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The off-shell anomalous chromomagnetic dipole moment of the standard model quarks ($u$, $d$, $s$, $c$ and $b$), at the $Z$ gauge boson mass scale, is computed by using the $overline{textrm{MS}}$ scheme. The numerical results disagree with all the previous predictions reported in the literature and show a discrepancy of up to two orders of magnitude in certain situations.
We note that off the quark mass shell the operators $(p_i+p_f)_mugamma_5$ and $isigma_{mu u}(p_i -p_f)^ ugamma_5$, both of which reduce to $-vec{sigma}cdotvec{E}$ in the non-relativistic limit, are no longer identical. In this paper we explore the ef
We explore the physics of a new neutral gauge boson, ($Z^prime$), coupling to only third-generation particles with a mass near the electroweak gauge boson mass poles. A $Z^prime$ boson produced by top quarks and decaying to tau leptons is considered.
The NuTeV collaboration has performed precision measurements of the ratio of neutral current to charged current cross-sections in high rate, high energy neutrino and anti-neutrino beams on a dense, primarily steel, target. The separate neutrino and a
We analyse the associated production of Higgs and $Z$ boson via heavy-quark loops at the LHC in the Standard Model and beyond. We first review the main features of the Born $2to 2$ production, and in particular discuss the high-energy behaviour, angu