Results 1 - 10 of 16797
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[en] We study the possibility of relaxing the indirect limits on extra neutral vector bosons by their interplay with additional new particles. They can be systematically weakened, even below present direct bounds at colliders, by the addition of more vector bosons and/or scalars designed for this purpose. Otherwise, they appear to be robust.
[en] We show that L1=Le-Lμ, L2=Le-Lτ, and L3=Lμ-Lτ (where Le,μ,τ are the family lepton numbers) are anomaly-free and can thus be gauged. Three simple theories featuring a flavor-conserving second Z boson (Z1,2,3') result. Bounds on the Zi' coupling constant (gi') and mass are derived. The mass of Z1' has a lower bound of 60--150 GeV at 90% confidence level for reasonable values of g1'. The mass of Z2' has a best-fit value of about 60 GeV. The physics of these bosons in the KEK TRISTAN and CERN LEP window of 63--87 GeV is discussed. Constraints on Z3' interactions are derived from (g-2)μ
[en] Recent trilinear gauge boson couplings measurements by the CDF and D0 Collaborations at the Fermilab Tevatron are presented. The measurements were done by analyzing diboson production in multiple decay channels and final states. No deviations from the Standard Model description of the WWZ, WWγ, ZZγ and Zγγ vertices were found. Limits on anomalous gauge couplings set by these analyses are the tightest available to date
[en] We investigate the capability of the NLC to indirectly determine both the mass as well as the couplings to leptons and b-quarks of a new neutral gauge boson below direct production threshold. By using data collected at several different values of the collide center of mass energy, we demonstrate how this can be done in an anonymous and model- independent manner. The procedure can be easily extended to the top and charm quark couplings
[en] Starting from Lorenz invariance and CPT invariance, we write down the most general effective Lagrangian Leff corresponding to the three-vector-boson couplings which are given completely in the Standard Model. 8 refs