From multileg loops to trees (by-passing Feynman's Tree Theorem)
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From multileg loops to trees (by-passing Feynman's Tree Theorem)

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From multileg loops to trees (by-passing Feynman's Tree Theorem)

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Rodrigo García, Germán Vicente; Catani, Stefano; Gleisberg, Tanju; Krauss, Frank; Winter, Jan-Christopher
Aquest document és un/a article, creat/da en: 2008
We illustrate a duality relation between one-loop integrals and single-cut phase-space integrals. The duality relation is realised by a modification of the customary +i0 prescription of the Feynman propagators. The new prescription regularizing the propagators, which we write in a Lorentz covariant form, compensates for the absence of multiple-cut contributions that appear in the Feynman Tree Theorem. The duality relation can be extended to generic one-loop quantities, such as Green's functions, in any relativistic, local and unitary field theories.

    Rodrigo García, Germán Vicente Catani, Stefano Gleisberg, Tanju Krauss, Frank Winter, Jan-Christopher 2008 From multileg loops to trees (by-passing Feynman's Tree Theorem) Nuclear Physics B-Proceedings Supplements 183 262 267
http://dx.doi.org/10.1016/j.nuclphysbps.2008.09.114
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