Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-01-24
Phys.Rev.D52:451-458,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages (e-mail renard@lpmsun2.lpm.univ-montp2.fr
Scientific paper
10.1103/PhysRevD.52.451
We establish the most general parametrization of the new physics tested by present precision measurements and possibly responsible for any deviation of the $Z\to b \bar b $ amplitude from its Standard Model result, under the assumption that it is CP symmetric and is induced by degrees of freedom which are too heavy to be ~directly produced at the future Colliders. This is achieved by writing the complete list of the $SU(3)_c\times SU(2) \times U(1) $ gauge invariant and CP symmetric $dim=6$ operators, involving only quarks of the third family and/or bosons. The quark ~containing operators are divided into two classes, according to whether they involve the $t_R$ field or not. Each class contains 14 quark operators. We then proceed to derive the constraints from present precision measurements, on the first class of the 14 $t_R$ involving operators. We show that the $Zb \bar b$ vertex plays a fundamental role to discriminate not only between these operators, but also between this whole scheme and an alternative one like \eg\@ an MSSM description with light chargino and neutral Higgs.
Gounaris G. J.
Renard Fernand M.
Verzegnassi Claudio
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