Implementation of double-charged scalar

Asked by João Paulo Pinheiro on 2020-11-17

Hello. Im having a implementation problem. Im trying to implement a double charged scalar in SM. I made a check and was ok. However, when I have tried to calculate the Decay width of T++, there was a warning (n_calchep was not calculated). Why is this happening?
This is the model's link.
(https://drive.google.com/file/d/14cV7NhWEiCD9DnoTsQ9FLET38I-1GDo9/view?usp=sharing)

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Alexander Pukhov (pukhov) said :
#1

All decay channels of T++ are zero at symbolic level.

Best

     Alexander Pukhov

On 17.11.2020 21:31, João Paulo Pinheiro wrote:
> Question #694057 on CalcHEP changed:
> https://answers.launchpad.net/calchep/+question/694057
>
> Description changed to:
> Hello. Im having a implementation problem. Im trying to implement a double charged scalar in SM. I made a check and was ok. However, when I have tried to calculate the Decay width of T++, there was a warning (n_calchep was not calculated). Why is this happening?
> This is the model's link.
> (https://drive.google.com/file/d/14cV7NhWEiCD9DnoTsQ9FLET38I-1GDo9/view?usp=sharing)
>

Revision history for this message
Alexander Belyaev (alexander.belyaev) said :
#2

Dear João Paulo,

you did not introduce hermitian conjugated vertices for T++
for example
you have T++ e e

but do not have T--T-- E E

That is why your width at symbolic level is zeo as pointed by Alexander Pukhov

Best
Alexander Belyaev

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