Measurement of the pp → ZZ production cross section and constraints on anomalous triple gauge couplings in four-lepton final states at vs=8TeV
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Khachatryan, Vladimir; Brochero Cifuentes, Javier Andrés; Cabrillo Bartolomé, José Ibán; Calderón Tazón, Alicia; Duarte Campderros, Jorge; Fernández García, Marcos; Gómez Gramuglio, Gervasio; Graziano, Alberto; López Virto, María Amparo; Marco de Lucas, Jesús; Marco de Lucas, Rafael José; Martínez Rivero, Celso; Matorras Weinig, Francisco; Muñoz Sánchez, Francisca Javiela; Piedra Gómez, Jonatan; Rodrigo Anoro, Teresa; Rodríguez Marrero, Ana Yaiza; Ruiz Jimeno, Alberto; Scodellaro, Luca; [et al.]Fecha
2015-01Derechos
Atribución 3.0 España
Publicado en
Physics Letters B, Vol. 740, Pp. 250–272, (2015)
Editorial
Elsevier
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Resumen/Abstract
A measurement of the inclusive ZZ production cross section and constraints on anomalous triple gauge couplings in proton–proton collisions at vs=8 TeV are presented. The analysis is based on a data sample, corresponding to an integrated luminosity of 19.6fb-1, collected with the CMS experiment at the LHC. The measurements are performed in the leptonic decay modes ZZ ? lll’l’, where l =e, µand ll=e, µ, t. The measured total cross section s(pp ?ZZ) =7.7 ±0.5(stat)+0.5-0.4(syst)±0.4 (theo) ±0.2(lumi) pb, for both Z bosons produced in the mass range 60 <mZ<120GeV, is consistent with standard model predictions. Differential cross sections are measured and well described by the theoretical predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZand ZZ?couplings at the 95% confidence level: -0.004 <fZ4<0.004, -0.004 <fZ5<0.004, -0.005 <f?4<0.005, and -0.005 <f?5<0.005.
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