تقرير
Prospects for $B_c^+$ and $B^+\to \tau^+ \nu_\tau$ at FCC-ee
| العنوان: | Prospects for $B_c^+$ and $B^+\to \tau^+ \nu_\tau$ at FCC-ee |
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| المؤلفون: | Fedele, Marco, Helsens, Clément, Hill, Donal, Iguro, Syuhei, Klute, Markus, Zuo, Xunwu |
| المصدر: | Eur. Phys. J. C 84, 87 (2024) |
| سنة النشر: | 2023 |
| المجموعة: | High Energy Physics - Experiment High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | High Energy Physics - Experiment, High Energy Physics - Phenomenology |
| الوصف: | The prospects are presented for precise measurements of the branching ratios of the purely leptonic $B_c^+ \to \tau^+ \nu_\tau$ and $B^+ \to \tau^+ \nu_\tau$ decays at the Future Circular Collider (FCC). This work is focused on the hadronic $\tau^{+} \to \pi^+ \pi^+ \pi^- \bar{\nu}_\tau$ decay in both $B_c^+ \to \tau^+ \nu_\tau$ and $B^+ \to \tau^+ \nu_\tau$ 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 $B^+ \to \tau^+ \nu_\tau$ decay can be well separated from both $B_c^+ \to \tau^+ \nu_\tau$ and generic $Z\to b\bar{b}$ processes in the FCC-ee collision environment and proposes the corresponding branching ratio measurement as a novel way to determine the CKM matrix element $|V_{ub}|$. The theoretical impacts of both $B^+ \to \tau^+ \nu_\tau$ and $B_c^+ \to \tau^+ \nu_\tau$ measurements on New Physics cases are discussed for interpretations in the generic Two-Higgs-doublet model and leptoquark models. Comment: 39 pages, 19 figures, 5 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1140/epjc/s10052-024-12418-0 |
| URL الوصول: | http://arxiv.org/abs/2305.02998 |
| رقم الأكسشن: | edsarx.2305.02998 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1140/epjc/s10052-024-12418-0 |
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