ElectroWeak precision data: the minimal set of parameters

Details ElectroWeak precision data: the minimal set of parameters ElectroWeak precision data: the minimal set of parameters

2006-05-24

arxiv.org/abs/hep-ph/0605265v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

To appear in the proceedings of the XLIst Rencontres de Moriond, ElectroWeak interactions and unified theories

Scientific paper

We show how precision electroweak data, assuming CP conservation and flavor universality, despite being sensitive to 20 dimension 6 operators, constrain severely only 9 combinations of them. We define a set of 7 oblique parameters $\hat S, \hat T, \hat U, V, X,W,Y$ which fully describe corrections to the leptonic observables. We add two additional parameters $\delta \epsilon_q, \delta C_q$ to take into account the most precise hadronic observables. Another parameter $\delta \epsilon_b$ is considered for the bottom quark if flavor universality is not assumed for the third generation of quarks. We show that the approximation is extremely satisfactory testing it on a set of random new physics models and on some famous $Z'$ gauge bosons.

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