Challenges in semileptonic B decays

Gambino, P. et al. (2020) Challenges in semileptonic B decays. European Physical Journal C, 80(10), 966. (doi: 10.1140/epjc/s10052-020-08490-x)

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Abstract

Two of the elements of the Cabibbo–Kobayashi–Maskawa quark mixing matrix, |Vub| and |Vcb|, are extracted from semileptonic B decays. The results of the B factories, analysed in the light of the most recent theoretical calculations, remain puzzling, because for both |Vub| and |Vcb| the exclusive and inclusive determinations are in clear tension. Further, measurements in the τ channels at Belle, Babar, and LHCb show discrepancies with the Standard Model predictions, pointing to a possible violation of lepton flavor universality. LHCb and Belle II have the potential to resolve these issues in the next few years. This article summarizes the discussions and results obtained at the MITP workshop held on April 9–13, 2018, in Mainz, Germany, with the goal to develop a medium-term strategy of analyses and calculations aimed at solving the puzzles. Lattice and continuum theorists working together with experimentalists have discussed how to reshape the semileptonic analyses in view of the much higher luminosity expected at Belle II, searching for ways to systematically validate the theoretical predictions in both exclusive and inclusive B decays, and to exploit the rich possibilities at LHCb.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Davies, Professor Christine
Authors: Gambino, P., Kronfeld, A. S., Rotondo, M., Schwanda, C., Bernlochner, F., Bharucha, A., Bozzi, C., Calvi, M., Cao, L., Ciezarek, G., Davies, C. T. H., El-Khadra, A. X., Hashimoto, S., Jung, M., Khodjamirian, A., Ligeti, Z., Lunghi, E., Lüth, V., Mannel, T., Meinel, S., Paz, G., Schacht, S., Simula, S., Sutcliffe, W., and Vaquero Avilés-Casco, A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:European Physical Journal C
Publisher:Springer
ISSN:1434-6044
ISSN (Online):1434-6052
Published Online:19 October 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in European Physical Journal C 80(10): 966
Publisher Policy:Reproduced under a Creative Commons License

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