6533b7d1fe1ef96bd125cf16
RESEARCH PRODUCT
Gauge-invariant top-quark form-factors from e(+)e(-) experiments
J. PapavassiliouC. Parrinellosubject
High Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)High Energy Physics::LatticeHigh Energy Physics::PhenomenologyFOS: Physical sciencesFísicadescription
Motivated by the possibility of experimental determination of top quark form factors in upcoming e+ e- experiments, as recently discussed by Atwood and Soni, we show at the one loop level that the conventionally defined magnetic dipole moment (MDM) form factor of the top quark is gauge dependent, in the class of renormalizable ($R_{\xi}$) gauges. We explicitly calculate its gauge dependence, which, due to the massiveness of the top quark, turns out to be numerically very sizable. We show how to use the S-matrix pinch technique in order to define gauge independent form factors. The real and imaginary parts of the gauge independent MDM form factor are calculated and their dependence on the top quark and Higgs boson masses is discussed. Most noticeably, the dependence on the Higgs mass turns out to be stronger than that of the cross section as a whole.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1993-11-12 |