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Dear All,

Can anyone enlighten me as to how to handle complex infinities that arise in tadpole diagrams involving massless particles? For instance the following calculation in QED:

tops = CreateTopologies[1, 1 -> 1];

ins = InsertFields[tops[[2]], F[1, {1}] -> F[1, {1}], Model -> QED,

InsertionLevel -> {Particles}];

CreateFeynAmp[ins]

Produces three diagrams whose amplitudes involve 'ComplexInfinity' due to the zero mass of the photon. How should these diagrams be handled by FeynArts/FeynCalc?

Many thanks

Jon

**Next message:**Kiniu: "Using (Math( ˆcommand-interface˜ instead of (Mathematica( ˆGraphical User Interface˜"**Previous message:**Maurits: "installation of feyncalc on winxp machine"**Next in thread:**rolf mertig: "Re: Infinite Tadpoles"**Reply:**rolf mertig: "Re: Infinite Tadpoles"**Maybe reply:**Vladyslav Shtabovenko: "Re: Infinite Tadpoles"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]**Mail actions:**[ respond to this message ] [ mail a new topic ]

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