MadGraph5_aMC@NLO

how to calculate subprocesses of parton-parton scattering

Asked by Steven Jeremies

Hello,

I want to calculate the cross section of those processes in a p-p scattering which include a top quark in the final state, namely
u b > d t, c b > s t, anti d b > anti u, anti s b > anti c t. What does the input in this case look like that I have to put after 'generate' ?
Thanks in advance!

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Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

I would simply do

import model sm-no_b_mass # to pass in a five flavor computation
generate p p > t j

Cheers,

Olivier

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Steven Jeremies (minits) said : 		#2

Thanks Olivier Mattelaer, that solved my question.

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Doris Mulcahy (gmontson13) said (last edit ): 		#3

We investigate the potential to observe double parton scattering at the Large Hadron Collider in p p -> W b bbar X -> l nu b bbar X at 7 TeV.
 Our analysis tests the efficacy of several kinematic variables in isolating the double parton process of interest from the single parton process and relevant backgrounds for the first 10 inverse fb of integrated luminosity.
These variables are constructed to expose the independent nature of the two subprocesses in double parton scattering, pp -> l nu X and pp -> b bbar X.
 We use next-to-leading order perturbative predictions for the double parton and single parton scattering components of W b bbar and for the pertinent backgrounds.

The next-to-leading order contributions are important for a proper description of some of the observables we compute. We find that the double parton process can be identified and measured with significance S/sqrt(B) ~ 10, provided the double parton scattering effective cross section sigma_{eff} ~ 12 mb.