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

• Published in: Physics letters. B Vol. 796; no. C; pp. 68 - 87
• Main Authors: Andeen, T., Anisenkov, A.V., Atmani, H., Bajic, M., Baker, O.K., Bartoldus, R., Beck, H.P., Bogavac, D., Bressler, S., Bruschi, M., Buzykaev, A.R., Camarero Munoz, D., Campanelli, M., Carter, J.W.S., Chen, J., Cheung, K., Chisholm, A.S., Ciungu, B.M., Connell, S.H., Cowan, G., Dawe, E., De Vasconcelos Corga, K., Deiana, A.M., Deliot, F., Derue, F., Desch, K., Deterre, C., Drechsler, E., Estrada Pastor, O., Gardner, R.W., Gaycken, G., Geisen, J., Gerlach, L.O., Grancagnolo, S., Gravili, F.G., Grevtsov, K., Grivaz, J.-F., Guo, J., Guo, Y., Hansen, J.B., Hayes, C., Henkelmann, S., Hessey, N.P., Hönle, A., Hostiuc, A., Iturbe Ponce, J.M., Jakobi, K.B., Kamenshchikov, A., Kano, Y., Kataoka, Y., Katzy, J., Kazanin, V.F., Kempster, J.J., Khubua, J., Kobel, M., Kozanecki, W., Krasznahorkay, A., Krauss, D., Kulchitsky, Y., La Rotonda, L., Lee, C.A., Lewis, D.J., Loch, P., Lopez Solis, A., Lou, X., Luehring, F., McKay, M.A., Meloni, F., Mikenberg, G., Moa, T., Morgenstern, S., Naryshkin, I., Ouchrif, M., Paredes Hernandez, D., Passaggio, S., Pauly, T., Phillips, P.W., Pianori, E., Pizzimento, L., Primavera, M., Read, A.L., Rizatdinova, F., Sato, K., Schleicher, K.E., Scutti, F., Shrestha, S., Sidoti, A., Soffa, A.M., Soffer, A., Stamen, R., Todt, S., Troncon, C., Trzebinski, M., Tsybychev, D., Vigani, L., Wengler, T., Wieseotte, N., Zhang, G., Zhu, Y., Zobernig, G.
• Format: Journal Article
• Language: English
• Published: United States Elsevier B.V 10-09-2019; Elsevier; North-Holland
• Subjects: Ciências Físicas; Ciências Naturais; Fysik; Natural Sciences; Naturvetenskap; Physical Sciences; Science & Technology; Subatomic Physics; Subatomär fysik
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2019.07.016

A search for high-mass dielectron and dimuon resonances in the mass range of 250GeV to 6TeV is presented. The data were recorded by the ATLAS experiment in proton–proton collisions at a centre-of-mass energy of s=13TeV 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 4.5TeV for the E6-motivated Zψ′ boson. Also presented are limits on Heavy Vector Triplet model couplings.