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Asked by bota

Dear Prof
I want to calculate the cross section for the process e+E->e+E+ne+Ne.
my question is: I have to use Pdf. (If ISR & Beam is chosen, then the following beam parameters may be
specified:
Bunch x+y sizes (nm) : 550
Bunch length (mm) : 0.45
Number of particles : 2.1E+10)
because the error is big and i take the cut for E(e) =10 Gev and E(E) .
yours

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Alexander Pukhov (pukhov) said : 		#1

Bunch parameters depends on experiment.
I don't know which experiments are planned now for e^+,e^-.
You definitely need PT cut for produced e^+,e^-.
But for 10GeV bunch effects and ISR effect are not important.
For energy several hundreds ( like LEP ) it is enough to use ISR
distribution function.

Best
    Alexander Pukhov

On 05/07/2016 05:52 PM, bota wrote:
> New question #293426 on CalcHEP:
> https://answers.launchpad.net/calchep/+question/293426
>
> Dear Prof
> I want to calculate the cross section for the process e+E->e+E+ne+Ne.
> my question is: I have to use Pdf. (If ISR & Beam is chosen, then the following beam parameters may be
> specified:
> Bunch x+y sizes (nm) : 550
> Bunch length (mm) : 0.45
> Number of particles : 2.1E+10)
> because the error is big and i take the cut for E(e) =10 Gev and E(E) .
> yours
>

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