Measurement of the ZZ production cross section and limits on anomalous neutral triple gauge couplings in proton-proton collisions at sqrt[s] = 7 TeV with the ATLAS detector

A measurement of the ZZ production cross section in proton-proton collisions at sqrt[s] = 7 TeV using data corresponding to an integrated luminosity of 1.02 fb(-1) recorded by the ATLAS experiment at the LHC is presented. Twelve events containing two Z boson candidates decaying to electrons and/or m...

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Veröffentlicht in:	Physical review letters 2012-01, Vol.108 (4), p.041804-041804
Hauptverfasser:	Aad, G, Abbott, B, Abdallah, J, Abdelalim, A A, Abdesselam, A, Abdinov, O, Abi, B, Abolins, M, Abramowicz, H, Abreu, H, Acerbi, E, Acharya, B S, Adams, D L, Addy, T N, Adelman, J, Aderholz, M, Adomeit, S, Adragna, P, Adye, T, Aefsky, S, Aguilar-Saavedra, J A, Aharrouche, M, Ahlen, S P, Ahles, F, Ahmad, A, Ahsan, M, Aielli, G, Akdogan, T, Akesson, T P A, Akimoto, G, Akimov, A V, Akiyama, A, Alam, M S, Alam, M A, Albert, J, Albrand, S, Aleksa, M, Aleksandrov, I N, Alessandria, F, Alexa, C, Alexander, G, Alexandre, G, Alexopoulos, T, Alhroob, M, Aliev, M, Alimonti, G, Alison, J, Aliyev, M, Allport, P P, Allwood-Spiers, S E, Almond, J, Aloisio, A, Alon, R, Alonso, A, Alvarez Gonzalez, B, Alviggi, M G, Amako, K, Amaral, P, Amelung, C, Ammosov, V V, Amorim, A, Amorós, G, Amram, N, Anastopoulos, C, Ancu, L S, Andari, N, Andeen, T, Anders, C F, Anders, G, Anderson, K J, Andreazza, A, Andrei, V, Andrieux, M-L, Anduaga, X S, Angerami, A, Anghinolfi, F, Anjos, N, Annovi, A, Antonaki, A, Antonelli, M, Antonov, A, Antos, J, Anulli, F, Aoun, S, Aperio Bella, L, Apolle, R, Arabidze, G, Aracena, I, Arai, Y, Arce, A T H, Archambault, J P, Arfaoui, S, Arguin, J-F, Arik, E, Arik, M, Armbruster, A J, Arnaez, O, Artamonov, A, Artoni, G, Arutinov, D
Format:	Artikel
Sprache:	eng
Schlagworte:	fysik High Energy Physics - Experiment Physics
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Zusammenfassung:	A measurement of the ZZ production cross section in proton-proton collisions at sqrt[s] = 7 TeV using data corresponding to an integrated luminosity of 1.02 fb(-1) recorded by the ATLAS experiment at the LHC is presented. Twelve events containing two Z boson candidates decaying to electrons and/or muons are observed, with an expected background of 0.3 ± 0.3(stat)(-0.3)(+0.4)(syst) events. The cross section measured in a phase-space region with good detector acceptance and for dilepton masses within the range 66 to 116 GeV is σ(ZZ → ℓ+ ℓ- ℓ+ ℓ-)(fid) = 19.4(-5.2)(+6.3)(stat)(-0.7)(+0.9)(syst) ± 0.7(lumi) fb. The resulting total cross section for on-shell ZZ production, σ(ZZ)(tot) = 8.5(-2.3)(+2.7)(stat)(-0.3)(+0.4)(syst) ± 0.3(lumi) pb, is consistent with the standard model expectation of 6.5(-0.2)(+0.3) pb calculated at the next-to-leading order in QCD. Limits on anomalous neutral triple gauge boson couplings are derived.
ISSN:	0031-9007 1079-7114 1079-7114
DOI:	10.1103/PhysRevLett.108.041804