Report number
| arXiv:2305.02998 ; TTP23-015 ; P3H-23-28 |
Title
| Prospects for B+c and B+→τ+ντ at FCC-ee |
Author(s)
| Zuo, Xunwu (KIT, Karlsruhe, ETP) ; Fedele, Marco (KIT, Karlsruhe, TTP) ; Helsens, Clément (KIT, Karlsruhe ; Ecole Polytechnique, Lausanne ; CERN) ; Hill, Donal (Ecole Polytechnique, Lausanne) ; Iguro, Syuhei (KIT, Karlsruhe, TTP ; KIT, Karlsruhe, IAP) ; Klute, Markus (KIT, Karlsruhe) |
Publication
| 2024-01-26 |
Imprint
| 2023-05-04 |
Number of pages
| 28 |
Note
| 39 pages, 19 figures, 5 tables |
In:
| Eur. Phys. J. C 84 (2024) 87 |
DOI
| 10.1140/epjc/s10052-024-12418-0
|
Subject category
| hep-ph ; Particle Physics - Phenomenology ; hep-ex ; Particle Physics - Experiment |
Study
| CERN FCC |
Abstract
| The prospects are presented for precise measurements of the branching ratios of the purely leptonic B+c→τ+ντ and B+→τ+ντ decays at the Future Circular Collider (FCC). This work is focused on the hadronic τ+→π+π+π−¯ντ decay in both B+c→τ+ντ and B+→τ+ντ processes. Events are selected with two Boosted Decision Tree algorithms to optimise the separation between the two signal processes as well as the generic hadronic Z decay backgrounds. The range of the expected precision for both signals are evaluated in different scenarios of non-ideal background modelling. This paper demonstrates, for the first time, that the B+→τ+ντ decay can be well separated from both B+c→τ+ντ and generic Z→b¯b processes in the FCC-ee collision environment and proposes the corresponding branching ratio measurement as a novel way to determine the CKM matrix element |Vub|. The theoretical impacts of both B+→τ+ντ and B+c→τ+ντ measurements on New Physics cases are discussed for interpretations in the generic Two-Higgs-doublet model and leptoquark models. |
Copyright/License
| preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2024-2025 The Author(s) (License: CC-BY-4.0) |