Name: Pengfu Tian Date: 05/27/19-02:33:24 PM Z
dear developers:
I did a calculation about quark loop contribution to the process of
Higgs decay to gluons.
There are two questions that I want to ask.
the 1st is that mathematica is always warning me about
“PolarizationSum::notmassless: Warning! You are inserting a
polarization sum for massless vector bosons, but the momentum of the
external boson Subscript[p, 1] is not on-shell. Please put it
on-shell via ScalarProduct[Subscript[p, 1],Subscript[p,
1]]=0” but actually I’ve done onshell definition in the
bigining.
the 2nd one is that the result of my calculation is
“(\[Alpha]
\!\(\*SubsuperscriptBox[\(m\), \(q\), \(4\)]\)
\!\(\*SubsuperscriptBox[\(\[Alpha]\), \(s\),
\(2\)]\) (\!\(
\*SubsuperscriptBox[\(m\), \(h\), \(2\)] - \(4\
\*SubsuperscriptBox[\(m\), \(q\), \(2\)]\)\))^2
\!\(TraditionalForm\`
\*SubscriptBox\(“C”\), \(“0”\)\)^2)/(4
\[Pi]^2
Subscript[m, h]
\!\(\*SubsuperscriptBox[\(m\), \(W\), \(2\)]\)
\!\(\*SubsuperscriptBox[\(s\), \(W\), \(2\)]\))”
but actually the result should be
”(\[Alpha]
\!\(\*SubsuperscriptBox[\(m\), \(q\), \(4\)]\)
\!\(\*SubsuperscriptBox[\(\[Alpha]\), \(s\),
\(2\)]\) ((\!\(
\*SubsuperscriptBox[\(m\), \(h\), \(2\)] - \(4\
\*SubsuperscriptBox[\(m\), \(q\), \(2\)]\)\))^2
\!\(TraditionalForm\`
\*SubscriptBox\(“\<C\>”\), \(“\<0\>”\)\) - 2)^2)/(4
\[Pi]^2
Subscript[m, h]
\!\(\*SubsuperscriptBox[\(m\), \(W\), \(2\)]\)
\!\(\*SubsuperscriptBox[\(s\), \(W\), \(2\)]\))”
In fact，some annotaion about Functions related to “PaVe” on page
https://feyncalc.github.io/reference are gone.
Are those functions whose annotation have disappeared just be
abandoned?
Thanks for your help!
Best regards!
Pengfu Tian