[Rivet] Rivet Query

[Debarati Roy]

Hi Experts,
                 I need some feedback regarding an analysis which we are planning to introduce in Rivet. It is a CMS analysis consists of the study of hadronic event shapes (arxiv link :   http://arxiv.org/abs/arXiv:1407.2856).
In this analysis five event shapes are studied, thrust, total jet broadening, total jet mass, total transverse jet mass, jet resolution parameter where each of the event shape variable is calculated by giving the input of final state jets momenta . I found that Rivet already has the thrust projection where jets momenta of an event can be given as input to calculate thrust.  But for other three variables (total jet broadening, total jet mass, total transverse jet mass) I observed that you have a similar but not identical projection named,
https://rivet.hepforge.org/trac/browser/src/Projections/Hemispheres.cc
In this projection you are taking the final state particles to calculate broadening and mass if I am not wrong whereas in this analysis the final state jets momenta are used. So is it possible to  modify the existing projection to be more flexible so that we can run it over the final state jets too? Or is it possible that a different projection with a different name can be added?
 Also here
https://rivet.hepforge.org/trac/browser/include/Rivet/Projections/Hemispheres.hh
I could see that there exists different methods  M2high(), M2low(), M2diff(). Is it possible to introduce M2sum() as per this analysis requirement?

Please let us know.

Thanks,
Debarati
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