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from Part III - Weak Decays in the StandardModel
Published online by Cambridge University Press: 11 June 2020
We will next go beyond the SM. It will be strategically useful to present first the general structure of effective Hamiltonians beyond the SM and identify new operators that are absent in the SM. This chapter will deal with physics at the electroweak scale and below it as we already encountered in previous chapters but now particular emphasis will be put on new operatorsgenerated by some NP at much higher scale that at the electroweak scale, and below it they will contribute to various processes. What will be discussed here is the low-energy effective theory that carries the name LEFT to distinguish it from the effective theory discussed in the next chapter. Here the basic symmetries for finding possible operators is simply the product SU(3)*U(1), that are the symmetries of QCD and QED. Simply the color and electric charges have to be conserved.
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