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At least 1,585 records · Page 88
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DOE OSTI2012

Measurement of the jet radius and transverse momentum dependence of inclusive jet suppression in lead-lead collisions at s N N = 2.76 TeV with the ATLAS detector

CERN-LHC. Measurements of the ratio, Rcp, between jet production in the central to peripheral regions in Lead Lead collisions at a centre of mass energy/nucleon of 2.76 TeV. Jets are reconstructed with |eta|<2.1, covering the jet PT range 38-210 GeV, using the anti-Kt algorithm with norminal jet radii of R=0.2, 0.3, 0.4 and 0.5. Seven regions of centrality are considered from the most peripheral of 60-80% to the most central 0-10%. Rcp is studied as a function of jet PT, number of participating nucleons NPART and R for each of the centrality regions, as well as the ratio of Rcp/Rcp(R=0.2) as a function of jet PT for each R=0.3, 0.4 and 0.5. Finally values of the covariance matrix for staistical correlations between jet PT bins are given. In the tables the first systematic errors are from JES, JER, efficiency, xin and Rcoll and are 100% correlated in PT. The second systematic errors are those that are partially correlated or uncorrelated in pt, taken to be 100% uncorrelated, from the regularization parameter.

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DOE OSTI2012

Search for new phenomena in the W W to &#x2113; &#x3BD; &#x2113; ' &#x3BD; ' final state in p p collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Search for a heavy particle that decays to W+W- produced in proton-proton collisions at a centre-of-mass energy of 7 TeV using a data sample of integrated luminosity of 4.7 fb-1. Data are compared with standard model predictions and upper limits are set for Randall-Sundrum (SR) and bulk-RS graviton production.

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DOE OSTI2012

Search for a supersymmetric partner to the top quark in final states with jets and missing transverse momentum at s = 7 TeV with the ATLAS detector

CERN-LHC. Study of final states with at least six jets and large missing transverse energy from proton-proton interactions at a centre-of-mass energy of 7 TeV. The data sample with a total integrated luminosity of 4.7 fb-1 was collected during 2011. Events are required to have at least one jet with PT > 130 GeV and at least another five with PT > 30 GeV all within the pseudorapidity range -2.8-2.8. Two signal regions are defined one with missing ET > 150 GeV (SRA) and a second with missing ET > 260 GeV (SRB). Events with isolated electrons or muons are rejected. See the text of the paper for more details. The results are analysed in terms of direct pair production of supersymmetric top quarks (STOP_1) assuming their decay into a top quark and the lightest SUSY particle (LSP), a neutralino. Cross sections, Number of generated events, Acceptances and Efficiencies are presented here for both signal regions as functions of the STOP and NEUTRALINO masses.

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DOE OSTI2012

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in s = 7 TeV p p collisions with the ATLAS detector

CERN-LHC. Data are presented from the measurements of final states comprising three leptons (electrons or muons) and missing transverse energy in proton proton collisions at a centre-of-mass energy of 7 Tev. The data sample has a total integrated luminosity of 4.7fb-1 and is interpreted in the pMSSM and in simplified models using different signal regions. You are referred to the text of the paper for more details.

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DOE OSTI2012

Measurement of the azimuthal anisotropy for charged particle production in s N N = 2.76 TeV lead-lead collisions with the ATLAS detector

Differential measurements of charged particle azimuthal anisotropy are presented for lead-lead collisions at a centre-of-mass energy of 2.76 TeV/nucleon. The anisotropy is characterized via a Fourier expansion of the distribution of charged particles in azimuthal angle relative to the reaction plane, with the coefficients V_n denoting the magnitude of the anisotropy. A Fourier analysis of the charged particle pair distribution in relative angle is performed extracting the coefficients V_nn.

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DOE OSTI2012

Measurement of W Z production in proton-proton collisions at s = 7 TeV with the ATLAS detector

CERN-LHC. Measurements of the cross section for W+- plus Z0 production in proton proton collisions at a centre-of mass energy of 7 TeV. The data sample used, collected during 2011, has a total integrated luminosity of 4.6 fb-1 with 317 candidate events in the double leptonic decay final state with electrons, muons and missing transverse momentum. The total cross section is presented together with fiducial cross sections in a common phase space region.

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DOE OSTI2012

Measurement of inclusive two-particle angular correlations in pp collisions with the ATLAS detector at the LHC

CERN-LHC. Study of the angular correlations between pairs of charged particles produced in proton-proton collisions at centre-of-mass energies of 900 GeV and 7 TeV. The data were collected during the 2009 and 2010 LHC running periods with total integrated, low instantaneous, luminosities of 7 mub-1 and 190 mub-1 respectively using a minimum bias trigger. Correlations are measured for charged particles produced in the kinematic range of PT > 100 MeV and |pseudorapidity| < 2.5. See the paper for definition of the correlation function (RCORR).

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DOE OSTI2012

Search for lepton flavour violation in the emu continuum with the ATLAS detector in s = 7 TeV p p collisions at the LHC

CERN-LHC. Study of the opposite charge E-MU continuum produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data, collected between March and August 2011, has a total integrated luminosity of 2.08 fb-1 and is used in a search for t-channel exchange of an R-parity violating scalar top quark and is found to be consistent with the expectations from Standard Model backgrounds. Additional plots are to be found in the auxilliary material linked below.

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DOE OSTI2012

Search for high-mass resonances decaying to dilepton final states in pp collisions at s**(1/2) = 7-TeV with the ATLAS detector

CERN-LHC. Study of high-mass lepton pairs (electron-positrons or muon-antimuons) produced in proton-proton collisions at a centre of mass energy of 7 TeV using data samples with integrated luminsoity of 4.9 fb-1 in the electron channel and 5.0 fb-1 in the muon channel. The results are interpreted in the search for the heavy boson resonances: heavy neutral Zprime gauge bosons, Randall-Sundrum gravitons, Z* bosons, techni-mesons, Kaluza-Klein Z/gamma bosons and bosons predicted by Torsion models.

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DOE OSTI2012

Search for R-parity-violating supersymmetry in events with four or more leptons in s = 7 TeV p p collisions with the ATLAS detector

CERN-LHC. Measurement of final states with four or more leptons (electrons or muons) produced in proton-proton collisions at a centre-of-mass energy of 7 TeV. The data sample has a total integrated luminosity of 4.7 fb-1. Comparisons with the Standard Model are made in two signal regions: one that requires moderate values of missing transverse momentum and the other that requires large effective mass. The data are interpreted in a simplified model of R-parity-vilaiting supersymmetry and in an R-partiy-violating MSUGRA/CMSSM model.

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DOE OSTI2012

Search for a heavy top-quark partner in final states with two leptons with the ATLAS detector at the LHC

CERN-LHC. Search for direct pair production of heavy top-quark partners in proton-proton interactions of centre-of-mass energy of 7 TeV with a final state containing 2 leptons. The data sample taken during 2011 has a total integrated luminosity of 4.7 fb-1. Two models are compared with the data, one with a spin 1/.2 heavy top-quark and a heavy neutral partner and the other a supersymmetric scalar top quark and a massless neutralino. See the text of the paper for more details.

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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

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.

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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.

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