der. (ii) working in the MS renormalization scheme with renormalization scale p, and (iii) in the tenor- malizable class of gauges (Re) as follows: Vergh ) = 0 °)(h) + 1,(1)(h) . (Al) The tree-level potential is V(o)(h) = 4 —h4 , (A2) and we can neglect the O(h°) and O(h2) terms for the pur- pose