[Comphep-common] 2HDM process production

[Slava Bunichev]

Dear Ijaz,

By default CompHEP does not includes such loop vertices as the:
h->gg, h->gamma,gamma ... etc.
but you can insert them yourself (the expressions for them can be found in
a large number of works, for example: arXiv: 1309.5410 [hep-ph])
It is also very convenient to use LanHEP
(http://theory.sinp.msu.ru/~semenov/lhep319.tgz)
for deriving corresponding Feynman rules in the CompHEP-format.

Best regards,
Viacheslav.




>
> Hi comphep experts:
>
>  I am studying pp-->A-->ZH0 process in the 2HDM implemented by my own in
> comphep using MSSM model, as i could not find by default 2HDM in comphep,
> if there is let me inform.
> My question is that at LHC the dominant production cross-section fo this
> channel is through gluon-gluon fusion, while here in comphep using
> colliding beams of pb-pb, which contains virtual bottom quarks and gluons
> in =side proton beams, but among the fynman diagrams i could not find such
> diagram which produce this process by gluon fusion, please anybody can
> help me.
>
> Without including gluon fusion in comphep the total cross-section obtained
> at LHC 14Tev for C scenario, for this channel is extremely small, while it
> is around few tens of femto barn generated by SuSHi. I could not
> understand this problem also. I want to know contribution of bb and gg in
> the total production cross-section excluding other diagram. Anyone can
> enlighten me.
>
> Usually my sample generation process in few hundred thousands is very time
> consuming during running on standalone comphep at local PC, any method to
> run much faster way?
>
> Cross-section obtained by adopting procedure ; producing process.dat and
> then ./symb calculation then numerical calculation ,  and obtained by
> graphical interface must be same??
> cheers
> Ijaz
>
> thanks
>
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