7 fb-1. A previous paper (PR D85(2012)112006 - arXiv:1203.6193) presented similar results using the data set from the first half of 2011. The search is performed in events with large missing transverse momentum and at least 3 jets identified as originating from a b-quark. Exclusion limits are presented for a variety of gluino-mediated models.

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DOE OSTI2012

Measurement of Upsilon production in 7 TeV pp collisions at ATLAS

CERN-LHC. Measurements of the production cross sections for Upsilon 1S, 2S and 3S mesons in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample used has an integrated luminosity of 1.8 fb-1 collected between March and August 2011. The data cover the Upsilon |y| region 0-2.25 and PT < 70 GeV/c. The data are given assuming unpolarized Upsilon production. Acceptance weights are also given in the link below for the effects of different polarization scenarios.

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DOE OSTI2012

Search for Supersymmetry in Events with Large Missing Transverse Momentum, Jets, and at Least One Tau Lepton in 7 TeV Proton-Proton Collision Data with the ATLAS Detector

CERN-LHC. Study of events from proton-proton interactions at a centre-of-mass energy of 7 Tev which have final states comprising large missing transverse momentum, jets and at least one hadronically decaying TAU letpton accompanied by zero or one additional light lepton (ELECTRON or MUON). The data sample, collected during 2011, has an integrated luminosity of 4.7 fb-1. In the framework of gauge-mediated SUSY-breaking (GMSB) models, lower limits on the mass scale LAMBDA are determined. Data are presented for four channels comprising single and double TAU production with no extra light leptons and single TAU production with an ELECTRON and with a MUON. The exclusion data are from the combined channels. Acceptances and efficiencies for each channel are tabulated.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2012

Search for contact interactions and large extra dimensions in dilepton events from p p collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Study of events with two isolated electrons or muons produced in proton-proton interactions at a centre-of-mass energy of 7 TeV. The data samples used, collected throughout 2011, have integrated luminsoities of 4.9 and 5.0 fb-1 in the electron and muon channels, respectively. The data are used in a search for non-resonant new phenomena, originating from either contact interactions or large extra spatial dimensions. The reader is referred to the text of the paper for more details.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2013

Measurement of kT splitting scales in W->lv events at sqrt(s)=7 TeV with the ATLAS detector

CERN-LHC. A measurement of the splitting scales, as defined by the kT clustering algorithm, for final states containg a W boson produced in proton-proton collisions at a centre-of-mass energy 7 TeV. The measurements uses the full 2010 data sample with a total integrated luminsoity of 36 pb-1. The measurements are made separately for W bosons decaying into electron and muuon final states. Details of the splitting scale variable d_k are described in the paper. Data on the four hardest splitting scales d0,d1,d2 and d3 are presented together with their ratios.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2012

Search for magnetic monopoles in s = 7 TeV p p collisions with the ATLAS detector

CERN-LHC. Search for magnetic monopoles in proton-proton collisions at a centre-of-mass energy of 7 TeV using data with a total integrated luminosity of 2.0 fb-1. Magnetic monopoles are characterized by large localized energy deposits in the LAr EM calorimeter (EMCLUSTER) in conjunction with a region of high ionization density in the transition radiation tracker, TRT. This record lists the efficiency for detection of such monopoles of two masses (200 and 1500 GeV) and the upper limits of the cross sections assuming production by Drell-Yan processes and in the fiducual region.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2012

Measurement of Z boson Production in Pb+Pb Collisions at s N N = 2.76 TeV with the ATLAS Detector

CERN-LHC. Measurements of the PT and rapidity distributions of Z bosons produced in Lead-Lead collisions at a nucleon-nucleon centre-of-mass energy of 2.76 TeV. The data sample has 1995 Z boson candidates from the 2011 heavy-ion run with a total integrated luminosity of 0.15 nb-1. The electron and muon decay channels of the Z boson are found to be consistent and combined results are presented. In addition to the rapidity and PT distributions in different centrality regions, the centrality (Npart) dependence of the Z boson yield divided by the mean number of collisions, Ncoll, is presented.

