Effective lagrangian description of top production and decay

Details Effective lagrangian description of top production and decay Effective lagrangian description of top production and decay

1996-06-26

arxiv.org/abs/hep-ph/9606435v2

Phys.Rev. D54 (1996) 6861-6882

Physics

High Energy Physics

High Energy Physics - Phenomenology

36 pages (9 figures available through email in .uu form, e-mail: renard@lpmsun2.lpm.univ-montp2.fr)

Scientific paper

10.1103/PhysRevD.54.6861

We propose a rather general description of residual New Physics (NP) effects on the top quark couplings. These effects are described in terms of 20 gauge invariant $dim=6$ operators involving gauge and Higgs bosons as well as quarks of the third family. We compute their implications for the $\gamma t\bar t$, $Z t \bar t$ and $tbW$ vertices and study their observability in the process $e^-e^+ \to t\bar t$ with $t\to bW \to b\ell^+\nu_\ell$. We present results for the integrated cross section, the angular distribution and various decay distribution and polarization asymmetries for NLC energies of $0.5-2~TeV$. Observability limits are discussed and interpreted in terms of the NP scales associated to each operator through the unitarity constraints. The general landscape of the residual NP effects in the heavy quark and bosonic sectors is also presented.

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