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The Minimal Left-Right Symmetric Model and Radiative Corrections to the Muon Decay

M. Czakon·J. Gluza·J. Hejczyk
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Abstract

A self-consistent version of the left-right (LR) symmetric model is used to examine tree- as well as one-loop level radiative corrections to the muon decay. It is shown that constraints on the heavy sector of the model parameters are different when going beyond tree-level physics. In fact, in our case, the only useful constraints on the model can be obtained from the one-loop level calculation. Furthermore, corrections coming from the subset of SM particles within the LR model have a different structure from their SM equivalent, e.g. the top quark leading term contribution to $Δρ$ within the LR model is different from its SM counterpart. As a consequence, care must be taken in fitting procedures of models beyond the SM, where usually, only tree-level couplings modified by the SM radiative corrections are considered. This procedure is not always correct.

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M. Czakon, J. Gluza, J. Hejczyk. 2003-01-03. The Minimal Left-Right Symmetric Model and Radiative Corrections to the Muon Decay. https://doi.org/10.1016/s0920-5632(03)80175-5

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