Search for high-mass dilepton resonances using 139 fb−1 of pp collision data collected at s=13 TeV with the ATLAS detector

doi:10.1016/j.physletb.2019.07.016

Physics Letters B

Volume 796, 10 September 2019, Pages 68-87

https://doi.org/10.1016/j.physletb.2019.07.016 Get rights and content

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Abstract

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 $\sqrt{s} = 13$ 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 E₆-motivated $Z_{ψ}^{'}$ boson. Also presented are limits on Heavy Vector Triplet model couplings.

Cited by (0)

^a: Also at Centre for High Performance Computing, CSIR Campus, Rosebank, Cape Town; South Africa.

^b: Also at CERN, Geneva; Switzerland.

^c: Also at CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille; France.

^d: Also at Département de Physique Nucléaire et Corpusculaire, Université de Genève, Genève; Switzerland.

^e: Also at Departament de Fisica de la Universitat Autonoma de Barcelona, Barcelona; Spain.

^f: Also at Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Lisboa; Portugal.

^g: Also at Department of Applied Physics and Astronomy, University of Sharjah, Sharjah; United Arab Emirates.

^h: Also at Department of Financial and Management Engineering, University of the Aegean, Chios; Greece.

ⁱ: Also at Department of Physics and Astronomy, University of Louisville, Louisville, KY; United States of America.

^j: Also at Department of Physics and Astronomy, University of Sheffield, Sheffield; United Kingdom.

^k: Also at Department of Physics, California State University, East Bay; United States of America.

^l: Also at Department of Physics, California State University, Fresno; United States of America.

^m: Also at Department of Physics, California State University, Sacramento; United States of America.

ⁿ: Also at Department of Physics, King's College London, London; United Kingdom.

^o: Also at Department of Physics, St. Petersburg State Polytechnical University, St. Petersburg; Russia.

^p: Also at Department of Physics, Stanford University, Stanford CA; United States of America.

^q: Also at Department of Physics, University of Adelaide, Adelaide; Australia.

^r: Also at Department of Physics, University of Fribourg, Fribourg; Switzerland.

^s: Also at Department of Physics, University of Michigan, Ann Arbor MI; United States of America.

^t: Also at Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow; Russia.

^u: Also at Giresun University, Faculty of Engineering, Giresun; Turkey.

^v: Also at Graduate School of Science, Osaka University, Osaka; Japan.

^w: Also at Hellenic Open University, Patras; Greece.

^x: Also at Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona; Spain.

^y: Also at Institut für Experimentalphysik, Universität Hamburg, Hamburg; Germany.

^z: Also at Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen; Netherlands.

^aa: Also at Institute for Nuclear Research and Nuclear Energy (INRNE) of the Bulgarian Academy of Sciences, Sofia; Bulgaria.

^ab: Also at Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Budapest; Hungary.

^ac: Also at Institute of High Energy Physics, Chinese Academy of Sciences, Beijing; China.

^ad: Also at Institute of Particle Physics (IPP); Canada.

^ae: Also at Institute of Physics, Academia Sinica, Taipei; Taiwan.

^af: Also at Institute of Physics, Azerbaijan Academy of Sciences, Baku; Azerbaijan.

^ag: Also at Institute of Theoretical Physics, Ilia State University, Tbilisi; Georgia.

^ah: Also at Instituto de Fisica Teorica, IFT-UAM/CSIC, Madrid; Spain.

^ai: Also at Istanbul University, Dept. of Physics, Istanbul; Turkey.

^aj: Also at Joint Institute for Nuclear Research, Dubna; Russia.

^ak: Also at LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay; France.

^al: Also at Louisiana Tech University, Ruston LA; United States of America.

^am: Also at LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris; France.

^an: Also at Manhattan College, New York NY; United States of America.

^ao: Also at Moscow Institute of Physics and Technology State University, Dolgoprudny; Russia.

^ap: Also at National Research Nuclear University MEPhI, Moscow; Russia.

^aq: Also at Physics Department, An-Najah National University, Nablus; Palestine.

^ar: Also at Physics Dept, University of South Africa, Pretoria; South Africa.

^as: Also at Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg; Germany.

^at: Also at School of Physics, Sun Yat-sen University, Guangzhou; China.

^au: Also at The City College of New York, New York NY; United States of America.

^av: Also at The Collaborative Innovation Center of Quantum Matter (CICQM), Beijing; China.

^aw: Also at Tomsk State University, Tomsk, and Moscow Institute of Physics and Technology State University, Dolgoprudny; Russia.

^ax: Also at TRIUMF, Vancouver BC; Canada.

^ay: Also at Universita di Napoli Parthenope, Napoli; Italy.

^⁎: Deceased.

^⋆: E-mail address: [email protected].