Abstract
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 D0\pi+ 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.
Highlights
Leptons constitute a crucially important sector of elementary particles
We do not know if they are Dirac or Majorana particles, the latter case characterized by being their own antiparticles [1]
An impressive lower limit from neutrinoless double decays in nuclei has already been obtained on the half-life of Oð1025Þ years [3] for coupling to eÀ
Summary
Searches for heavy Majorana neutrinos in BÀ decays in final states containing hadrons plus a ÀÀ pair have been performed using 0:41 fbÀ1 of data collected with the LHCb detector in proton-proton collisions at a center-of-mass energy of 7 TeV. The DþÀÀ and DÃþÀÀ final states can arise from the presence of virtual Majorana neutrinos of any mass. Other final states containing þ, Dþs , or D0þ 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 on the BÀ decay branching fractions
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