On measurement of helicity parameters in top quark decay
of Physics, State University of New York at Binghamton,
Binghamton, NY 13902-6016, USA
Received: 10 July 2000 / Published online: 8 September 2000 - © Springer-Verlag 2000
To enable an evaluation of future measurements of the helicity parameters for decay in regard to violation, this paper considers the effects of an additional pure-imaginary coupling, or i gi, associated with a specific, single additional Lorentz structure, . Sizable violation signatures can occur for low-effective mass scales (< 320 GeV), but in most cases can be more simply excluded by precision measurement of the probabilities P(WL) and P(bL). Signatures for excluding the presence of violation associated with the two dynamical phase-type ambiguities are investigated.
Copyright Società Italiana di Fisica, Springer-Verlag 2000