# Search for Majorana neutrinos in $B^- \to \pi^+\mu^-\mu^-$ decays

Abstract : A search for heavy Majorana neutrinos produced in the $B^- \to \pi^+\mu^-\mu^-$ decay mode is performed using 3 fb$^{-1}$ of integrated luminosity collected with the LHCb detector in $pp$ collisions at center-of-mass energies of 7 TeV and 8 TeV at the LHC. Neutrinos with masses in the range 250-5000 MeV and lifetimes from zero to 1000 ps are probed. In the absence of a signal, upper limits are set on the branching fraction ${\cal{B}}(B^- \to \pi^+\mu^-\mu^-)$ as functions of neutrino mass and lifetime. These limits are on the order of $10^{-9}$ for short neutrino lifetimes of 1 ps or less. Limits are also set on the coupling between the muon and a possible fourth-generation neutrino.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00934432
Contributor : Danielle Cristofol <>
Submitted on : Wednesday, January 22, 2014 - 9:12:52 AM
Last modification on : Monday, July 26, 2021 - 4:12:02 PM

### Citation

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Ziad Ajaltouni, et al.. Search for Majorana neutrinos in $B^- \to \pi^+\mu^-\mu^-$ decays. Physical Review Letters, American Physical Society, 2014, 112, pp.131802. ⟨10.1103/PhysRevLett.112.131802⟩. ⟨in2p3-00934432⟩

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