Search for a narrow spin-2 resonance decaying to a pair of Z vector bosons in the semileptonic final state

Abstract : Results are presented from a search for a narrow, spin-2 resonance decaying into a pair of Z bosons, with one Z-boson decaying into leptons (e+e- or mu+mu-) and the other into jets. An example of such a resonance is the Kaluza--Klein graviton, G[KK], predicted in Randall--Sundrum models. The analysis is based on a 4.9 inverse femtobarn sample of proton-proton collisions at a center-of-mass energy of 7 TeV, collected with the CMS detector at the LHC. Kinematic and topological properties, including decay angular distributions as a novel feature of the analysis, are used to discriminate between signal and background. No evidence for a resonance is observed, and upper limits on the production cross sections times branching fractions are set. In two models that predict Z-boson spin correlations in graviton decays, graviton masses are excluded lower than a value which varies between 610 and 945 GeV, depending on the model and the strength of the graviton couplings.
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Journal articles
Physics Letters B, Elsevier, 2013, 718, pp.1208-1228. <10.1016/j.physletb.2012.11.063>


http://hal.in2p3.fr/in2p3-00733598
Contributor : Sylvie Florès <>
Submitted on : Wednesday, September 19, 2012 - 9:00:17 AM
Last modification on : Thursday, March 7, 2013 - 7:00:46 AM

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S. Chatrchyan, M. Besancon, S. Choudhury, M. Dejardin, D. Denegri, et al.. Search for a narrow spin-2 resonance decaying to a pair of Z vector bosons in the semileptonic final state. Physics Letters B, Elsevier, 2013, 718, pp.1208-1228. <10.1016/j.physletb.2012.11.063>. <in2p3-00733598>

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