Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-12-30
Int.J.Mod.Phys.A12:723-742,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, Plain TeX, 10 Tables, 3 Figures, Analysis extended to include universal corrections to all NC quark couplings (such
Scientific paper
10.1142/S0217751X97000591
We analyze LEP and SLC data from the 1995 Summer Conferences as well as from low energy neutral current experiments for signals of new physics. The reasons for doing this are twofold, first to explain the deviations from the standard model observed in $R_b$ and $R_c$ and second to constrain non-standard contributions to couplings of the $Z^0$ boson to all fermions and to the oblique parameters. We do so by comparing the data with the Standard Model as well as with a number of test hypotheses concerning the nature of the new physics. These include non-standard $Zb\bar{b}$-, $Zc\bar{c}$- and $Zs\bar{s}$-couplings as well as the couplings of the $Z^0$ to fermions of the entire first, second and third generations and universal corrections to all up- and down-type quark couplings (as can arise \eg\ in $Z'$ mixing models). We find that non-standard $Zb\bar{b}$ couplings are both necessary and sufficient to explain the data and in particular the $R_b$ anomaly. It is not possible to explain $R_b$, $R_c$ and a value of the strong coupling constant consistent with low energy determinations invoking only non-standard $Zb\bar{b}$- and $Zc\bar{c}$-couplings. To do so one has to have also new physics contributions to the $Zs\bar{s}$ or universal corrections to all $Zq\bar{q}$ couplings.
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