Erratum: Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector (original) (raw)
Related papers
Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector
Journal of High Energy Physics, 2020
A search for new physics with non-resonant signals in dielectron and dimuon final states in the mass range above 2 TeV is presented. This is the first search for non-resonant signals in dilepton final states at the LHC to use a background estimate from the data. The data, corresponding to an integrated luminosity of 139 fb−1, were recorded by the ATLAS experiment in proton-proton collisions at a center-of-mass energy of sqrts\sqrt{s}sqrts s = 13 TeV during Run 2 of the Large Hadron Collider. The benchmark signal signature is a two-quark and two-lepton contact interaction, which would enhance the dilepton event rate at the TeV mass scale. To model the contribution from background processes a functional form is fit to the dilepton invariant-mass spectra in data in a mass region below the region of interest. It is then extrapolated to a high-mass signal region to obtain the expected background there. No significant deviation from the expected background is observed in the data. Upper limit...
Physics Letters B
Search for high-mass dilepton resonances using 139 fb −1 of p p collision data collected at √ s = 13 TeV with the ATLAS detector The ATLAS Collaboration A search for high-mass dielectron and dimuon resonances in the mass range of 250 GeV to 6 TeV is presented. The data were recorded by the ATLAS experiment in proton-proton collisions at a centre-of-mass energy of √ s = 13 TeV during Run 2 of the Large Hadron Collider and correspond to an integrated luminosity of 139 fb −1. A functional form is fitted to the dilepton invariant-mass distribution to model the contribution from background processes, and a generic signal shape is used to determine the significance of observed deviations from this background estimate. No significant deviation is observed and upper limits are placed at the 95% confidence level on the fiducial cross-section times branching ratio for various resonance width hypotheses. The derived limits are shown to be applicable to spin-0, spin-1 and spin-2 signal hypotheses. For a set of benchmark models, the limits are converted into lower limits on the resonance mass and reach 4.5 TeV for the E 6-motivated Z ψ boson. Also presented are limits on Heavy Vector Triplet model couplings.
Journal of High Energy Physics, 2020
A mistake was identified for the paper [1] in the treatment of the radion [2] cross-sections, which resulted in multiple changes: 1. section 4.1 was updated to list the correct cross-sections for the production of a 2 TeV or 3 TeV radion decaying to W W , which are 6.3 fb and 0.61 fb respectively (3.1 fb and 0.30 fb for radion decays to ZZ); 2. the predicted cross-section times branching ratio for radion models was incorrectly stated, and is now correctly listed in table 1 (correcting table 2 from the paper [1]); 3. previously the radion could not be excluded in any mass range due to this mistaken cross-section, while now radion masses are excluded for different mass ranges as fixed in table 2 (correcting table 3 from the paper [1]). Given these fixes, the results now exclude the production of W W + ZZ from the scalar-like radion at the 95% CL in the range 1.3 TeV-3.0 TeV. Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP 3 .
Journal of High Energy Physics, 2012
The ATLAS detector at the Large Hadron Collider is used to search for high-mass resonances decaying to an electron-positron pair or a muon-antimuon pair. The search is sensitive to heavy neutral Z′ gauge bosons, Randall-Sundrum gravitons, Z * bosons, techni-mesons, Kaluza-Klein Z/γ bosons, and bosons predicted by Torsion models. Results are presented based on an analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 4.9 fb−1 in the e + e − channel and 5.0 fb−1 in the μ + μ −channel. A Z ′ boson with Standard Model-like couplings is excluded at 95 % confidence level for masses below 2.22 TeV. A Randall-Sundrum graviton with coupling $ {k \left/ {{{{\overline{M}}_{\mathrm{Pl}}}}} \right.}=0.1 $ is excluded at 95 % confidence level for masses below 2.16 TeV. Limits on the other models are also presented, including Technicolor and Minimal Z′ Models.
Search for Dilepton Resonances in pp Collisions at s√=7 TeV with the ATLAS Detector
This Letter reports on a search for narrow high-mass resonances decaying into dilepton final states. The data were recorded by the ATLAS experiment in pp collisions at s√=7 TeV at the Large Hadron Collider and correspond to a total integrated luminosity of 1.08 (1.21) fb−1 in the e+e− (μ+μ−) channel. No statistically significant excess above the standard model expectation is observed and upper limits are set at the 95% C.L. on the cross section times branching fraction of Z′ resonances and Randall-Sundrum gravitons decaying into dileptons as a function of the resonance mass. A lower mass limit of 1.83 TeV on the sequential standard model Z′ boson is set. A Randall-Sundrum graviton with coupling k/MPl=0.1 is excluded at 95% C.L. for masses below 1.63 TeV.
Search for high mass dilepton resonances in pp collisions at with the ATLAS experiment
2011
Abstract This Letter presents a search for high mass e+ e− or μ+ μ− resonances in pp collisions at View the MathML source at the LHC. The data were recorded by the ATLAS experiment during 2010 and correspond to a total integrated luminosity of∼ 40 pb− 1. No statistically significant excess above the Standard Model expectation is observed in the search region of dilepton invariant mass above 110 GeV.