Evidence for tttt production in the multilepton final state in proton-proton collisions at s=13 TeV with the ATLAS detector

Evidence for tttt production in the multilepton final state in proton-proton collisions at s=13 TeV with the ATLAS detector

A search is presented for four-top-quark production using an integrated luminosity of 139 fb-1 of proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the LHC. Events are selected if they contain a same-sign lepton pair or at least three leptons (elect...

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Veröffentlicht in:The European physical journal. C, Particles and fields Particles and fields, 2020, Vol.80 (11), Article 1085
Hauptverfasser: Aad, G., Abbott, B., Abbott, D. C., Abud, A., Abeling, K., Abhayasinghe, D. K., Abidi, S. H., AbouZeid, O. S., Abraham, N. L., Abramowicz, H., Abreu, H., Abulaiti, Y., Acharya, B. S., Achkar, B., Adachi, S., Adam, L., Bourdarios, Adam C., Adamczyk, L., Adamek, L., Adelman, J., Adersberger, M., Adiguzel, A., Adorni, S., Adye, T., Affolder, A. A., Afik, Y., Agapopoulou, C., Agaras, M. N., Aggarwal, A., Agheorghiesei, C., Aguilar-Saavedra, J. A., Ahmadov, F., Ahmed, W. S., Ai, X., Aielli, G., Akatsuka, S., Akesson, T. P. A., Akilli, E., Akimov, A. V., Al Khoury, K., Alberghi, G. L., Albert, J., Alconada Verzini, M. J., Alderweireldt, S., Aleksa, M., Aleksandrov, I. N., Alexa, C., Alexandre, D., Alexopoulos, T., Alfonsi, A., Alfonsi, F., Alhroob, M., Ali, B., Alimonti, G., Alison, J., Alkire, S. P., Allaire, C., Allbrooke, B. M. M., Allen, B. W., Allport, P. P., Aloisio, A., Alonso, A., Alonso, F., Alpigiani, C., Alshehri, A. A., Alvarez Estevez, M., Alvarez Piqueras, D., Alviggi, M. G., Amaral Coutinho, Y., Ambler, A., Ambroz, L., Amelung, C., Amidei, D., Amor Dos Santos, S. P., Amoroso, S., Amrouche, C. S., An, F., Anastopoulos, C., Andari, N., Andeen, T., Anders, C. F., Anders, J. K., Andreazza, A., Andrei, V., Anelli, C. R., Angelidakis, S., Angerami, A., Anisenkov, A. V., Annovi, A., Antel, C., Anthony, M. T., Antonelli, M., Antrim, D. J. A., Anulli, F., Aoki, M., Aparisi Pozo, J. A., Aperio Bella, L., Arabidze, G., Araque, J. P., Araujo Ferraz, V.
Format: Artikel
Sprache:eng
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Physical Sciences
Physics
Physics, Particles & Fields
Science & Technology
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Zusammenfassung:A search is presented for four-top-quark production using an integrated luminosity of 139 fb-1 of proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the LHC. Events are selected if they contain a same-sign lepton pair or at least three leptons (electrons or muons). Jet multiplicity, jet flavour and event kinematics are used to separate signal from the background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The four-top-quark production cross section is measured to be 24-6+7 fb. This corresponds to an observed (expected) significance with respect to the background-only hypothesis of 4.3 (2.4) standard deviations and provides evidence for this process.
ISSN:1434-6044
1434-6052
1434-6052
DOI:10.1140/epjc/s10052-020-08509-3