Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-11-12
Phys.Rev.D50:3059-3075,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
32 pages, 2 uuencoded dvi files, preprint NYU--TH--93/05/02
Scientific paper
10.1103/PhysRevD.50.3059
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.
Papavassiliou Joannis
Parrinello Claudio
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