4 research outputs found
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Search for supersymmetry in events with b-tagged jets and missing transverse momentum in pp collisions at vs = 13 TeV with the ATLAS detector
A search for the supersymmetric partners of the Standard Model bottom and top quarks is presented. The search uses 36.1 fb-1 of pp collision data at vs = 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. Direct production of pairs of bottom and top squarks (b˜1 and t˜1) is searched for in final states with b-tagged jets and missing transverse momentum. Distinctive selections are defined with either no charged leptons (electrons or muons) in the final state, or one charged lepton. The zero-lepton selection targets models in which the b˜1 is the lightest squark and decays via b˜1 ? b?˜01 , where ˜?01 is the lightest neutralino. The one-lepton final state targets models where bottom or top squarks are produced and can decay into multiple channels, b˜1 ? b?˜01 and b˜1 ? t?˜±1, or t˜1 ? t?˜01 and t˜1? b?˜±1, where ˜?±1 is the lightest chargino and the mass difference m?˜±1 - m?˜01 is set to 1 GeV. No excess above the expected Standard Model background is observed. Exclusion limits at 95% confidence level on the mass of third-generation squarks are derived in various supersymmetry-inspired simplified models
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Search for minimal supersymmetric standard model Higgs Bosons H/A and for a Z' boson in the tt final state produced in pp collisions at sv=13 TeV with the ATLAS detector
A search for neutral Higgs bosons of the minimal supersymmetric standard model (MSSM) and for a heavneutral Z' boson is performed using a data sample corresponding to an integrated luminosity of 3.2fb-1 from proton–proton collisions at s vs=13 TeV recorded by the ATLAS detector at the LHC. The heavy resonance is assumed to decay to a t+t- pair with at least one t lepton decaying to final states with hadrons and a neutrino. The search is performed in the mass range of 0.2–1.2 TeV for the MSSM neutral Higgs bosons and 0.5–2.5 TeV for the heavy neutral Z' boson. The data are in good agreement with the background predicted by the Standard Model. The results are interpreted in MSSM and Z' benchmark scenarios. The most stringent constraints on the MSSM mA–tanß space exclude at 95% confidence level (CL) tanß>7.6 for mA=200 GeV in the mhmod+ MSSM scenario. For the Sequential Standard Model, a Z'SSM mass up to 1.90 TeV is excluded at 95% CL and masses up to 1.82–2.17 TeV are excluded for a Z'SFM of the strong flavour model
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Identification of boosted, hadronically decaying W bosons and comparisons with ATLAS data taken at vs = 8 TeV
This paper reports a detailed study of techniques for identifying boosted, hadronically decaying W bosons using 20.3 fb -¹ of proton–proton collision data collected by the ATLAS detector at the LHC at a centre-of-mass energy vs = 8 TeV. A range of techniques for optimising the signal jet mass resolution are combined with various jet substructure variables. The results of these studies in Monte Carlo simulations show that a simple pairwise combination of groomed jet mass and one substructure variable can provide a 50 % efficiency for identifying W bosons with transverse momenta larger than 200 GeV while maintaining multijet background efficiencies of 2–4 % for jets with the same transverse momentum. These signal and background efficiencies are confirmed in data for a selection of tagging techniques
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Search for new resonances decaying to a W or Z boson and a Higgs boson in the l + l - bb¯, lvbb¯, and vv¯bb¯ channels with pp collisions at vs = 13 TEV with the ATLAS detector
A search is presented for new resonances decaying to a W or Z boson and a Higgs boson in the +-bb¯, ?bb¯, and ?v¯bb¯ channels in pp collisions at vs = 13 TeV with the ATLAS detector at the Large Hadron Collider using a total integrated luminosity of 3.2 fb-1. The search is conducted by looking for a localized excess in the W H/Z H invariant or transverse mass distribution. No significant excess is observed, and the results are interpreted in terms of constraints on a simplified model based on a phenomenological Lagrangian of heavy vector triplets