Analysis for magnetic moment and electric dipole moment form factors of the top quark viae+e−→tt¯

Abstract

Phenomenological analysis for determining the magnetic moment and electic dipole moment form factors of the top quark via the reaction ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}tt\ifmmode\bar\else\textasciimacron\fi{}, followed by the decays t\ensuremath{\rightarrow}${\mathit{bW}}^{+}$ and t\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}b\ifmmode\bar\else\textasciimacron\fi{}${\mathit{W}}^{\mathrm{\ensuremath{-}}}$, is presented, with analytic expressions for the differential cross section and decay given. Various experimental observables are studied and their efficacy for the determination of form factors is considered and compared with the optimal resolution of form factors in the tt\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\gamma} and tt\ifmmode\bar\else\textasciimacron\fi{}Z vertices. We find that with a sample of 10000 events it is possible to put limits of ${10}^{\mathrm{\ensuremath{-}}18}$--${10}^{\mathrm{\ensuremath{-}}19}$ e cm for the form factors considered, evaluated at ${\mathit{q}}^{2}$=s when \ensuremath{\surd}s \ensuremath{\approxeq}500 GeV.