Abstract
The observed deviations from the Standard Model in several b→sμμ processes can be explained in terms of a new vector boson produced on-shell in B meson decays. A mass of 2.5–3 GeV and a total width of 10–20% allow to hide the associated dimuon bump in the poorly known charmonium region, and the large invisible decay width can be interpreted in terms of Dark Matter. This proposal predicts a contribution to the muon anomalous magnetic moment, that could explain the long-standing tension with the Standard Model. It also predicts sizeable invisible B decays and a peculiar q2-dependence of the lepton flavor universality ratios RK and RK⁎, that could be tested at the LHCb and Belle-II. This proceeding is based on [F. Sala, D. M. Straub, A New Light Particle in B Decays?, Phys. Lett. B774 (2017) 205–209. arXiv:1704.06188, doi:10.1016/j.physletb.2017.09.072], and slightly extends it with comments about Dark Matter.
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