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By Jean-Paul Pier

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125, 397 (1962). 14 What lies beyond the Standard Model? 1 Examples of quadratically divergent Feynman graphs contributing to the corrections to the Higgs boson mass in the Standard Model. where 12 comes from 12 possible field contractions. We see that this correction is quadratically divergent. Mass corrections are more conventionally computed by evaluating the correction to the scalar propagator. We will do so in Chapter 3 for scalar fields in a simple supersymmetric model introduced therein, and see that, once again, there are quadratically divergent contributions to the scalar boson mass.

Majorana ψ (and ψ) The integration over the intermediate points z and z can be performed by writing the Fourier expansions of each of the propagators. One then finds that the correction from the fermion loop in Fig. 2 is given by, g2 d4 p 1 e−i p(x−y) 4 2 (2π) p − m 2A 1 d4 q 1 Tr 4 (2π) (q/ − m ψ ) (− p/ + q/ − m ψ ) p2 1 . − m 2A From the second diagram where the fields A(x) and A(y) can be contracted in two ways we get, −i g2 2 2 d4 z D FA (x − z)D FA (z − y)D FB (z − z), while the third diagram for which we have twelve possible contractions yields, −i g2 12 4 d4 z D FA (x − z)D FA (z − y)D FA (z − z).

Fahri and L. Susskind, Phys. Rep. 74, 277 (1981) and K. Lane, hep-ph/0202255. 3 What could the New Physics be? 17 Construction of realistic models with massive fermions requires the introduction of yet other extended technicolor interactions. The simplest models predict flavorchanging neutral current processes at unacceptably large rates. More complicated technicolor theories can be constructed to avoid these problems, but the models become cumbersome and are often in conflict with data involving precision electroweak measurements.

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