TY - JOUR
T1 - Challenges in semileptonic B decays
AU - Gambino, P.
AU - Kronfeld, A. S.
AU - Rotondo, M.
AU - Schwanda, C.
AU - Bernlochner, F.
AU - Bharucha, A.
AU - Bozzi, C.
AU - Calvi, M.
AU - Cao, L.
AU - Ciezarek, G.
AU - Davies, C. T.H.
AU - El-Khadra, A. X.
AU - Hashimoto, S.
AU - Jung, M.
AU - Khodjamirian, A.
AU - Ligeti, Z.
AU - Lunghi, E.
AU - Lüth, V.
AU - Mannel, T.
AU - Meinel, S.
AU - Paz, G.
AU - Schacht, S.
AU - Simula, S.
AU - Sutcliffe, W.
AU - Avilés-Casco, A. Vaquero
N1 - Funding Information:
This work was supported by the Mainz Institute for Theoretical Physics (MITP) of the Cluster of Excellence PRISMA+ (Project ID 39083149) which hosted the workshop. We acknowledge the friendly effectiveness of its staff and thank the scientific coordinator Tobias Hurth and director Matthias Neubert for their encouragement. We are grateful to G. Caria, B. Dey, A. Greljo, B. Grinstein, N. Gubernari, G. Herdoiza, Y. Kwon, H. Meyer, R. Laha, W. Lee, P. Owen, S. Stefkova, P. Urquijo, who also participated in the workshop. F. Bernlochner and L. Cao were supported by the DFG Emmy-Noether Grant No. BE 6075/1-1. C. Davies was supported by the UK Science and Technology Facilities Council. A. El-Khadra was supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics under Award Number DE-SC0015655 and by the Fermilab Distinguished Scholars Program. P. Gambino and M. Jung were supported by the Italian Ministry of Research (MIUR) under grant PRIN 20172LNEEZ. S. Hashimoto was supported by JSPS KAK- ENHI Grant Number JP26247043 and by the Post-K and Fugaku supercomputer project through the Joint Institute for Computational Fundamental Science (JICFuS). The work of A. Khodjamirian and T. Mannel was supported by the DFG (German Research Foundation) under Grant 396021762–TRR 257 “Particle Physics Phenomenology after the Higgs Discovery”. Z. Ligeti was supported in part by the Office of High Energy Physics of the U.S. Department of Energy under contract DE-AC02-05CH11231. S. Meinel was supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics under Award Number DE-SC0009913. G. Paz was supported by the U.S. Department of Energy grant DE-SC0007983 and by a Career Development Chair award from Wayne State University. S. Schacht was supported by a DFG Forschungsstipendium under contract No. SCHA 2125/1-1. A. Vaquero was supported by the U.S. National Science Foundation under grants PHY14-14614 and PHY17-19626. This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U. S. Department of Energy, Office of Science, Office of High Energy Physics.
Publisher Copyright:
© 2020, The Author(s).
PY - 2020/10/1
Y1 - 2020/10/1
N2 - 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.
AB - 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.
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U2 - 10.1140/epjc/s10052-020-08490-x
DO - 10.1140/epjc/s10052-020-08490-x
M3 - Review article
AN - SCOPUS:85092795454
SN - 1434-6044
VL - 80
JO - European Physical Journal C
JF - European Physical Journal C
IS - 10
M1 - 966
ER -