Non-Gaussian Corrections to Higgs Mass in Autonomous lambda phi**4
Uwe Ritschel
Abstract
Recent calculations in one-loop and Gaussian appro- ximation, using the so-called autonomous renormalization scheme, indicate a comparatively massive, narrow Higgs excitation at about 2 TeV. Here I show that this result qualitatively persists in the framework of a post-Gaussian variational approximation for the pure O(N)-symmetric phi**4-theory for N>1. The method is based on nonlinear transformations of path-integral variables, and the optimization amounts to a Schwinger-Dyson-type summation of diagrams. In the case of O(4), for example, I find MHiggs = 2.3 TeV, compared to 1.9 TeV and 2.1 TeV in 1-loop and Gaussian approximation, respectively.
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