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Hello folks, while writing the paragraph on X and neutrino four-momentum reconstruction I reviewed the code and the logic and I have a couple of comments: 1) B0rectrk is a bit map and not an index. The way it is implemented right now it is hardwire and relies on the assumption of a single candidate being reconstructed. I think we should do something slightly safer ... 2) in the case of identified leptons in the X system , when reconstructing the X 4-momentum, we assign the electron and muon mass. Since our analysis assumption is that we have only one lepton in the event (and this needs to be true in the signal), would it be wiser to assign the pion mass to these candidate? If there is actually an additional lepton in the background the reconstructed MX will be pulled up, which is not bad... 3) do I read the code correctly that we are using the 2C fit with the equal B mass constraint? Also reading the code it looks like that when you turn the smearing on you turn off this additional constraint. I have no clue what this means (I guess it is a testing configuration) but it sounds wierd ciao ric P.S. I committed a revised version of chapter 3 according to what I think we agreed upon. Let me know if you are not happy with it.