Numerical evaluation of a two loop diagram in the cutoff regularization
Ji-Feng Yang, Jie Zhou, Chen Wu
Abstract
The sunset diagram of λϕ4 theory is evaluated numerically in cutoff scheme and a nonzero finite term (in accordance with dimensional regularization (DR) result) is found in contrast to published calculations. This finding dramatically reduces the critical couplings for symmetry breaking in the two loop effective potential discussed in our previous work.
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