t' production at the LHC

Use Madgraph / MadEvent to calculate the $t'\bar t'$ and t-channel $t'j$ production cross sections at the LHC for different $m_{t'}$.

1.

How do the cross section change with $m_{t'}$? Which one is dominating at low and high $m_{t'}$?

2.

Consider the case where the CKM matrix is not diagonal and the off-diagonal elements involving the $t'$ and light quarks are not small. How do the results for production change? How do the BR's change?

-- Main.FabioMaltoni - 28 Aug 2008