4 research outputs found

    Searches for scalar leptoquarks in pp collisions at √s = 8 TeV with the ATLAS detector

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    Searches for pair-produced scalar leptoquarks are performed using 20 fb−1^{-1} of proton-proton collision data provided by the LHC and recorded by the ATLAS detector at s=8\sqrt{s}=8 TeV. Events with two electrons (muons) and two or more jets in the final state are used to search for first (second)-generation leptoquarks. The results from two previously published ATLAS analyses are interpreted in terms of third-generation leptoquarks decaying to bΜτbˉΜτˉb\nu_{\tau}\bar{b}\bar{\nu_{\tau}} and tΜτtˉΜτˉt\nu_{\tau}\bar{t}\bar{\nu_{\tau}} final states. No statistically significant excess above the Standard Model expectation is observed in any channel and scalar leptoquarks are excluded at 95% CL with masses up to mLQ1m_{\mathrm{LQ1}} < 1050 GeV for first-generation leptoquarks, mLQ2m_{\mathrm{LQ2}} < 1000 GeV for second-generation leptoquarks, mLQ3<m_{\mathrm{LQ3}} < 625 GeV for third-generation leptoquarks in the bΜτbˉΜτˉb\nu_{\tau}\bar{b}\bar{\nu_{\tau}} channel, and 200 <mLQ3<< m_{\mathrm{LQ3}} < 640 GeV in the tΜτtˉΜτˉt\nu_{\tau}\bar{t}\bar{\nu_{\tau}} channel.Comment: 25 pages plus author list + cover pages (42 pages total), 6 figures, 8 tables, submitted to EPJC, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2014-03

    The ATLAS Data Acquisition and High Level Trigger system

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    This paper describes the data acquisition and high level trigger system of the ATLAS experiment at the Large Hadron Collider at CERN, as deployed during Run 1. Data flow as well as control, configuration and monitoring aspects are addressed. An overview of the functionality of the system and of its performance is presented and design choices are discussed

    Search for new phenomena using the invariant mass distribution of same-ïŹ‚avour opposite-sign dilepton pairs in events with missing transverse momentum in√s =13 TeV ppcollisions with the ATLAS detector

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    aJUTS: s We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of EPLANET, ERC, ERDF, FP7, Horizon 2020 and Marie SkƂodowska-Curie Actions, European Union; MINECO, Spain AND CERCA Programme Generalitat de Catalunya.A search for new phenomena in final states containing an or pair, jets, and large missing transverse momentum is presented. This analysis makes use of proton-proton collision data with an integrated luminosity of , collected during 2015 and 2016 at a centre-of-mass energy with the ATLAS detector at the Large Hadron Collider. The search targets the pair production of supersymmetric coloured particles (squarks or gluinos) and their decays into final states containing an or pair and the lightest neutralino () via one of two next-to-lightest neutralino () decay mechanisms: , where the Z boson decays leptonically leading to a peak in the dilepton invariant mass distribution around the Z boson mass; and with no intermediate resonance, yielding a kinematic endpoint in the dilepton invariant mass spectrum. The data are found to be consistent with the Standard Model expectation. Results are interpreted using simplified models, and exclude gluinos and squarks with masses as large as 1.85 and 1.3 at 95% confidence level, respectively
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