Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-11-09
Nucl.Phys.B442:461-471,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages; all figures are now included in a uuencoded file
Scientific paper
10.1016/0550-3213(95)00127-E
In a generic Grand Unified Theory with a relatively small dispersion of the spectrum around the $Z$-boson and the unification masses, a connection is established, exact at one loop level, between $M_Z$, $G_{\rm F}$, $\alpha(M_Z)$ and the strong coupling constant $\alpha_3(M_Z)$. At this level of precision, this avoids the logical and phenomenological inconsistency of predicting $\alpha_3(M_Z)$ by means of the electroweak couplings as extracted from the data in the Standard Model rather than in the complete theory. Attention is paid to the independence of the physical results from regularization and/or renormalization schemes. As a particularly relevant example, the analysis is specialized to the case of the Minimal Supersymmetric Standard Model, with emphasis on light charginos and neutralinos.
Barbieri Riccardo
Ciafaloni Paolo
Strumia Alessandro
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