Prospects for $B_c^+$ and $B^+\to τ^+ ν_τ$ at FCC-ee
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866909202374459392 |
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| author | Fedele, Marco Helsens, Clément Hill, Donal Iguro, Syuhei Klute, Markus Zuo, Xunwu |
| author_facet | Fedele, Marco Helsens, Clément Hill, Donal Iguro, Syuhei Klute, Markus Zuo, Xunwu |
| contents | The prospects are presented for precise measurements of the branching ratios of the purely leptonic $B_c^+ \to τ^+ ν_τ$ and $B^+ \to τ^+ ν_τ$ decays at the Future Circular Collider (FCC). This work is focused on the hadronic $τ^{+} \to π^+ π^+ π^- \barν_τ$ decay in both $B_c^+ \to τ^+ ν_τ$ and $B^+ \to τ^+ ν_τ$ 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 $B^+ \to τ^+ ν_τ$ decay can be well separated from both $B_c^+ \to τ^+ ν_τ$ 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 $B^+ \to τ^+ ν_τ$ and $B_c^+ \to τ^+ ν_τ$ measurements on New Physics cases are discussed for interpretations in the generic Two-Higgs-doublet model and leptoquark models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_02998 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Prospects for $B_c^+$ and $B^+\to τ^+ ν_τ$ at FCC-ee Fedele, Marco Helsens, Clément Hill, Donal Iguro, Syuhei Klute, Markus Zuo, Xunwu High Energy Physics - Experiment High Energy Physics - Phenomenology The prospects are presented for precise measurements of the branching ratios of the purely leptonic $B_c^+ \to τ^+ ν_τ$ and $B^+ \to τ^+ ν_τ$ decays at the Future Circular Collider (FCC). This work is focused on the hadronic $τ^{+} \to π^+ π^+ π^- \barν_τ$ decay in both $B_c^+ \to τ^+ ν_τ$ and $B^+ \to τ^+ ν_τ$ 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 $B^+ \to τ^+ ν_τ$ decay can be well separated from both $B_c^+ \to τ^+ ν_τ$ 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 $B^+ \to τ^+ ν_τ$ and $B_c^+ \to τ^+ ν_τ$ measurements on New Physics cases are discussed for interpretations in the generic Two-Higgs-doublet model and leptoquark models. |
| title | Prospects for $B_c^+$ and $B^+\to τ^+ ν_τ$ at FCC-ee |
| topic | High Energy Physics - Experiment High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2305.02998 |