CalcHEP

Can I use CalcHEP to calculate the neutrino-proton/neutron deep inelastic scattering cross section?

Asked by Qiji Xin

Hi,

I am trying to calculate the cross sections for some processes of neutrino-proton/neutron deep inelastic scattering (DIS).  The proton/neutron is at rest.
For example, νμ  + p → μ + X.
Is it possible to use CalcHEP to do this? If so, how to set up?

Moreover, below are some specific setups that I am not quite sure,
"Enter process:" vm, p → m, X ?
How to set the "X" particle? If I also use composite particle p, then the charge won't conserve. I guess I need to define another composite particle in addition to composite p?

Then, when doing the numerical calculation, I need to choose the PDF for p, which is straightforward.

Then, can I set the "second particle momentum" to be zero, since my proton is at rest?

Thanks so much!

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Alexander Belyaev
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Qiji Xin (xinqijisuper) said : 		#1

Also,

is "second particle momentum" the momentum of the composite p (proton), or the momentum of the quark in the subprocess? I think it is for the proton.

Thanks!

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Best Alexander Belyaev (alexander.belyaev) said : 		#2

You should use

vm, p → m, 1*x

then calchep will generate all subprocesses you need
since 1*x means "any particle"
For more details please read manual or press F11 in the graphical interface mode
Regards
Alexander

On 03/03/2019 19:52, Qiji Xin wrote:
> New question #678916 on CalcHEP:
> https://answers.launchpad.net/calchep/+question/678916
>
> Hi,
>
> I am trying to calculate the cross sections for some processes of neutrino-proton/neutron deep inelastic scattering (DIS).  The proton/neutron is at rest.
 For example, νμ  + p → μ + X.
> Is it possible to use CalcHEP to do this? If so, how to set up?
>
>

Moreover, below are some specific setups that I am not quite sure,
> "Enter process:" vm, p → m, X ?
> How to set the "X" particle? If I also use composite particle p, then the charge won't conserve. I guess I need to define another composite particle in addition to composite p?
>
> Then, when doing the numerical calculation, I need to choose the PDF for p, which is straightforward.
>
 Then, can I set the "second particle momentum" to be zero, since my proton is at rest?
>
> Thanks so much!
>
 --
______________________________________________________________________
Prof. Alexander S Belyaev (<email address hidden>)
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Revision history for this message
Qiji Xin (xinqijisuper) said : 		#3

Thanks Alexander Belyaev, that solved my question.