Gauging chiral tau lepton number with a light X boson of mass about 2.1 GeV explains the Belle II B to K missing-energy excess and survives existing bounds.
Recent Highlights from the Belle II Experiment
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abstract
The Belle II experiment operates at the SuperKEKB asymmetric-energy $e^+e^-$ collider. During the Run 1 data taking, we have collected an integrated luminosity of $424\text{ fb}^{-1}$ of collision data at the energy near the $\Upsilon (4S)$ resonance. We present highlights of recent Belle II results on measurements of rare $B$ decays, tests of lepton flavour universality, and measurements that contribute to the determination of the Cabibbo-Kobayashi-Maskawa unitarity triangle and the muon anomalous magnetic moment.
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Gauged $\tau$-lepton chiral currents and $B \to K^{(*)} E_{\rm miss}$
Gauging chiral tau lepton number with a light X boson of mass about 2.1 GeV explains the Belle II B to K missing-energy excess and survives existing bounds.