Observation of $WWW$ Production in $pp$ Collisions at $\sqrt s$ =13  TeV with the ATLAS Detector

This Letter reports the observation of $WWW$ production and a measurement of its cross section using 139 fb$^{-1}$ of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. Events with two same-sign leptons (electrons or muons)...

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Published in:Physical review letters Vol. 129; no. 6
Main Authors: Aad, G., Abbott, B., Abbott, D.C., Abed Abud, A., Abeling, K., Abhayasinghe, D.K., Abidi, S.H., Aboulhorma, A., Abramowicz, H., Abreu, H., Abulaiti, Y., Abusleme, Angel, Acharya, B.S., Achkar, B., Adam, L., Adam Bourdarios, C., Adamczyk, L., Adamek, L., Addepalli, S.V., Adelman, J., Adiguzel, A., Adorni, S., Adye, T., Affolder, Tony, Affolder, A.A., Afik, Y., Agapopoulou, C., Agaras, M.N., Agarwala, J., Aggarwal, A., Agheorghiesei, C., Aguilar-Saavedra, J.A., Ahmad, A., Ahmadov, F., Ahmed, W.S., Ai, X., Aielli, G., Aizenberg, I., Akbiyik, M., Åkesson, T.P.A., Akimov, A.V., Al Khoury, K., Alberghi, G.L., Albert, J., Albicocco, P., Alconada, Josefina, Alderweireldt, S., Aleksa, M., Alexandrov, Igor, Alexa, C., Alexopoulos, T., Alfonsi, A., Alfonsi, F., Alhroob, M., Ali, B., Ali, S., Aliev, M., Alimonti, G., Allaire, C., Allbrooke, B.M.M., Allport, P.P., Aloisio, A., Alonso, F., Alpigiani, C., Alunno Camelia, E., Alvarez Estevez, M., Alviggi, M.G., Amaral Coutinho, Y., Ambler, A., Ambroz, L., Amelung, C., Amidei, D., Amor dos Santos, S.P., Amoroso, S., Amos, K.R., Amrouche, C.S., Ananiev, V., Anastopoulos, C., Andari, N., Andeen, T., Anders, J.K., Andrean, S.Y., Andreazza, A., Angelidakis, S., Angerami, A., Anisenkov, A.V., Annovi, A., Antel, C., Anthony, M.T., Antipov, E., Antonelli, M., Antrim, D.J.A., Anulli, F., Aoki, M., Aparisi Pozo, J.A., Aparo, M.A., Aperio Bella, L., Aranzabal, N., Araujo Ferraz, V., Arcangeletti, C.
Format: Journal Article
Language:English
Published: American Physical Society 01-08-2022
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Summary:This Letter reports the observation of $WWW$ production and a measurement of its cross section using 139 fb$^{-1}$ of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. Events with two same-sign leptons (electrons or muons) and at least two jets, as well as events with three charged leptons, are selected. A multivariate technique is then used to discriminate between signal and background events. Events from $WWW$ production are observed with a significance of 8.0 standard deviations, where the expectation is 5.4 standard deviations. The inclusive $WWW$ production cross section is measured to be $820 \pm 100\,\text{(stat)} \pm 80\,\text{(syst)}$ fb, approximately 2.6 standard deviations from the predicted cross section of $511 \pm 18$ fb calculated at next-to-leading-order QCD and leading-order electroweak accuracy.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.129.061803