Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 88: Flavorphysik III

T 88.6: Vortrag

Donnerstag, 28. März 2019, 17:20–17:35, S15

Search for heavy Majorana neutrinos in semileptonic B meson decays at the LHCb experiment — •Leon Carus, Eluned Smith, and Christoph Langenbruch — RWTH Aachen

The origin of neutrino masses is still one of the most puzzling unsolved problems of modern particle physics. The Standard Model (SM) assumes neutrinos to be Dirac fermions. Alternative models trying to explain the observation of neutrino oscillations are including neutrinos that are Majorana fermions, meaning that they are their own anti-particles. A striking experimental signature of Majorana neutrinos would be lepton number violating (LNV) processes, which are forbidden in the Standard Model. A search for LNV B meson decays with two same-sign leptons in the final state could be sensitive to new heavy Majorana neutrinos. The LHCb experiment is an ideal environment for these measurements, due to the large bb acceptance, and excellent tracking and particle identification capabilities. This talk presents the current status of the search for the LNV decays B⁺ → µ⁺ µ⁺ π⁻ and B_c⁺ → µ⁺ µ⁺ π⁻ using Run 1 and 2 data, which probes different Majorana neutrino lifetimes and masses up to 6 GeV.