Majorana Like mass term for a doublet a fermion

Question how to implement a model or how to change a model implementation
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najimuddin
Posts: 30
Joined: 4. Oct 2016, 14:54

Majorana Like mass term for a doublet a fermion

Post by najimuddin » 12. Nov 2019, 07:45

Hi,
I am trying to write a model with an extra Fermion doublet and a triplet scalar.
FermionFields[[1]] = {F, 3, {conj[vF], conj[eF]}, 1/2, -2, 1};
ScalarFields[[1]] = {trip2, 1, {{T2p/Sqrt[2],-T2pp},{T20,-T2p/Sqrt[2]}}, 1, 3, 1};

From Y F.trip2.F, term I got the mass term YtM VeVtrip conj[vF].conj[vF].

I want to add this term M F.F, I didn't get the mass term due to eptiolon in the product. I have written the term M Delta[lef1,lef2] F.F, it gives the mass term and I can see this in the mathematica output.
However, a error message is coming during MakeSPheno output:

Calculate Beta Functions for bilinear Fermion interactions
Calculating DynamicProgressRGE[MFIJ]/1.(DynamicCoupProgess[MFIJ])
Power::infy: Infinite expression 1/0 encountered.
Infinity::indet: Indeterminate expression 0 ComplexInfinity encountered.
Power::infy: Infinite expression 1/0 encountered.
Infinity::indet: Indeterminate expression 0 ComplexInfinity encountered.
Power::infy: Infinite expression 1/0 encountered.
General::stop: Further output of Power::infy will be suppressed during this calculation.
Infinity::indet: Indeterminate expression 0 ComplexInfinity encountered.
General::stop: Further output of Infinity::indet will be suppressed during this calculation.
Part::partw: Part 1 of {} does not exist.
Part::partw: Part 1 of {} does not exist.
Part::partw: Part 1 of {} does not exist.
General::stop: Further output of Part::partw will be suppressed during this calculation.

The M term in the matrix is also absent in the Tex (PDF) file.

Is there anything missing in this term?
Thank you for your answer.

FStaub
Site Admin
Posts: 822
Joined: 13. Apr 2016, 14:05

Re: Majorana Like mass term for a doublet a fermion

Post by FStaub » 15. Jan 2020, 21:11

Hi,

M Delta[lef1,lef2] F.F

is forbidden by hypercharge conservation, isn't it?

Cheers,
Florian

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