Monday, September 24, 2012

1111.1284 (A. E. Kaloshin et al.)

Top quark as a resonance    [PDF]

A. E. Kaloshin, V. P. Lomov
We suggest the description of the dressed fermion propagator with parity non-conservation in the form with separated positive and negative energy poles. We found general form of the $\gamma$-matrix off-shell projectors and corresponding resonance factors. The parity violation leads to deviation of resonance factors from the naive Breit--Wigner form and to appearance of non-trivial spin corrections. However, for top quark with SM vertex the resonance factor returns to the standard one due to $\Gamma/m\ll1$.
View original: http://arxiv.org/abs/1111.1284

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