Abstract
Leptonic B decays provide theoretically clean probes that are sensitive to physics beyond the standard model. These decays can be accessed at high luminosity \(e^+e^-\) colliders operating near the \(\varUpsilon (4S)\) resonance, where kinematic constraints and the nearly \(4\pi \) solid angle coverage of the Belle and BaBar detectors allow for clean measurements of final states that involve non-interacting particles. Charged B decays to lepton pairs will be reviewed, with emphasis on two recent Belle measurements. In addition, a search for the flavour-changing neutral-current decay \(B^-\rightarrow \varLambda \overline{p}\nu \overline{\nu }\) from BaBar will be presented.
Bob Kowalewski—On behalf of the Belle and BaBar collaborations.
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\(\cos \theta _{B,D^{(*)}\ell } = (2E_{beam}E_{D^{(*)}\ell }-m_B^2-m_{D^{(*)}\ell }^2) / (2p_B^* p_{D^{(*)}\ell }^*)\) where all quantities are in the CM frame and \(p_B^*\) is the nominal B meson momentum calculated from the beam energy \(E_{beam}\) and the nominal mass \(m_B\).
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Kowalewski, B. (2019). Leptonic \(B\) Decays at the \(e^+e^-\ B\) Factories. In: Giri, A., Mohanta, R. (eds) 16th Conference on Flavor Physics and CP Violation. FPCP 2018. Springer Proceedings in Physics, vol 234. Springer, Cham. https://doi.org/10.1007/978-3-030-29622-3_1
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DOI: https://doi.org/10.1007/978-3-030-29622-3_1
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