Finding cross section of a given process in 2HDM
Hello,
I have generated some Monte Carlo samples using MadGraph_aNLO, Version 2.3.3 for ttX (tt -> semileptonic + dileptonic decays, X->uu) for studying the 2HDM+Scalar model, and I am trying to check if the phenomenology papers regarding this model, is in line with what was generated, by comparing the predicted production cross-section of the ttX process. Below is a short snippet of my JobOptions file, here h3 refers to X -
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import model 2HDM
define p = g u c d s u~ c~ d~ s~
define j = g u c d s u~ c~ d~ s~
define l+ = e+ mu+
define l- = e- mu-
define vl = ve vm
define vl~ = ve~ vm~
generate g g > t t~ h3, (h3 > mu+ mu-),(t > W+ b, W+ > l+ vl),(t~ > W- b~, W- > j j)
add process g g > t t~ h3, (h3 > mu+ mu-),(t > W+ b, W+ > j j),(t~ > W- b~, W- > l- vl~)
add process g g > t t~ h3, (h3 > mu+ mu-),(t > W+ b, W+ > l+ vl),(t~ > W- b~, W- > l- vl~)
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I can find the respective cross-sections for the three processes defined above in the log.generate file, as shown below, and I am trying to back-calculate the production cross-section of the ttX process for a given luminosity, for my analysis. I am getting stuck at the branching ratio of X->uu taken into account when calculating the values below. I have looked it up in the param card, but I am not sure I understand it completely. The idea would be to place limits on the BR (X->uu), and consider it as 1 and let it float, hence I would like to figure of the production CS of ttX and scale it to the current luminosity value, to place meaningful upper limits on BR (X->uu).
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number xsec (pb) xerr (pb) xmax (pb)
1 1.1937e-05 2.4015e-08 1.3443e-09
2 1.1917e-05 2.3975e-08 1.3443e-09
3 4.0091e-06 8.0657e-09 1.3443e-09
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Also, I would like to know the value of k-factor used in the above NLO calculations, and where I can find some more information within the various EVNT and log files, about the same.
Please let me know if you would need more details.
Thank you very much.
Best,
Shreya Saha
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