Gauge dependence and renormalization of tan β in the MSSM
نویسندگان
چکیده
Well-known and newly developed renormalization schemes for tan β are analyzed in view of three desirable properties: gauge independence, process independence , and numerical stability in perturbation theory. Arguments are provided that no scheme can meet all three requirements, and as an illustration, a " No-Go-Theorem " for the renormalization of tan β is established. Nevertheless, two particularly attractive schemes emerge. A discussion about which scheme might be the best compromise in practice is given.
منابع مشابه
ar X iv : h ep - p h / 02 10 32 4 v 1 2 4 O ct 2 00 2 TU - 672 Two - loop renormalization of tan β and its gauge dependence
Renormalization of two-loop divergent corrections to the vacuum expectation values (v1, v2) of the two Higgs doublets in the minimal supersymmetric standard model, and their ratio tanβ = v2/v1, is discussed for general Rξ gauge fixings. When the renormalized (v1, v2) are defined to give the minimum of the loop-corrected effective potential, it is shown that, beyond the one-loop level, the dimen...
متن کاملTwo-loop renormalization of tanβ and its gauge dependence
Renormalization of two-loop divergent corrections to the vacuum expectation values (v1, v2) of the two Higgs doublets in the minimal supersymmetric standard model, and their ratio tanβ = v2/v1, is discussed for general Rξ gauge fixings. When the renormalized (v1, v2) are defined to give the minimum of the loop-corrected effective potential, it is shown that, beyond the one-loop level, the dimen...
متن کامل/ 99 02 29 0 v 1 1 0 Fe b 19 99 hep - ph / 9902290 Infrared Quasi Fixed Points and Mass Predictions in the MSSM II : Large tan β Scenario
We consider the infrared quasi fixed point solutions of the renormalization group equations for the Yukawa couplings and soft supersymmetry breaking parameters in the MSSM in the large tan β regime. The existence of IR quasi fixed points together with the values of gauge couplings, third generation quarks, lepton and Z-boson masses allows one to predict masses of the Higgs bosons and SUSY parti...
متن کاملNeutrino Masses, Mixing Angles and the Unification of Couplings in the MSSM
In the light of the gathering evidence for νμ − ντ neutrino oscillations, coming in particular from the Super-Kamiokande data on atmospheric neutrinos, we re-analyze the unification of gauge and Yukawa couplings within the minimal supersymmetric extension of the Standard Model (MSSM). Guided by a range of different grand-unified models, we stress the relevance of large mixing in the lepton sect...
متن کاملGauge dependence and renormalization of tan
Renormalization schemes for tan are discussed in view of their gauge dependence. It is shown that several common renormalization schemes lead to a gauge-dependent definition of tan , whereas two classes of gauge-independent schemes show even worse disadvantages. We conclude that the DR-scheme is the best compromise.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2002