Soft gluons in t t~ production

Asked by Yoav Afik on 2021-03-11

Dear experts,

I have a short question regarding soft gluons in t t~ production.
Assuming I generate my process as follows:
generate p p > t t~ [QCD]

I was wondering if soft gluons effects are considered in the process for the spin correlation between the top pair.
If not, I was wondering how would it be possible to test this effect.

Many thanks,

Yoav.

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Solved by:
Yoav Afik
Solved:
2021-03-21
Last query:
2021-03-21
Last reply:
2021-03-16

Could you be more specific in your question?

For events@NLO the polarization information for a given event is not specified.
But you can check in the FKS paper how soft gluon are handle for the computation at NLO and all the associated counter-term present in the computation.

If you are interested in the top decay, then the paper/code of interest is Madspin, which is actually doing such decay at LO and there the effect of soft-gluon will be partly lost event if the H-event are handle with the real matrix-element (up to a threshold for very soft H-event)

Cheers,

Olivier

Yoav Afik (yoavafik) said : #2

Hi Olivier,

I just wanted to know if radiation is considered in the setup that I use for the spin correlation between the tops.
Given that I also use MadSpin (sorry for not mentioning it before), I have the answer.

Thanks for your help.

Best,

Yoav.