Study of Z pair production and anomalous couplingsin e + e- collisions at $\sqrt{s}$ between 190 GeV and 209 GeV期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Study of Z pair production and anomalous couplingsin e + e- collisions at $\sqrt{s}$ between 190 GeV and 209 GeV

Authors:	The OPAL Collaboration

Institution:	(1) University of Geneva,

Abstract:	A study of Z-boson pair production in e⁺ e^- annihilation at center-of-mass energies between 190 GeV and 209 GeV is reported. Final states containing only leptons, ( $\ell^{ + }\ell^{-}\ell^{ + }\ell^{-}$ and $\ell^{ + }\ell^{-}\nu\overline{\nu}$ ), quark and lepton pairs, ( $\mathrm{q \bar{q}}\ell^{ + }\ell^{-}$ , $\mathrm{q \bar{q}}\nu\overline{\nu}$ ) and only hadrons ( $\mathrm{q \bar{q}}\mathrm{q \bar{q}}$ ) are considered. In all states with at least one Z boson decaying hadronically, lifetime, lepton and event-shape tags are used to separate $\mathrm{b \bar{b}}$ pairs from $\mathrm{q \bar{q}}$ final states. Limits on anomalous ZZ $\gamma$ and ZZZ couplings are derived from the measured cross sections and from event kinematics using an optimal observable method. Limits on low scale gravity with large extra dimensions are derived from the cross sections and their dependence on polar angle.Received: 14 July 2003, Published online: 18 December 2003

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