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arXiv · 2210.10593

Recursion-free solution for two-loop vacuum integrals with "collinear" masses

Andrei I. Davydychev·York Schröder
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Abstract

We investigate the structure of a particular class of massive vacuum Feynman integrals at two loops. This class enjoys the linear relation $m_1+m_2=m_3$ between its three propagator masses, corresponding to zeros of the associated Källén function. Apart from having applications in thermal field theory, the integrals can be mapped onto one-loop three-point functions with collinear external momenta, suggesting the term "collinear" masses. We present a closed-form solution for these integrals, proving that they can always be factorized into products of one-loop cases, for all integer-valued propagator powers.

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Andrei I. Davydychev, York Schröder. 2022-10-26. Recursion-free solution for two-loop vacuum integrals with "collinear" masses. https://doi.org/10.1007/jhep12(2022)047

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