Searches for heavy Majorana neutrinos in B- decays in final states containing
hadrons plus a mu- mu- pair have been performed using 0.41/fb of data
collected with the LHCb detector in proton-proton collisions at a
center-of-mass energy of 7 TeV. The D+ mu- mu- and D*+ mu- mu- final states
can arise from the presence of virtual Majorana neutrinos of any mass. Other
final states containing pi+, Ds+, or D0pi+ can be mediated by an on-shell
Majorana neutrino. No signals are found and upper limits are set on Majorana
neutrino production as a function of mass, and also on the B- decay branching
fractions.
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