MadGraph5_aMC@NLO

setting rapidity question

Asked by John

Hi

In order to take into account particles emitted almost near the beam axis, what value should one use to simulate eta equal to an infinity?

John

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Johan Alwall
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Best Johan Alwall (johan-alwall) said : 		#1

Hello John,

In recent versions of MG5, eta set to -1 is equivalent to no eta cut.

All the best,
Johan

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John (emilio-chae) said : 		#2

I actally have v1.4.8.4. Is it different?

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Olivier Mattelaer (olivier-mattelaer) said : 		#3

Yes, this was introduce in 1.5.0.

Cheers,

Olivier

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John (emilio-chae) said : 		#4

Ok. Since the computer I am using is not a personal computer so I must use 1.4.8.4. Could you please tell me the corresponding value for 1.4.8.4?

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Olivier Mattelaer (olivier-mattelaer) said : 		#5

in 1.4.x we don't have a value which correspond to no cut.
We usually use 100000 when we don't want to make any cut.
You can change this value as high as you want.

Cheers,

Olivier

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John (emilio-chae) said : 		#6

Thanks Johan Alwall, that solved my question.