CalcHEP

the luminosity in Weizsaecker-Williams approximation

Asked by Ribella

Hi,

I will examine the main process e E--->e gam* gam* E -> e W-W+ E through subprocess gam* gam* -> W-W+ with the Weizsaecker-Williams approximation in linear colliders.

Does this approach take into account effective γγ luminosity when calculating the cross-section in CalcHEP?

Sincerly Yours,

Murat

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Alexander Pukhov (pukhov) said : 		#1

You  calculate A,A->W+,W- in CalcHEP and use  distribution function  "
Equivalent Photon" (Weizsacker-Wlliams)

photons assuming that they are  produced by electron. In this case
luminosity is defined by luminosity of electron beam.

We have absolute;y the same situation as  for   QCD  partons.

Best

     Alexander Pukhov

On 13.02.2019 11:28, Murat wrote:
> New question #678520 on CalcHEP:
> https://answers.launchpad.net/calchep/+question/678520
>
> Hi,
>
> I will examine the main process e E--->e gam* gam* E -> e W-W+ E through subprocess gam* gam* -> W-W+ with the Weizsaecker-Williams approximation in linear colliders.
>
> Does this approach take into account effective γγ luminosity when calculating the cross-section in CalcHEP?
>
> Sincerly Yours,
>
>
> Murat
>

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

Hello Murat,
the short answer on your question -- YES it does
Regards
Alexander Belyaev

Revision history for this message
Ribella (ribella) said : 		#3

Hi, Belyaev and Pukhov,
This solved my problem.
Sincerely yours,

Muray