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I'm trying insert this scattering into FeynArts as kaon decay (Up quark and anti strange quark to anti muon and neutrino ):

enter image description here

but can't figure out why no field enter into 2->2 topologies

InsertFields[topo, {F[3, {1}], -F[4, {2}]} ->
{-F[2, {2}], F[1, {2}]},InsertionLevel -> {Classes}
, Model -> "SM"]

any idea how to fix this?

is there any other way to simulate kaon decay?

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You need to enable CKM mixing first. E.g.

<< FeynArts`

$FAVerbose = 0;
$CKM = True;

tops = CreateTopologies[0, 2 -> 2];
diags = InsertFields[
   tops, {F[3, {1}], -F[4, {2}]} -> {-F[2, {2}], F[1, {2}]}, 
   InsertionLevel -> {Classes}];
Paint[diags, ColumnsXRows -> {2, 1}, SheetHeader -> None,  
  Numbering -> None, ImageSize -> {512, 256}];

enter image description here

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