TY - JOUR
T1 - Bottom quark mass prediction in supersymmetric grand unification
T2 - Uncertainties and constraints
AU - Langacker, Paul
AU - Polonsky, Nir
PY - 1994
Y1 - 1994
N2 - Grand unified theories often predict unification of Yukawa couplings (e.g., hb=hτ), and thus certain relations among fermion masses. The latter can distinguish these from models that predict only coupling constant unification. The implications of Yukawa couplings of the heavy family in the supersymmetric extension of the standard model (when embedded in a GUT) are discussed. In particular, uncertainties associated with mt and mt, threshold corrections at the low-scale, and threshold and nonrenormalizable-operator corrections associated with a grand-unified sector at the high-scale are parametrized and estimated. The implications of these and of the correlation between mt and the prediction for αs are discussed. Constraints on the tanβ range in such models and an upper bound on the t-quark pole mass are given and are shown to be affected by the αs-mt correlation. Constraints on the low-scale thresholds are found to be weakened by uncertainties associated with the high scale.
AB - Grand unified theories often predict unification of Yukawa couplings (e.g., hb=hτ), and thus certain relations among fermion masses. The latter can distinguish these from models that predict only coupling constant unification. The implications of Yukawa couplings of the heavy family in the supersymmetric extension of the standard model (when embedded in a GUT) are discussed. In particular, uncertainties associated with mt and mt, threshold corrections at the low-scale, and threshold and nonrenormalizable-operator corrections associated with a grand-unified sector at the high-scale are parametrized and estimated. The implications of these and of the correlation between mt and the prediction for αs are discussed. Constraints on the tanβ range in such models and an upper bound on the t-quark pole mass are given and are shown to be affected by the αs-mt correlation. Constraints on the low-scale thresholds are found to be weakened by uncertainties associated with the high scale.
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U2 - 10.1103/PhysRevD.49.1454
DO - 10.1103/PhysRevD.49.1454
M3 - Article
AN - SCOPUS:4243309849
SN - 1550-7998
VL - 49
SP - 1454
EP - 1467
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
IS - 3
ER -