Abstract
We perform a detailed model-independent phenomenological analysis of \( \overline{B}\to \overline{D}D \) decays. Employing an SU(3)F analysis including symmetry-breaking contributions together with a conservative power counting for various suppression effects, we obtain updated Standard Model predictions for all branching fractions and CP asymmetries from a fit to the available experimental data, testable at Belle II and the LHC experiments. These results include all relevant suppressed contributions, thereby providing upper limits on subleading Standard Model (SM) effects like “penguin pollution”, enabling searches for physics beyond the SM. Importantly, allowing in the same fit for the production fractions of charged and neutral B mesons to be different, we find fd/fu = 0.86 ± 0.05, which is 2.5σ away from unity, which, if confirmed, would have important phenomenological consequences.
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Acknowledgments
J.D. is supported by the European Research Council under the starting grant Beauty2Charm 852642. The work of M.J. is supported in part by the Italian Ministry of University and Research (MUR) under grant PRIN 2022N4W8WR. S.S. is supported by a Stephen Hawking Fellowship from UKRI under reference EP/T01623X/1 and the STFC research grants ST/T001038/1 and ST/X00077X/1. For the purpose of open access, the authors have applied a Creative Commons Attribution (CC BY) licence to any Authors Accepted Manuscript version arising. This work uses existing data which is available at locations cited in the bibliography.
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Davies, J., Jung, M. & Schacht, S. \( \overline{B}\to \overline{D}D \) decays and the extraction of fd/fu at hadron colliders. J. High Energ. Phys. 2024, 191 (2024). https://doi.org/10.1007/JHEP01(2024)191
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DOI: https://doi.org/10.1007/JHEP01(2024)191