[Rivet] Analyses with partonic centre of mass energy?

[Adam Makda]

Hello,

I'm a student relatively new to Rivet and C++ in general.

I'm currently using Rivet to analyse pp -> t tbar (stable top quark pair
production at LHC13). I want to be able to project out the partons' (within
the proton) centre of mass energy. This is usually denoted as
$\sqrt{\hat{s}}$ in LaTeX.

I'm aware of a projector called 'Beams' but this only projects out
$\sqrt{s}$ ie. in my simulations, 13 TeV.

I was wondering if there is an example within the existing analyses I could
use as a template in order to project out the initial state partons in an
event and extract their energies?

Any help will be appreciated. If this isn't the purpose of this contact
email address, is there anyone who could help?

Thanks

Adam Makda
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