[Rivet] Accessing partonic quantities

[Daniel Rauch]

Dear Rivet authors,

is it possible to access parton-level information even in showered and 
hadronized events?
More concrete: Is there a way of directly getting top-quark quantities, 
e.g. like pT, eta, etc., even after its decay?
By directly I mean: other than reconstructing the top quark from b-jets 
and W candidates in the analysis.

Many thanks for your efforts!
Daniel Rauch