polarized amplitude or helicity amplitude

Asked by Zafer ALTIN

Dear Belyaev,
I haven't got much experience in CalcHEP. I'm interested in polarized cross-section for scattering process but I couldn't find any information and samples. I choose Photon, Photon -> X,X
1. For polarization A%, A% -> X,X
I controlled the Mathematica code amplitudes depend on Helicity.
Helicity N1 Helicity N2
is this helicity amplitude?
Left or right handed option or polarized amplitude?
I'm sorry my question is not a good question. I haven't enough theoretical background.

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Alexander Pukhov (pukhov) said :
#1

Mathematica output contains parameters

Helicity1, Helicity2 and N_p1p2_ .
First 2 parameters are helicities of first and second incoming particles.

N_p1p2_ is a normalization factor which has to be equal to 1/p1.p2.
Here there are two problems with current version of CalcHEP:
a) name N_p1p2_ is not good for Mathematica because it terminated by
underscore symbol.
b) substitution for N_p1p2_ is not implemented.

Please use updated version. It still has name calchep_3.6.27 but dated
August 26.

Best
   Alexander Pukhov

On 08/23/2016 11:07 PM, Zafer ALTIN wrote:
> New question #360068 on CalcHEP:
> https://answers.launchpad.net/calchep/+question/360068
>
> Dear Belyaev,
> I haven't got much experience in CalcHEP. I'm interested in polarized cross-section for scattering process but I couldn't find any information and samples. I choose Photon, Photon -> X,X
> 1. For polarization A%, A% -> X,X
> I controlled the Mathematica code amplitudes depend on Helicity.
> Helicity N1 Helicity N2
> is this helicity amplitude?
> Left or right handed option or polarized amplitude?
> I'm sorry my question is not a good question. I haven't enough theoretical background.
>

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