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Search for a narrow, spin-2 resonance decaying to a pair of Z bosons in the qqℓ^+ℓ^− final state

By S. Chatrchyan, A. Apresyan, A. Bornheim, Y. Chen, E. Di Marco, J. Duarte, M. Gataullin, Y. Ma, A. Mott, H. B. Newman, C. Rogan, M. Spiropulu, V. Timciuc, J. Veverka, R. Wilkinson, S. Xie, Y. Yang, R. Y. Zhu, F. A. Dias and M. Dubinin


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 μ^+μ^−) 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 fb^(−1) 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 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

Publisher: Elsevier
Year: 2013
OAI identifier:
Provided by: Caltech Authors

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