CalcHEP

writing of the azimuthal angle

Asked by Ribella

Hi,

I make a cross-sectional account in the CalcHEP. For this cross section, I have to write deltaφ expression ( it is the azimuthal angle difference between two particles) in the cuts section.

How can I write it?

Thanks,

Murat

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Launchpad Janitor (janitor) said : 		#1

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

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Alexander Pukhov (pukhov) said : 		#2

In Calchep we have implemented the following cuts related to azimuth
angle difference

   D - min(T1^2,T2^2)*(cosh(eta_12)-cos(phi_12))
         where T1,T2 - transverce momena, eta_12 - pseudo-rapidity
         difference, phi_12 - azimuth angle difference.
   J - Delta R jet separation = sqrt(|eta_12|^2 +|phi_12|^2)
   K - |eta_12|

You see, azimuth parameter phi_12 is included in other cuts, but not
appear independently.
One can include it as "userCut". Here some small programming is
needed. See manual. I can help you in case of problem.

Sorry for delayed answer.

Best
    Alexander Pukhov

On 02/23/2017 10:38 AM, Murat wrote:
> New question #478081 on CalcHEP:
> https://answers.launchpad.net/calchep/+question/478081
>
> Hi,
>
> I make a cross-sectional account in the CalcHEP. For this cross section, I have to write deltaφ expression ( it is the azimuthal angle difference between two particles) in the cuts section.
>
> How can I write it?
>
>
> Thanks,
>
> Murat
>

Revision history for this message
Alexander Belyaev (alexander.belyaev) said : 		#3

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