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DOE OSTI2012

Search for new phenomena in events with three charged leptons at / s q r t s = 7 TeV with the ATLAS detector

CERN-LHC. Measurement of the properties of events with 3 or more charged leptons produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample used has a total integrated luminosity of 4.6 fb-1 collected in 2011. The events are required to contain at least two electrons or muons, while the third lepton can be either an additional electron or muon, or a hadronically decaying tau lepton. Events are catagorized by the presence or absence of a reconstructed tau-lepton or a Z-boson candidate decaying into leptons. As well as the fiducial efficiencies the resuts are given as upper limits on event yields from non-SM processes producing at least 3 prompt, isolated leptons, given as functions of the lower bounds on several kinematic variables.

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DOE OSTI2013

Search for long-lived, multi-charged particles in pp collisions at s =7 TeV using the ATLAS detector

CERN-LHC. Measurements of the upper limits of cross sections for the production of highly ionising, penetrating particles with electric charges, |q|, from 2e to 6e in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data, collected during the 2011 running period, have an integrated luminosity of 4.4 fb-1. The observed upper limits are present together with the expected limits. Also shown are the rapidly falling cross sections from the Drell-Yan model.

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DOE OSTI2012

Search for light top squark pair production in final states with leptons and b &#x2212; jets with the ATLAS detector in s = 7 TeV proton-proton collisions

CERN-LHC. Study of events from proton-proton interactions at a centre-of-mass energy of 7 TeV which have final states comprising exclusively one or two leptons (either electrons or muons), large missing transverse momentum, light flavour jets and b-jets. The data sample used has an integrated luminosity of 4.7 fb-1. The data are analysed in the framework of MSSM assuming the top squark decays exclusively to a chargino and b-quark. The data is divided into three signal regions, one (1LSR) requiring only one lepton with two light-quark jets and 2 b-jets, and two (2LSR1 and 2LSR2) requiring only two leptons and two leading jets with different requirements on the minimum energy and invariant mass of the specific subsystem from the hard-scattering process. The reader is refered to the text of the paper for more details.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2012

Measurement of angular correlations in Drell-Yan lepton pairs to probe Z/gamma* boson transverse momentum at sqrt(s)=7 TeV with the ATLAS detector

CERN-LHC. Measurements of the PHI* distributions of di-electron and di-muon Drell-Yan pairs produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample has an integrated luminosity of 4.6 fb-1. Normalised differential PHI* distributions are presented within the fiducial region of the leptons corrected to three levels, Born, dressed and bare, for QED FSR. The data are presented for di-electron and di-muons separately as well as combined, and also in three regions of rapidity as well as overall. For details of the variables see the text of the article. UPDATE (05 JAN 2015): corrected columns 2,3,4 of Tables 2,3,5,6 due to a bug fixed for bare and dressed cross sections in y-ranges; Table 4, value of the very last bin of the born dimuon, y>1.6, phi*=2.522-3.277 corrected (typo error).

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DOE OSTI2013

Measurement of the high-mass Drell--Yan differential cross-section in pp collisions at sqrt(s)=7 TeV with the ATLAS detector

CERN-LHC. Based on an integrated luminosity of 4.9 /fb, the differential cross-section in the Z/gamma* to e+e- channel is measured with the ATLAS detector as a function of the invariant mass, Mee, in the range 116 < Mee < 1500 GeV, for a fiducial region in which both the electron and the positron have transverse momentum pT > 25 GeV and absolute pseudorapidity |eta| < 2.5.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2013

Search for third generation scalar leptoquarks in pp collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Study of events with final states consisting of one electron or muon with large PT, one high-PT hadronically decaying tau, missing ET from the tau decays, and two high-PT jets, produced in proton-proton collisions at a centre-of-lass enegy of 7 TeV. The data sample used has an integraterd luminosity of 4.7 fb-1 collected during 2011. The data are used to set limits on the production of pairs of 3rd generation leptoquarks which decay in a tau plus b-quark with an assumed branching ratio of 100% with only the specific lepton-hadron decay mode of the tau being sought after here. The limits are shown separately for the electron and muon decay modes of the tau and for the combined two modes combined.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2013

Measurement of the differential cross-section of B + meson production in pp collisions at s = 7 TeV at ATLAS

CERN-LHC. The production cross section of B+ mesons is measured as a function of transverse momentum and rapidity in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample used has an integrated luminosity of 2.4 fb-1, with an uncertainty of 1.8%, with results covering the PT range from 9 GeV to 120 GeV and |y| < 2.25.

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