660 research outputs found

    Measurement of the total cross section and Ļ -parameter from elastic scattering in pp collisions at āˆšs=13 TeV with the ATLAS detector

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    Studies of new Higgs boson interactions through nonresonant HH production in the bĀÆbĪ³Ī³ fnal state in pp collisions at āˆšs = 13 TeV with the ATLAS detector

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    A search for nonresonant Higgs boson pair production in the b ĀÆbĪ³Ī³ fnal state is performed using 140 fbāˆ’1 of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. This analysis supersedes and expands upon the previous nonresonant ATLAS results in this fnal state based on the same data sample. The analysis strategy is optimised to probe anomalous values not only of the Higgs (H) boson self-coupling modifer ĪŗĪ» but also of the quartic HHV V (V = W, Z) coupling modifer Īŗ2V . No signifcant excess above the expected background from Standard Model processes is observed. An observed upper limit ĀµHH < 4.0 is set at 95% confdence level on the Higgs boson pair production cross-section normalised to its Standard Model prediction. The 95% confdence intervals for the coupling modifers are āˆ’1.4 < ĪŗĪ» < 6.9 and āˆ’0.5 < Īŗ2V < 2.7, assuming all other Higgs boson couplings except the one under study are fxed to the Standard Model predictions. The results are interpreted in the Standard Model efective feld theory and Higgs efective feld theory frameworks in terms of constraints on the couplings of anomalous Higgs boson (self-)interactions

    Measurement of exclusive pion pair production in protonā€“proton collisions at āˆšs=7 TeV with the ATLAS detector

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    The Compact Linear Collider (CLIC) - 2018 Summary Report

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    Comparison of inclusive and photon-tagged jet suppression in 5.02 TeV Pb+Pb collisions with ATLAS

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    Search for pairs of muons with small displacements in pp collisions at root s=13 TeV with the ATLAS detector

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    Measurement of the nuclear modification factor of b-jets in 5.02Ā TeV Pb+Pb collisions with the ATLAS detector

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    Search for resonant WZ production in the fully leptonic final state in protonā€“proton collisions at āˆšs=13 TeV with the ATLAS detector

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