12 research outputs found

    First flavor-tagged determination of bounds on mixing-induced CP violation in B-s(0)-> J/psi phi decays

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    Search for supersymmetry in events with large missing transverse momentum, jets, and at least one tau lepton in 20 fb−1 of √s= 8 TeV proton-proton collision data with the ATLAS detector

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    © 2014, The Author(s). A search for supersymmetry (SUSY) in events with large missing transverse momentum, jets, at least one hadronically decaying tau lepton and zero or one additional light leptons (electron/muon), has been performed using 20.3fb−1of proton-proton collision data at √ s= 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed in the various signal regions and 95% confidence level upper limits on the visible cross section for new phenomena are set. The results of the analysis are interpreted in several SUSY scenarios, significantly extending previous limits obtained in the same final states. In the framework of minimal gauge-mediated SUSY breaking models, values of the SUSY breaking scale Λ below 63 TeV are excluded, independently of tan β. Exclusion limits are also derived for an mSUGRA/CMSSM model, in both the R-parity-conserving and R-parity-violating case. A further interpretation is presented in a framework of natural gauge mediation, in which the gluino is assumed to be the only light coloured sparticle and gluino masses below 1090 GeV are excluded

    Searches for supersymmetry with the ATLAS detector using final states with two leptons and missing transverse momentum in root s=7 TeV proton-proton collisions

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    Measurement of the isolated diphoton cross-section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

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    The ATLAS experiment has measured the production cross-section of events with two isolated photons in the final state, in proton-proton collisions at sqrt(s) = 7 TeV. The full data set acquired in 2010 is used, corresponding to an integrated luminosity of 37 pb^-1. The background, consisting of hadronic jets and isolated electrons, is estimated with fully data-driven techniques and subtracted. The differential cross-sections, as functions of the di-photon mass, total transverse momentum and azimuthal separation, are presented and compared to the predictions of next-to-leading-order QCD.Comment: 15 pages plus author list (27 pages total), 9 figures, 2 tables, final version to appear in Physical Review

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

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    none3019G. Aad;B. Abbott;J. Abdallah;A. A. Abdelalim;A. Abdesselam;O. Abdinov;B. Abi;M. Abolins;H. Abramowicz;H. Abreu;E. Acerbi;B. S. Acharya;D. L. Adams;T. N. Addy;J. Adelman;M. Aderholz;S. Adomeit;P. Adragna;T. Adye;S. Aefsky;J. A. Aguilar-Saavedra;M. Aharrouche;S. P. Ahlen;F. Ahles;A. Ahmad;M. Ahsan;G. Aielli;T. Akdogan;T. P. A. Åkesson;G. Akimoto;A. V. Akimov;A. Akiyama;M. S. Alam;M. A. Alam;J. Albert;S. Albrand;M. Aleksa;I. N. Aleksandrov;F. Alessandria;C. Alexa;G. Alexander;G. Alexandre;T. Alexopoulos;M. Alhroob;M. Aliev;G. Alimonti;J. Alison;M. Aliyev;P. P. Allport;S. E. Allwood-Spiers;J. Almond;A. Aloisio;R. Alon;A. Alonso;B. Alvarez Gonzalez;M. G. Alviggi;K. Amako;P. Amaral;C. Amelung;V. V. Ammosov;A. Amorim;G. Amorós;N. Amram;C. Anastopoulos;L. S. Ancu;N. Andari;T. Andeen;C. F. Anders;G. Anders;K. J. Anderson;A. Andreazza;V. Andrei;M-L. Andrieux;X. S. Anduaga;A. Angerami;F. Anghinolfi;A. Anisenkov;N. Anjos;A. Annovi;A. Antonaki;M. Antonelli;A. Antonov;J. Antos;F. 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Marchiori;M. Marcisovsky;A. Marin;C. P. Marino;F. Marroquim;R. Marshall;Z. Marshall;F. K. Martens;S. Marti-Garcia;A. J. Martin;B. Martin;B. Martin;F. F. Martin;J. P. Martin;Ph. Martin;T. A. Martin;V. J. Martin;B. Ma

    Search for the Higgs Boson in the H\u2192WW\u2192l\u3bdjj Decay Channel in pp Collisions at sqrt[s]=7\u2009\u2009TeV with the ATLAS Detector

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    Search for Diphoton Events with Large Missing Transverse Energy in 7 TeV Proton-Proton Collisions with the ATLAS Detector

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    A search for diphoton events with large missing transverse energy is presented. The data were collected with the ATLAS detector in proton-proton collisions at √s=7  [square root of s=7] TeV at the CERN Large Hadron Collider and correspond to an integrated luminosity of 3.1  pb-1 [pb superscript -1]. No excess of such events is observed above the standard model background prediction. In the context of a specific model with one universal extra dimension with compactification radius R and gravity-induced decays, values of 1/R<729  GeV are excluded at 95% C. L., providing the most sensitive limit on this model to date.United States. Dept. of EnergyNational Science Foundation (U.S.

    Measurement of the production cross section for Z/\u3b3* in association with jets in pp collisions at sqrt[s]=7\u2009\u2009TeV with the ATLAS detector

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    Luminosity determination in pp collisions at root s=7 TeV using the ATLAS detector at the LHC

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    Measurements of luminosity obtained using the ATLAS detector during early running of the Large Hadron Collider (LHC) at root s = 7 TeV are presented. The luminosity is independently determined using several detectors and multiple algorithms, each having different acceptances, systematic uncertainties and sensitivity to background. The ratios of the luminosities obtained from these methods are monitored as a function of time and of mu, the average number of inelastic interactions per bunch crossing. Residual time- and mu-dependence between the methods is less than 2% for 0 < mu < 2.5. Absolute luminosity calibrations, performed using beam separation scans, have a common systematic uncertainty of +/- 11%, dominated by the measurement of the LHC beam currents. After calibration, the luminosities obtained from the different methods differ by at most +/- 2%. The visible cross sections measured using the beam scans are compared to predictions obtained with the PYTHIA and PHOJET event generators and the ATLAS detector simulation

    Search for Diphoton Events with Large Missing Transverse Energy in 7 TeV Proton-Proton Collisions with the ATLAS Detector

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