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Moved vertex fit from signal B to Upsilon(4S) and added IP constraint as well as…

Felix Metzner requested to merge FEATURE/adding_ip_and_mass_constraint_to_vertex_fits into master

Moved vertex fit from signal B to Upsilon(4S) and added IP constraint as well as mass constraint for the D and D* mesons for this tree fit.

@welsch, this is a first step towards the approach suggested by Florian. As he also points out in his lecture, that these changes should improve the resolution of the m_{Miss}^2 distribution, I would guess, that the mass constrains should also affect the momenta of the daughters, meaning that updateAllDaughters should be set to True. I did not do so, yet, as Florian also once pointed out that this would introduce biases.

Edited by Felix Metzner

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